1999-2026 GMC Sierra 1500 Problems: 35 Known Issues

The 8L90 8-speed and 10L80/10L90 10-speed automatic transmissions experience shuddering during light throttle acceleration, particularly at highway speeds between 35-60 mph. The issue is caused by the torque converter lock-up clutch slipping and chattering. Harsh shifts between gears, especially 1st to 2nd and 2nd to 1st, are also commonly reported.

2024-2025 Sierra 1500 trucks with the 10-speed automatic (5.3L L84, 6.2L L87 and 3.0L Duramax LZ0) are failing at very low mileage with a stuck valve-body solenoid. Symptoms: a 'Service Transmission' or 'Service Transmission — Unable to Shift Soon' message, sudden hard/slamming shifts, slipping, complete loss of reverse (owners have had to push the truck out of parking spaces), and default limp operation limited to fifth gear and reverse. Several complaints report the failure occurring under 7,000 miles. NHTSA reports cite DTC P2818 (pressure control solenoid) and P0747/P0700. The situation is compounded by a national valve-body backorder — owners document 50-plus days and in some cases over a year waiting for the part, with GM sometimes authorizing a full transmission replacement instead. At least 14 NHTSA complaints for the 2024 model year describe this failure, for example ODI numbers 11756150 and 11754176.

GM explains that P0700 stored in the engine controller accompanies a transmission-controller concern and another diagnostic code. P0700 alone does not identify a failed transmission module or justify replacing the engine controller. 2014 GMC Sierra gasoline LV3, L83 and L86 configurations covered by PIP5109C. This guidance does not establish a heat-related TEHCM defect, failure rate or repair on other model years.

On GMT800 Sierra 1500 trucks equipped with the 4L60-E family automatic, a well-known internal failure is cracking or stripping of the reaction sun shell. Owners commonly report sudden loss of reverse, 2nd gear and 4th gear after a bang or flare, while 1st and 3rd still work. This is widely documented in transmission rebuild literature, repair databases, and owner reports for GM trucks and SUVs using this transmission.

GM found that if a wheel-speed sensor fails, incorrect axle-ratio calibration in the electronic brake control module (EBCM) can activate the driveline-protection system while driving 41-60 mph in four-wheel drive or Auto mode, braking the wheel on the opposite side and pulling the truck to one side. The ABS and stability-control lamps and a "Service StabiliTrak" message come on when the sensor fails. 2014-2018 GMC Sierra 1500 with four-wheel drive, the 5.3L V8 (RPO L83) and a 3.08 rear axle (RPO GU4), per GM's Part 573 report for recall 19V761 (GM N192261050). Two-wheel-drive trucks and other engine/axle combinations are not included.

GM found that the engine-mounted mechanical vacuum pump's output may decrease over time, reducing power brake assist. GM says debris such as oil sludge can build up on the pump's oil filter screen; drivers may notice increased pedal effort, a hard pedal or a longer stopping distance, and a "Service Brake Assist" message appears 2-5 minutes after vacuum drops. 2014-2018 GMC Sierra 1500 built September 3, 2013 to August 31, 2017 with the affected vacuum pump design, per GM's Part 573 report for recall 19V645 (GM N192268490). Check the VIN.

Corrosion of steel brake lines is a major safety issue on older Sierra 1500 trucks, especially in salt-belt states. Owners report the brake pedal suddenly dropping to the floor when a rusted line bursts during normal braking, often near the ABS module or along the frame rails. The problem is heavily documented in NHTSA complaints and repair forums for GMT800 trucks and related GM full-size pickups.

GM says a misfire, tick noise and check-engine light with P0300 may be caused by an Active Fuel Management lifter that is mechanically collapsed or stuck, internal locking-pin damage from oil aeration, a lifter collapsed and stuck in its bore, or a bent pushrod. 2014 GMC Sierra 1500, 2015-2018 GMC Sierra and 2019 GMC Sierra Limited with the 5.3L V8 (L83) or 6.2L V8 (L86), per GM bulletin 15-06-01-002O (March 2023). The 4.3L V6 is not listed.

GM recalled 2021-2024 Sierra 1500 trucks equipped with the 6.2L L87 V8 because manufacturing defects in the connecting rods and/or crankshaft can cause bearing seizure and catastrophic engine failure. Owners in NHTSA reports describe a knocking or grinding noise developing over days or weeks, then a violent shudder, a bang, and total loss of power — several at highway speed in traffic, some with the engine catching fire. Failures are reported as low as 7,500-22,000 miles. This is by far the dominant complaint theme for the 2024 Sierra 1500: engine-related reports account for roughly half of all filings for the model year. Complaint ODI numbers include 11700648, 11649398, 11680361, 11637614 and many more.

GM tells technicians that the camshaft position actuator solenoid valve may stick or bind, holding the valve timing retarded, which can cause an intermittent crank-no-start with code P0011 and/or P00C6 stored. GM says the engine may sound like it is cranking fast and fuel rail pressure may read low while cranking. 2014-2019 GMC Sierra with the 4.3L V6 (LV3), 5.3L V8 (L83) or 6.2L V8 (L86), per GM preliminary information PIP5130K.

GM says major carbon build-up on the intake and/or exhaust valves, from fuel contamination or incomplete burning of the fuel, can cause rough idle, extended crank, crank-no-start or misfire with codes P0300-P0308, and that valves may stick. 2014-2018 GMC Sierra 1500 gasoline engines (4.3L V6, 5.3L V8, 6.2L V8); GM bulletin 16-NA-383 (June 2024) covers all 2000-2025 GM gasoline passenger cars and light/medium-duty trucks.

The 4.8L, 5.3L, and 6.0L Vortec engines used in early GMT800 Sierra trucks place the knock sensors in wells beneath the intake manifold, where water can collect and corrode the sensors or harness. Owners frequently report recurring check-engine lights, timing retard, and reduced power, especially after washing the engine bay or driving in wet conditions. GM issued service information addressing knock sensor corrosion and revised sealing practices.

GM told technicians that on the 2014 Sierra 1500 with the 4.3L V6, service-manual diagnosis may not find the cause of a hard P0016, and that the crankshaft reluctor wheel may be damaged, misaligned or moved on the crankshaft. 2014 GMC Sierra 1500 with the 4.3L V6 (RPO LV3), per GM preliminary information PIP5183. Not the 5.3L or 6.2L V8.

GM found that an electrical signal short may cause the automatic transfer case to switch to neutral without driver input, while the mode knob still shows the last mode. While moving, the truck loses drive power; parked without the parking brake set, it can roll. 2014 GMC Sierra 1500 and some 2015 GMC Sierra with the Automatic Transfer Case (RPO NQH), per GM recall bulletin 14192 (NHTSA 14V374).

GM recalled certain 2026 Sierra 1500 trucks built with four-wheel drive or all-wheel drive because a component was omitted from the drivetrain transfer case during assembly. The omission can allow the front and/or rear wheels to lock up suddenly, with no warning to the driver — a loss-of-control event at any speed. NHTSA campaign 26V289000 (GM internal number N262557620) was filed May 7, 2026 and carries a DO NOT DRIVE advisory, which GM issues only for the most severe defects. The same campaign covers 2026 Silverado 1500, Suburban, Tahoe, Yukon, Yukon XL, Escalade and Escalade ESV, plus certain 2015-2020 full-size SUVs. This is a build/assembly defect, not a wear item, so an affected truck can fail at delivery mileage.

A common GMT800 Sierra problem is failure of the in-tank fuel pump module, often from worn pump motors or failed level-sender/module electronics. Owners report long crank, hard starting, loss of power under load, or sudden stall/no-start conditions, especially as mileage climbs. This issue is widely documented in owner forums and complaint databases across 4.3L, 4.8L, 5.3L, and 6.0L trucks.

A very common GMT800 complaint is sulfur contamination and wear of the fuel level sensor contacts inside the tank module, causing the gauge to read empty, full, or fluctuate unpredictably. Owners often see a low-fuel warning with plenty of fuel in the tank or watch the gauge drop suddenly while driving. GM offered special coverage for premature fuel level sensor wear on some 2005-2007 midsize SUVs (Envoy, TrailBlazer, Rainier, SSR), but that program does not include the Sierra.

Owners of 2024-2025 Sierra 1500 trucks report the factory rear-view camera image is effectively black in any unlit area. In daylight the picture is sharp; at night the LED reverse lamps are aimed too high and are too dim to light the ground behind the truck, so the camera sensor sees almost nothing beyond a foot or two. NHTSA complaints describe only the red guideline overlay being visible and an adult standing 3-5 ft behind the truck being lit at chest level (a child or a bicycle is invisible). Dealers repeatedly tell owners the system is 'operating as designed' after checking it in a lit service bay. This is separate from the intermittent black-screen/camera-module dropout fault — here the camera works, but there is no light for it to work with. Complaint ODI numbers include 11703585, 11685671, 11658856, 11648167, 11645362, 11629474, 11627444, 11622143, 11620997, 11614888, 11610906, 11608202, 11601046, 11570814 (2024) and 11707086, 11693732, 11678658, 11664238, 11663238, 11634151 (2025).

2024-2025 Sierra 1500 owners report the forward collision / automatic emergency braking system commanding hard braking with nothing in the travel lane. Documented triggers include a vehicle legally parked on the shoulder while the truck was travelling 55 mph (speed dropped to about 30 mph with no prior alert), overtaking a tractor-trailer at 70+ mph on a divided highway, and low-speed manoeuvring in parking lots. Some trucks display a persistent 'Service Driver Assist System' message alongside the false activations, and others show the opposite failure — AEB not intervening when it should. Rear-end collision exposure is the obvious risk. Complaint ODI numbers include 11705288, 11729845, 11661333, 11616606, 11629735, 11726911 (2024) and 11748748, 11695954 (2025).

2024-2025 Sierra 1500 owners report the power MultiPro tailgate unlatching and falling open on its own, most often while driving, after hitting a bump or rain gutter, or after a car wash. Nobody presses the release; several owners returned to the truck to find the gate resting against a garage door. Documented consequences in NHTSA reports include the tailgate striking a towed trailer's jack on a left turn, cargo falling out onto the roadway, and repeated cosmetic damage to the top edge of the gate. Forum diagnosis points to water entering through two drain holes in the handle cavity and shorting the tailgate release switch, which is why the fault is strongly weather-correlated. GM recalled 2020-2024 Sierra 2500/3500 HD trucks (NHTSA 24V-060) for water shorting the tailgate release switch but has not extended coverage to the 1500, and owners report their VINs falling outside the campaign. Complaint ODI numbers include 11681958, 11657356, 11642113, 11637129, 11632101, 11631949, 11591659, 11581039 (2024) and 11670408 (2025).

The infotainment system experiences intermittent complete audio loss affecting stereo, turn signals, and safety warning sounds. The audio system may randomly go to maximum volume and cannot be controlled. OTA software updates have caused additional issues including erratic blinker tones, constant reboots while driving, and frozen camera screens.

GMT900 Sierra trucks are well known for failing door lock actuators, often starting with one door that unlocks weakly or only works intermittently before additional doors fail. Owners report the key fob cycling the locks while one or more doors remain stuck, requiring manual operation from inside. The issue is heavily documented across GM full-size truck forums and complaint records.

2003-2007 GMT800 Sierra trucks (including the 2007 Classic) are well known for instrument cluster gauge failures caused by defective stepper motors and, in some cases, backlighting issues. Speedometer, tachometer, oil pressure, fuel, voltage, and coolant gauges can stick, read wildly high or low, or stop moving entirely. The problem became widespread enough that GM issued a special coverage adjustment on many trucks and SUVs using the same cluster design.

Distinct from the night-visibility complaint, 2024-2025 Sierra 1500 owners report the entire camera suite — rear, front, side-mirror and bird's-eye surround views — cutting out intermittently and displaying a black screen with crossed-out camera icons. The pattern owners describe is thermal: the cameras work when the truck is cold and after it has sat, then fail once the vehicle has been running or driven for a while, pointing at the Video Processing Module / Image Processing Module. Gridline overlays also drop out independently. Repeat dealer visits are common (one owner reported five visits and a full infotainment replacement without resolution, another reported three unsuccessful repair attempts); at least one report describes a garage-door collision when the display went blank while reversing. Complaint ODI numbers include 11746275, 11721762, 11693556, 11620174 (2024) and 11684291 (2025).

A recurring 2025 Sierra 1500 electrical fault kills every audio output in the cabin at once. Owners start the truck and there is no radio, no turn-signal tick, no chime for hazard flashers, no Apple CarPlay audio, and — critically — no audible forward-collision, rear-cross-traffic or lane-departure warning. The cabin is completely silent. The condition is intermittent, appears at start-up, and can persist for hours; a restart sometimes clears it. Because the visual and audible warning channels are decoupled, a driver can be unaware the alerts are muted until a warning is needed. Owners report repeated dealer repair attempts without resolution.

GM says sand or debris can enter the air filter box and bypass a poorly sealing air filter, damaging the oxygen sensor element and blocking the catalytic converter with sand and debris particles, which turns on the check-engine light with P0420 and/or P0430. 2014-2018 GMC Sierra with the L83 5.3L V8, L86 6.2L V8 or LV1/LV3 4.3L V6, per GM bulletin 16-NA-111 (March 2019 version).

GM says sand or debris can enter the air filter box and bypass a poorly sealing air filter, damaging the oxygen sensor element and blocking the catalytic converter with sand and debris particles, which turns on the check-engine light with P0420 and/or P0430. 2014-2018 GMC Sierra with the L83 5.3L V8, L86 6.2L V8 or LV1/LV3 4.3L V6, per GM bulletin 16-NA-111 (March 2019 version).

GM says a strong fuel odor during fueling or at idle, with possible P0442 or P0455, may be caused by a fracture of the gasoline filler neck recirculation (vent) line connector. 2014-2015 GMC Sierra 1500 except Regular Cab, per GM bulletin 15-NA-019 (December 2015).

GM says dirt, dust or water drawn into the EVAP canister vent solenoid (CVS) valve's fresh-air intake can restrict airflow or corrode the valve, turning on the check-engine light with P0442, P0446, P0455 or P0449 and making the fuel tank hard to fill. 2014 GMC Sierra 1500 and 2015 GMC Sierra, per GM bulletin 15-06-04-002 (April 2015).

GM describes warm A/C and very low or empty refrigerant when a small crack or pinhole forms at the first bend of the compressor-to-condenser line. Oil and refrigerant on the compressor can make the leak source hard to identify; this is not evidence that the compressor itself failed. 2014 GMC Sierra 1500 and early-built 2015 trucks with the muffler-equipped compressor-to-condenser line, per PIT5331. Confirm the installed line and use the vehicle-specific service procedure. The later owner/lawsuit citations are retained as historical context, not proof of compressor failure or the bulletin repair on every vehicle.

GM identifies a P0128 diagnostic that can run at the wrong time and falsely set the code, illuminating the malfunction indicator light. This source does not establish a stuck thermostat on earlier Sierra generations. 2019–2020 GMC Sierra 1500 New Model with the 4.3L LV3 gasoline engine, North America. Not the 2014 L83 representative truck. Bulletin20-NA-167 supersedes PIP5685.

Sierra owners across both GMT800 and GMT900 generations frequently report small electric HVAC actuators stripping internal gears or losing calibration. The result is a repetitive clicking or tapping noise from the dash, air stuck on defrost or floor, or one side blowing hot while the other blows cold. This is one of the most common non-drivetrain complaints on these trucks and is heavily documented in owner forums and repair databases.

Owners of 2007-2013 Sierra 1500 trucks commonly report the upper dash cracking near the passenger airbag area and around defrost vents, especially in hot climates. While primarily a cosmetic and rattling issue, some owners also complain that broken plastic edges and loose pieces worsen over time. The problem is widely discussed in owner communities for GMT900 GM trucks and appears repeatedly in complaint databases.

Front wheel hub bearing assemblies on Sierra 1500 trucks commonly wear out, especially on 4WD models and trucks used with larger tires or in rough conditions. Owners report humming or growling that changes with speed, looseness in the front wheel, and in some cases ABS warnings or low-speed ABS activation because the wheel speed sensor is integrated into the hub. This is a frequent repair item across both GMT800 and GMT900 generations.

GM tells technicians that a grind, pop, shudder or bind felt or heard in the steering column when turning can come from the lower column bearing housing being out of position, or from the upper intermediate steering shaft-to-column bolt and nut contacting the shifter cable bracket. 2014 GMC Sierra 1500 and 2015 GMC Sierra with the tilt and telescoping steering column (RPO N37 or N38), per GM preliminary information PIT5312B.