1982, 1984-2026 Chevrolet Corvette Problems & Issues

Some 2014–2019 Corvette LT1/LT4 engines can develop a tick and misfire associated with AFM lifter or pushrod faults. GM bulletin 15-06-01-002L addresses diagnosis and repair. Other faults can cause similar symptoms, so confirm the diagnosis first.

The C6 Z06 (2006-2013) uses the LS7 7.0L V8 with titanium intake valves and aggressive valve springs. The valve guides (most often on the intake side) wear prematurely, allowing valves to cock sideways, break valve springs, and drop valves into cylinders. A dropped valve usually destroys the engine. The issue is most common on 2006-2008 models but can affect all LS7s. GM never issued a recall or a published warranty extension; some heads and engines were replaced under the original warranty, and a 2015 owner class action (Pilgrim v. GM) was filed over the guide wear. The titanium intake valves and sodium-filled exhaust valves are unique to the LS7.

A damaged crankshaft thrust bearing allows excessive crankshaft endplay on both the LT1 and LT4. The symptom set differs by transmission, which is why it is often misdiagnosed. On manual cars owners report engine stalling, clutch chatter, and hard shifting into first gear or reverse - all of which get blamed on the clutch or the TR6070 gearbox. On automatic cars it shows up as a vibration on launch and a clunk or noise from the engine. GM bulletin 19-NA-217 identifies the root cause as excessive crankshaft endplay from a damaged thrust bearing, and specifies the endplay window as 0.0015-0.0086 inch. Because the failure is at the crankshaft, replacing clutches, flywheels or torque converters does not fix it and owners can spend thousands chasing the wrong part.

A cluster of 2023 Corvette Z06 cars suffered catastrophic LT6 engine failures at extraordinarily low mileage — documented cases at 52 miles and at 621 miles, both during or immediately after the factory break-in period and both on cars driven gently (one showed an 18.7 mph lifetime average speed). Symptoms were sudden rattling or knocking from the mid-mounted 5.5L V8, in one case accompanied by thick white smoke and an OnStar alert flagging the engine and transmission system. Owners and dealers pointed to a spun rod bearing and bent rod; the white-smoke case also raised a cracked head or block. Notably, during LT6 development GM's own engine team identified hot spots in the main bearings attributed to oil cavitation near redline once oil thinned at high temperature, which is consistent with a bearing-lubrication failure mode. GM replaced the failed engines under warranty but blocked dealers from tearing them down, sending the cores back to Detroit for internal analysis instead. There is no recall and no public root-cause statement, so this remains an owner-borne risk rather than a fixed defect.

On 2016-2019 LT1 and LT4 engines, coolant migrates into the combustion chambers from two casting defects: pinhole porosity at the cylinder liner-to-deck-face casting, and a compromised casting line inside the intake port of the cylinder head. Symptoms are white smoke and a sweet coolant smell from the exhaust for an extended period after a cold start, a rough-running condition once warm, and gradual unexplained coolant loss with no external leak. Diagnostic trouble codes P050D (cold start rough idle) and P0300 may set, with misfire counts concentrated on one cylinder and occurring only on startup. Because there is no puddle under the car and no obvious head gasket failure, owners typically chase spark plugs, coils and injectors first. A companion bulletin (PIP5330B) covers the related case where coolant weeps at the outer head bolts.

GM has placed the 5.5L twin-turbo LT7 in the 2025-2026 Corvette ZR1 - and the naturally aspirated 5.5L LT6 in the 2023-2026 Z06 - on a Technical Assistance Center part restriction, published as #PIP6089 and highlighted in GM TechLink. A part restriction means a dealer cannot simply order a replacement engine: when diagnosing a possible engine failure the technician must gather the information required by PIP6089, including the engine part number stamped on the center of the front cover, and open a case with TAC before an engine is released. GM frames this as continuous improvement, but the stated cause on the restriction is 'possible engine failure,' and the January 2026 update to PIP6089 adds instructions for handling catastrophic failure cases and intake manifold transfer, which indicates real field failures are being worked.

The LT1 (and 1996 LT4) uses a front-of-engine 'Opti-Spark' optical distributor mounted low behind the water pump, driven off the camshaft. It is highly vulnerable to moisture, heat, and ozone. The 1992-1993 units were completely unvented and are notorious for internal condensation and corrosion of the optical sensor disc. The leading real-world cause of failure is a leaking water pump directly above it dripping coolant onto/into the unit, but ordinary humidity and age also kill them. It is one of the single most defining reliability weak points of the 1992-1996 C4.

A defective supplier batch of valve springs went into GM V8 engines built between June 1 and September 15, 2020, including the 6.2L LT2 in the C8 Stingray. Springs broke at astonishingly low mileage — documented C8 failures at 57 miles and at 115 miles, one of which required a flatbed tow. A broken spring drops valve control on that cylinder, producing a misfire, an audible tapping or clattering engine noise, a check engine light, and in the worst case valve-to-piston contact that destroys the head or the engine. GM acknowledged the defect in service bulletin PIP5752A on September 22, 2020, covering seven V8 families (L87, LT1, LT2, LT4, L82, L84, L8T). Owners subsequently reported failures on engines built past the September 15 cutoff, and GM extended the affected build window, so the published date range should be treated as a floor rather than a boundary. This is a discrete supplier defect and is unrelated to the LT2's lifter-tick and DFM behavior.

GM released Bulletin #25-NA-239, 'Malfunction Indicator Lamp (MIL) Illuminated - DTC P222B and/or P227B Set,' with fitment limited to 2025 Corvette models equipped with the 5.5L twin-turbo LT7 - that is, the ZR1 only. Both codes are barometric pressure sensor range/performance codes (P222B is Barometric Pressure Sensor 'B' Range/Performance), which on a turbocharged engine with more than one pressure sensor flag a reading that does not agree with the others. Because the bulletin is engine-code specific, this fault cannot occur on the naturally aspirated LT6 Z06, the LT2 Stingray, or the E-Ray.

GM bulletin 01-06-01-023A addresses higher than expected oil consumption on 1999-2002 Corvettes with the 5.7L LS1 or LS6, which it describes as in the range of 400-600 miles per quart. GM says the cause may be an interaction between the piston rings and cylinder bore in engines frequently or consistently run above 3,200 rpm, typically manual-transmission cars; on the LS6 only, the PCV baffle may not be properly sealed to the engine valley cover, letting oil into the PCV system.

Owners report the two-piece crankshaft harmonic balancer (crank pulley) wobbling as the rubber between its inner and outer sections degrades, sometimes with belt chirping or squeaking. Owners say a balancer whose two sections have separated or slipped needs replacing. It affects the C5 Corvette (1997-2004) with the 5.7L LS1 V8. The owner reports linked here come from 1999, 2000 and 2002 C5 owners; none is from a 2003-2004 car or an LS6 (Z06), and no GM bulletin or recall for this condition on the C5 was found. One linked owner report puts it at 35,000 miles on a 2000.

The LS1's press-on harmonic balancer uses a rubber isolator ring between the hub and outer pulley. With age and heat the rubber separates, letting the outer ring wobble and slip. Early symptom is a faint chirp at idle before a visible wobble develops. If ignored the balancer can walk forward on the crank snout, throw the serpentine belt, damage accessories, and in severe cases contribute to crankshaft damage. Enthusiasts note the degradation is time-driven, not just mileage-driven.

2023 Corvette Z06 models with the 5.5L LT6 flat-plane-crank V8 developed a loud, irregular ticking, tapping, or snapping noise from the top of the engine. The LT6 uses a solid mechanical valvetrain with no hydraulic lash adjusters, so a light, periodic mechanical tick is normal — but affected cars produce an excessive, non-periodic tick most audible at idle with the rear hatch open in Tour mode as the engine reaches operating temperature. GM traced the condition to misalignment of the camshaft caps, effectively an assembly-line camshaft cap bolt torque/seating error. GM issued Technical Service Bulletin 23-NA-115 in June 2023 with no VIN breakpoints, meaning any 2023-built LT6 can be affected. This is distinct from the LT2 lifter/DFM tick on the Stingray — the LT6 has neither hydraulic lifters nor cylinder deactivation, so no Stingray fix applies here.

The C8 Corvette uses the LT2 6.2L V8 with Dynamic Fuel Management (DFM) which can deactivate any combination of cylinders. While the LT2 is generally reliable, some owners report lifter tick similar to the AFM issues on truck engines. The DFM system uses the same collapsible lifter technology. GM bulletin #19-NA-218 (Ticking Noise from the Engine) covers the 2020-2021 LT2 and attributes cold-start tick to a lifter that has not pumped up with oil. The tick is most noticeable on cold starts and usually disappears when warm. Severe cases may require lifter replacement.

The C6 Z06 (LS7) and ZR1 (LS9) use a dry sump oil system with an external oil tank and scavenge pump. The oil tank can develop internal baffle failure, and the scavenge pump lines can leak at fittings. The dry sump system is more complex than the wet sump in base C6 models. Oil level must be checked differently (engine warmed to 175°F, then shut off and checked 5-15 minutes later). Overfilling or underfilling can cause issues. Some owners report oil starvation during sustained high-G cornering despite the dry sump design.

GM released Bulletin #24-NA-165, 'Malfunction Indicator Lamp (MIL) Illuminated - DTC P08ED Set,' with fitment limited to the 2024 Corvette E-Ray. The narrow single-year, single-trim scope indicates an early-build issue on the first model year of the hybrid powertrain rather than a C8-wide condition, so the code should be diagnosed against the E-Ray-specific bulletin and not a generic Corvette procedure.

GM released Bulletin #25-NA-284, 'Information on DTCs P2632 and/or P2634 Found During a GDS 2 Scan for Another Concern,' with fitment limited to 2025 model year Corvettes equipped with the 5.5L twin-turbo LT7 - the ZR1. The bulletin's framing matters: these codes turn up as stored history codes while a technician is scanning for an unrelated complaint, which is exactly the situation where an aftermarket shop tends to sell an unnecessary repair. This is a diagnostic-information bulletin for the LT7 fuel/pump control DTC block, not a repair authorization.

GM recalled 2023-2026 Corvettes built with a left-side radiator/fan combination because excess fuel can spill into the fuel-filler pocket during refueling and drain onto an ignition source. On affected cars the filler pocket sits above the left-side radiator and its cooling fan, so fuel that leaks from the pocket onto the radiator while the fan runs can be drawn through it and vaporized into the engine compartment, where it can reach an ignition source. NHTSA received a complaint from a 2023 owner describing exactly this outcome: as the fuel nozzle was pulled from the vehicle a violent explosion occurred and the owner was immediately engulfed in a fireball. Owner notification letters for recall 25V536000 went out November 14, 2025. Because the recall is keyed to a specific radiator/fan configuration rather than a build date range, VIN lookup is the only reliable way to know whether a given car is included.

The ZR-1's DOHC LT5 uses 16 fuel injectors (primary and secondary sets), and the original Rochester Multec units from this era are known to fail — coil windings short and drop resistance, and the early 1990-1992 injectors were designed before widespread ethanol-blended fuel, which degrades them further. Because the engine runs mostly on its primary injectors, failures show up as rough idle, stumbling, and misfires that diagnosis often traces to multiple dead or leaking injectors. Replacement is costly since the plenum must come off and ZR-1 specialists commonly find several failed injectors at once.

The C7 uses a saddle-style twin fuel tank. On 2014-2017 cars, cracks develop on the top surface of the left-hand fuel tank's primary fuel pump module flange, allowing liquid fuel and vapor to escape. Owners report a strong fuel smell - most obvious after parking a full car in a closed garage - and in worse cases fuel dripping onto the ground beneath the left rear of the car. The flange sits on top of the tank, so the leak is invisible without lifting the car, and the smell is often blamed on the evaporative system or the filler neck. Because the leak point is above the fuel level, the odor and drip typically appear when the tank is more than half full, and a check engine light may set when the level drops below half. This is a fire risk and GM established Special Coverage 17469 with unusually long terms - 10 years or 120,000 miles from the in-service date, regardless of ownership.

GM issued NHTSA recall 25V536 (GM number N252514930) covering 2025-2026 Corvette ZR1 with the twin-turbo 5.5L LT7 and 2023-2026 Corvette Z06 with the 5.5L LT6, about 23,656 vehicles in total. On these cars excess fuel can spill into the fuel-filler pocket during refueling and drain onto an ignition source - the left-side radiator/fan package unique to the LT6/LT7 cooling layout, whose fans can run even with the engine off, plus hot brake rotors - creating a fire risk. Fitment is defined by that left-side radiator/fan combination: the Corvette Stingray and the E-Ray do not have it and are not covered by this recall. GM also placed a stop-sale on unsold 2025-2026 Z06 and ZR1 units, and only 108 ZR1s were affected in the initial 2025 population.

The C6 Corvette does not use a single fuel tank. Because the rear transaxle and torque tube run down the centerline of the car, the fuel is carried in two connected saddle tanks straddling the driveline, and each tank carries its own level sender. The driver-side tank holds the fuel pump module and the primary sender; the passenger-side tank holds the secondary sender (Sensor 'B'), which is the one P2067 reports on. The secondary sender is a wiper arm riding on a printed resistive card, and it is the resistive card and its contact surface that fail. Two mechanisms are documented by C5/C6 owners. The first is contamination: sulfur and ethanol residue in pump gasoline plate a film onto the contact track, and once the wiper starts skipping across a corroded or scored section of the card the ECM sees the signal collapse toward ground. The second is plain mechanical wear — the wiper cuts a groove into the card at the fuel levels the car spends most of its life at, and once it wears through the circuit reads as a short. Either way the signal voltage on the Sensor 'B' circuit drops below roughly 0.2 V and holds there, and the PCM sets P2067. Owners describe the gauge dropping to empty immediately after a fill-up, a 'Low Fuel' and 'Service Fuel System' message on the DIC, the range-to-empty readout going blank or nonsensical, and a check engine light that returns within a drive cycle or two of being cleared. Because the fault is contact-related rather than a hard open, it is often intermittent at first, appearing at one particular fuel level and then clearing as the float moves past the bad spot on the card, before eventually becoming permanent. Note that the wrong-year replacement sender is a genuine trap here: the resistance range specified for the sender changed during the C6 run, so a brand-new but incorrectly catalogued sender can leave the gauge reading wrong and the code still set. Owners also correlate which tank is at fault with when the gauge misbehaves, since the passenger-side tank is emptied first, its fuel transferred continuously to the driver-side tank where the pump sits.

Essentially every C4-generation Corvette (built 1984-1996) eventually needs its in-tank electric fuel pump. A high-pitched whine from behind the seats is the classic early warning. In-tank connectors become brittle and corroded (adding resistance and overworking the new pump), and the fuel-level sending unit float/rheostat fails, giving inaccurate fuel readings. Ethanol-blend fuels sitting in these older systems accelerate the damage; the original strainer 'sock' also clogs with age.

The L83 Cross-Fire engine (fitted to the 1982 and 1984 Corvette) uses twin throttle-body injectors managed by an early ECM with a single O2 sensor and one idle-air control circuit for two IAC valves, so the two throttle bodies easily fall out of sync. Throttle shafts ride directly in the soft aluminum housings and wear, intake manifolds leak, and the system is highly sensitive to a failing coolant temperature sensor and oil pressure switch. Owners see surging or rough idle, hesitation, stalling once warmed up, and rich running that modern shops often struggle to diagnose.

C4 fuel level sending units are a long-standing failure item: corrosion forms where the resistive winding is grounded through a spring, the wiper develops open spots, or the float hangs up against the tank's inner wall. The gauge then sticks on full or empty, jumps erratically, or throws off the trip computer's range display. Owners can unexpectedly run out of fuel, which also risks overheating the in-tank electric fuel pump.

The C6 Corvette carries its fuel in two saddle-shaped tanks that straddle the driveline tunnel, each with its own level sender. The left tank holds the fuel pump module and its sender is Fuel Level Sensor 'A'; the right tank has a passive sender, Fuel Level Sensor 'B', and its fuel is siphoned across to the pump side. Because the right tank is drawn down first, the 'B' float and its resistor card spend much of the car's life sitting in vapor rather than submerged in gasoline, and owners report the code appearing most often when the car is driven hard on less than half a tank. That dry-wiping is what kills them: the wiper arm scrubs a dead spot or a high-resistance band into the resistive card, so the sender's output stops tracking fuel actually being burned. The PCM compares the two senders and the fuel actually consumed, and when the 'B' signal is present but not credible it sets P2066 rather than a hard open/short code such as P2067 or P2068. Owners typically describe a gauge that reads correctly on a fresh fill, then hangs at a fixed value for many miles before dropping abruptly, a Driver Information Center range-to-empty figure that goes nonsensical, and in some cases a gauge the cluster disables outright. The condition is not mechanically dangerous, but it strands owners who trust the gauge, and a stored MIL will block emissions readiness. Note that P2066 on this platform can also be provoked by a weak siphon jet pump that leaves the right tank unequally full, so the fuel level of both sides should be compared before condemning the sender.

GM recalled 2020 C8 Corvettes because the driver's seat belt retractor may not lock as intended during a crash. The retractor's locking mechanism is what arrests the occupant against the belt in a collision; if it does not engage, the driver continues forward into the airbag and steering wheel with far more travel than the restraint system is designed to allow. NHTSA identified the consequence as increased injury risk if the driver's restraint fails to engage during a collision. This defect is silent — the belt operates normally in everyday use and gives no indication that it will not lock under crash loading, which is why VIN verification matters more here than symptom-watching. Dealer remedy for campaign 20V581000 began October 15, 2020.

GM recalled certain 2024-2025 C8 Corvettes because the driver and/or passenger seat belt retractor can lock while the belt is fully stowed, leaving the webbing unable to be pulled out and the restraint effectively unusable. Unlike a retractor that fails to lock in a crash, this failure is obvious to the occupant — the belt simply will not extend — but the safety consequence is that an occupant may drive without a functioning restraint. NHTSA identified the consequence as heightened injury risk in a collision. Owner notification for campaign 24V418000 was mailed September 19, 2024. Note that this is a separate and opposite defect from the 2020 recall in which the driver's retractor could fail to lock during a crash.

GM recalled 2021 C8 Corvettes because the communications gateway module incorrectly processes a loss of communication with the sensing diagnostic module (SDM), the airbag control unit. The result is that the airbag malfunction indicator lamp illuminates inconsistently — it may light when nothing is wrong, and more importantly it may fail to light when there genuinely is an airbag system fault. NHTSA identified the consequence as the airbag warning lamp failing to warn the driver of a problem with the airbag, increasing injury risk. The defect is in module message handling rather than in the restraint hardware itself, so the airbags are not necessarily impaired; what is impaired is the driver's ability to know whether they are. Campaign number is 21V421000.

The LT1/LT4 mechanical water pump develops a front seal failure with age, allowing coolant to pass into a chamber that has no outlet except the bottom weep hole. Because the water pump sits directly above the Opti-Spark distributor, the dripping coolant frequently contaminates and destroys the distributor, turning a routine water pump job into a much larger repair. Coolant seeping from the weep hole is the classic warning sign.

C7 Z06 models with the supercharged 6.2L LT4 overheat and enter a reduced-engine-power mode when driven at sustained high speed on a road course in warm ambient temperatures. The factory cooling package is undersized for the LT4's heat rejection: the supercharger uses only two intercooler bricks, and the engine radiator, charge-air cooler circuit and oil cooler all saturate within a few minutes of hard lapping. Owners report having to pit and cool down mid-session, with the car noticeably slowing as the ECU pulls timing and then derates. GM formally acknowledged the condition with Special Coverage Adjustment N202302720, covering 2015-2016 Z06 with the MEK manual and 2015-2018 Z06 with the M5U 8-speed automatic. This is specific to the supercharged LT4 Z06 - the naturally aspirated LT1 Stingray and Grand Sport do not share this cooling deficit.

C4 cooling fans are relay-controlled and factory-programmed to switch on at very high coolant temperatures (around 230-238°F, set for emissions compliance), so any weakness in the fan relay or coolant temperature sensor quickly tips the car into overheating in traffic. Fan relays are a recognized common failure on these cars, and on 1992-1996 LT1 models the fan relays are commanded by the engine computer from the coolant temperature sensor, with the A/C able to force the secondary fan on. Chronic overheating risks head gasket damage and accelerates Opti-Spark failure on LT1 cars.

Some cars were built with lower control arm ball-stud nut and washer assemblies whose washers were made of the wrong steel. The washers may fracture and become loose or fall away, reducing clamp load, and the control arm ball stud can separate from the steering knuckle, possibly without prior warning. A separated front arm lets that corner drop and the wheel tilt outward and drag, pulling the car toward that side; a separation at the rear can push the rear of the car sideways and impair control of its direction; in extreme cases the wheel assembly could separate from the car. It affects certain 2004 Chevrolet Corvettes built January to April 2004, within GM's VIN breakpoints 45118579-45127798; GM's Part 573 report counts 8,849 Corvettes (the same recall also covers some 2004 Cadillac CTS, SRX and XLR). Only a Chevrolet dealer can confirm by VIN whether a car is included and whether the recall work was done.

The cast aluminum wheels fitted to the C7 Z06 (2015-2019) and Grand Sport (2017-2019) crack and deform under ordinary driving. Cracks initiate on the inner rim near the bead seat and propagate outward, producing a slow air leak that owners often first notice as a recurring low-tire warning. The wide rear wheels are the most frequently reported, and failures have been documented from as little as 3,000 miles, clustering around 15,000-25,000 miles. This is the single most-reported defect on the C7 in NHTSA data: 224 wheel complaints for the 2017 model year and 45 of 51 total complaints for 2018. Base Stingray cars on narrower wheels are far less affected, which is why the coverage program is written specifically around the Z06 and Grand Sport. GM never issued a safety recall, but after class-action litigation it established the Corvette Wheels Limited Special Reimbursement Program with an extended warranty of 4 years / 48,000 miles from the original warranty start date.

GM opened a service inspection program covering 2020-2021 C8 Corvettes fitted with the Open Spoke and Trident wheel designs after finding that exposed porosity in the aluminum wheel castings exceeded internal GM limits. The porosity presents as hairline cracking and allows air to weep through the casting, so the first thing an owner notices is a recurring low tire pressure warning on a wheel that holds no visible puncture. Roughly 13,049 U.S. cars were called in for inspection, with GM estimating about 10 percent actually carried the defect. The problem did not stop with the inspection program: NHTSA complaints on later cars describe a right rear wheel cracked at 23,000 miles with the owner noting it is a widely reported condition, and a 2024 owner reporting all four factory wheels found bent or deformed and recommended for replacement with no collision, pothole strike, or curb impact. The C8 runs low-profile rubber on wide cast rims with very little sidewall to absorb impact, which makes the inner barrel — where the casting is least supported — the usual failure point.

The electric power steering gear assembly on the 2017 C7 can fail without warning, dropping power assist while the car is being driven. Owners report the steering suddenly becoming very heavy, sometimes recovering only after the ignition is cycled. GM recalled the car twice for the same component: campaign 19V086000 (GM recall N182182760), with remedy beginning June 13, 2019, and again under campaign 25V175000 (GM recall N252497020), with owner notification beginning April 15, 2025. Both campaigns cover the same family of GM vehicles built around the Alpha/Y-body EPS gear, including the 2017 Camaro and Cadillac CTS/ATS. The loss of assist is most dangerous at low speed and during parking or tight maneuvers, where steering effort rises sharply.

The electronic column lock (ECL) locks the steering when the key is removed and unlocks it when the car is started. If the column fails to unlock, the fuel supply is designed to shut off when the driver tries to move the car, but with low or interrupted voltage at the powertrain control module the car can be accelerated while the steering is locked. Separately, during quick cranks the lock pin may not withdraw fully and, in cars with abnormally low clearance to the lock plate, can contact the plate, causing a ratcheting noise when the wheel is turned or a steering wheel that cannot be turned; GM states a crash could occur without warning. It affects 1997-2004 Corvettes with a manual transmission, 1997-2000 Corvettes with an automatic transmission, and 2001-2004 automatic Corvettes built for European export, within GM's VIN breakpoints (for 2004: 45100001-45120862). GM's Part 573 report states that automatic-transmission Corvettes sold in the US after the 2000 model year do not have an electronic column lock. Only a Chevrolet dealer can confirm by VIN whether a car is included and whether the recall work was done.

Early C5s use an electronic Column Lock mechanism as part of the anti-theft system (across the C5 run, GM fitted it to manual cars built 1997-2004 and automatics built 1997-2000). The mechanism and its electronics fail with age; when the column fails to unlock at key-on the PCM disables fuel and the car will not drive (or displays 'Service Column Lock'/'Pull Key, Wait Ten Seconds' on the DIC). In some cases the column can lock unexpectedly. It is one of the best-known early-C5 gremlins and is the subject of GM service bulletins and a recall/special policy.

A lighting control module software error introduced in October 2024 leaves 2025 and 2026 C8 Corvettes unable to detect and report a failed rear turn signal, which is an FMVSS noncompliance. The driver receives no telltale when a rear turn signal bulb or LED circuit stops working, so the car can be driven indefinitely signaling to nobody behind it. NHTSA identified the consequence as increased crash risk because the driver does not know the signal is out. What began as a quiet dealer stop-sale on roughly 3,300 cars expanded into NHTSA recall 26V213000 covering approximately 32,988 vehicles — effectively the entire 2025 and 2026 C8 population across Stingray, Z06, E-Ray and ZR1 variants. Owner notification is scheduled for May 18, 2026.

The 1984-1989 C4's all-digital LCD dash is a notorious failure point now that the electronics are decades old. Heat and vibration crack solder joints on the backlight board connectors and internal power supply, electrolytic capacitors age out, sunlight fades the LCD polarizing film, and the photocell dimmer degrades. The result is a cluster that goes dark, flickers random segments, or becomes unreadable in daylight, leaving the driver without speed, fuel, or temperature information.

The 1990-1996 C4 dash uses analog sweep gauges with a central digital LCD readout (the 1984-1989 cars were fully digital). With age the LCD can scramble into an unreadable mess, especially when the car hits bumps, which is characteristic of a ground/connection problem. Segments drop out, the display flickers, backlight bulbs fail, and the fuel-gauge/'FUEL RATE' readings become erratic. Heat, vibration, aged solder joints, and a degraded polarizer film are the root causes.

Owners of the mid-engine C8 Corvette have reported problems with the front trunk (frunk) latch mechanism. The electronic latch can fail to release or fail to secure properly. GM issued two 2020-model-year recalls for the front trunk: 20V489, because the car could be driven with the front trunk lid unlatched and the lid could then open at speed, and 20V461, because the interior front-trunk release button could stop working ten minutes after shutdown.

C8 owners across several model years report that the car's control modules do not enter sleep after shutdown, leaving the radio, infotainment screen and instrument cluster powered up with the vehicle off. The battery is drained overnight and the car will not restart.

GM released Bulletin #25-NA-056, 'No Start, Multiple Electrical System Concerns,' with fitment limited to the 2024 Corvette E-Ray. The E-Ray is the only Corvette that uses two lithium-ion batteries - a high-voltage pack for the front electric axle plus a 12-volt lithium-ion low-voltage battery with its own control module in place of the conventional lead-acid unit - and GM warns that the 12V lithium unit does not decay gradually like lead-acid but 'falls off sharply,' can be damaged above 14.5 volts, and permanently latches its contactors open if deeply discharged. That architecture is the plausible reason the no-start bulletin applies to the E-Ray alone.

GM released Bulletin #24-NA-273, 'Malfunction Indicator Lamp (MIL) Illuminated - DTC U01BE Set,' specifically for the 2024-2025 Corvette E-Ray. U01BE is a serial-data network communication code, and on the E-Ray the hybrid control network carries modules that no other Corvette has (battery energy control module, drive motor control module, front electric drive unit). The bulletin's fitment is limited to the E-Ray, so a shop diagnosing this code on an E-Ray should not fall back on generic C8 network diagnostics.

Stealth Mode (electric-only driving up to about 45 mph) and Shuttle Mode are the E-Ray's headline hybrid features, and owners frequently report the car refusing to enter them with an 'unavailable' message in the Driver Information Center. GM addressed this first with diagnostic tip #PIC6542 for the 2024 Corvette E-Ray, then superseded it with Bulletin #25-NA-374, 'Stealth and/or Shuttle Modes Unavailable,' covering 2024-2026 E-Ray (and ZR1X) models. In many cases the behavior is by design - the modes are gated by high-voltage battery state of charge, ambient temperature and accessory load - but GM's repeated republishing of the bulletin means a dealer should confirm whether the specific car meets the enabling conditions or has an actual fault before any parts are replaced.

GM recalled 2021-2022 C8 Corvettes because rear half-shaft assemblies may have left the supplier missing one or more ball bearings inside the joint. A half-shaft joint short of its complement of bearings cannot carry the torque this car makes; the joint fails and the affected rear wheel stops receiving drive. NHTSA classified the consequence as an unexpected loss of drive power that increases crash risk — on a 495-horsepower mid-engine car this can occur under load with no warning. This is an assembly defect present from new rather than a wear item, so the failure typically surfaces early in the vehicle's life. The campaign is NHTSA 22V091000.

The E-Ray's front axle is driven by an electric drive unit (RPO HP1) that contains a drive motor disconnect clutch and its actuator; the clutch decouples the front motor at higher speeds and re-engages it for eAWD launch and traction. GM released Bulletin #25-NA-266 covering all 2024-2026 Corvette E-Ray models for an illuminated MIL with DTC P2DE6 set for Drive Motor Clutch Actuator Performance. Because this component exists only in the E-Ray's front electric drive unit, the fault cannot occur on Stingray, Z06 or ZR1. GM has also published Bulletin #24-NA-118 describing available component-level repairs for the HP1 front electric drive unit, indicating the unit is serviceable rather than replace-only.

The C7 Corvette with the 7-speed manual or 8-speed automatic (the 8L90 automatic arrived for 2015; 2014 automatics used the 6L80 six-speed) can develop an annoying driveline vibration/shudder at low speeds, particularly during gentle acceleration from a stop. The 7-speed manual uses a dual-mass flywheel that can develop chatter. The 8-speed automatic (8L90) shares the torque converter shudder issue with GM trucks. The transaxle-mounted differential and half-shafts can also contribute to vibrations.

GM recalled 2020 C8 Corvettes after finding that sensor contamination inside the electronic brake boost (eBoost) module can interrupt communication within the braking system. The C8 uses an electronically boosted brake system rather than a conventional vacuum booster, so when the module drops out the driver loses power assist and must apply substantially higher pedal effort to stop the car. NHTSA identified the consequence as increased crash risk. Owner complaints filed against the 2020 car back this up in blunt terms, with one owner relaying another customer's report that his brakes did fail and it was difficult to stop. Notification and remedy for campaign 20V588000 began December 9, 2020.

Early C4s (notably 1986-1991) use a Bosch ABS Brake Pressure Modulator Valve (the ABS pump/accumulator assembly); 1990-1991 cars use an updated Bosch system (traction control did not arrive until 1992). These units fail with age and especially from sitting, and new replacements are effectively unobtainable while good used units are scarce and expensive. Failure typically illuminates the ABS warning lamp and disables anti-lock function (base hydraulic braking is retained).

The hold-down springs that retain the brake pads in the C4's calipers are known to snap in normal use, a problem documented by Haynes and European buyer's guides for the generation. A broken spring lets the pad shift and rattle in the caliper, causing vibration and noise under braking and uneven pad wear. It is cheap to fix but easy to misdiagnose as warped rotors.

The Tremec TR-9080 eight-speed dual-clutch transaxle (RPO M1L) fitted to every C8 has generated a sustained pattern of failures serious enough that GM formally notified NHTSA in November 2021 that it was investigating. The signature complaint is a 'Service Transmission' message that will not clear and that prevents the car from powering off — GM attributed this to debris on the park position sensor magnet feeding an incorrect position reading to the transmission control module. Beyond that, owners report DCT fluid leaks, DCT filters found heavily contaminated well before the 7,500-mile initial service, low-speed shudder during parking-lot maneuvers and 1-2 shifts on early 2020 cars, limp-mode entry, unexpected shifts into neutral while driving, and outright transmission replacement — one NHTSA complaint documents total transmission failure at 1,400 miles, another documents the rear transaxle case cracking and dumping fluid onto the exhaust. GM went so far as to bulletin dealers in November 2021 to collect and return every DCT filter removed at the 7,500-mile service for engineering analysis. The debris findings suggest internal wear material circulating in the unit, not merely a software calibration problem.

GM has documented a torque converter clutch shudder at steady speeds on some C7 Corvettes with the eight-speed automatic. The bulletin covers specific production ranges and regions, and a similar vibration is not always a converter problem.

On the E-Ray only, the 8-speed dual-clutch transmission carries an auxiliary fluid pump so the gearbox stays pressurized while the car is moving on electric power alone in Stealth or Shuttle mode. GM published Bulletin #25-NA-278 for 2024-2026 Corvette E-Ray models that display a Service Transmission message in the Driver Information Center along with an illuminated Check Engine MIL, with DTC P1955 (Transmission Fluid Pressure Relief Valve Performance) and/or P0867 (Transmission Fluid Pressure Performance) stored in the TCM. GM identifies the cause as auxiliary pump cavitation traced to the transmission pan fluid filter. This condition is specific to the hybrid E-Ray driveline and does not apply to the Stingray, Z06 or ZR1, which have no electric-only drive mode and no auxiliary pump duty cycle of this kind.

The C8 convertible uses a fully electric retractable hardtop driven by six electric motors and a set of latches, with no hydraulics. Owners report the top jamming partway through its cycle, failing to latch (most often at the right front), throwing a 'Service Convertible Top' or 'Top Not Secure' message, and the interior release button failing to actuate the roof at all. Because the roof is a motor-and-latch system rather than a hydraulic one, a single failed motor, a mis-set latch, or a module that has lost its position learn will stall the whole sequence and leave the car undriveable at speed with the top unsecured. The system also refuses to operate below its temperature thresholds by design, which owners frequently mistake for a failure.

C4 weatherstrip rubber hardens, shrinks, and cracks with age and UV exposure, and the removable targa roof panel relies entirely on these seals. Leaks are most common at the front corners where the windshield A-pillar, targa panel, and door glass meet, and at the lower corners of the rear hatch on coupes. The result is water dripping into the cabin, soaked carpet (which can damage electronics and breed mildew), wind noise, and drafts; a poorly adjusted top or cheap aftermarket rubber makes it worse.