Au7o mascotAu7o
Known IssuesTest Hub demo
  1. Au7o
  2. /
  3. Known Issues
  4. /
  5. GMC
  6. /
  7. Sierra 1500
GMC · Known Issues

2009 GMC Sierra 1500 Problems: 12 Known Issues

2009 model year · NHTSA recalls, manufacturer TSBs, and owner forum reports · Updated September 2026

Share:@au7o.io

2009 · All trims · All engines

Choose the year and equipment for your written issues and visual request.

Known IssuesMotorcycle IssuesDTC LookupDrivePricingAboutTermsPrivacyCookiesConsentData rightsCopyrightFeedback
Share:@au7o.io

Vehicle data and repair guidance on this site are compiled with AI assistance and may contain errors. Always verify with your service manual or a qualified mechanic.

Data protection representation

DataRep representative in the United KingdomDataRep representative in the European Union
Au7o · 2026
Built for DIY mechanics. Privacy-first.
Explore free Hub demo
No email neededHow interest is saved

Interest applies to the selected vehicle and configuration; it is not a reservation. Voting stores a first-party identifier for up to 180 days to prevent repeat votes. No account or email is needed. Clearing cookies or using another device may count separately. Privacy

Visual coming soon

Your interest helps us choose what to build next.

Visual Known Issues · Coming soon

$4.99/month plus taxes at launch · No payment today

Preview the XT6 example
Issue summary

According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2009 GMC Sierra 1500 has 12 documented known issues, with 2 rated critical. The most serious are P0016 — Crank/Cam Correlation Fault from Stretched Timing Chain on 5.3L AFM V8 ($150-$1,800 repair) and P0700 — Transmission Fault Flag from Failing 6L80/6L90 Internal TEHCM ($600-$2,500 repair). Across all issues with published estimates, repair costs range from $20 to $2,500. DIY maintenance guides at au7o.io.

In This Article

  • Sierra 1500 Engine2
  • Sierra 1500 Transmission1
  • Sierra 1500 Emissions4
  • Sierra 1500 Interior2
  • Sierra 1500 Electrical1
  • Sierra 1500 Suspension1
  • Sierra 1500 Cooling1
  • Recalls22
  • FAQ
Get Started
Back to top

In This Article

  • Engine2
  • Transmission1
  • Emissions4
  • Interior2
  • Electrical

All 12 Known Issues

NHTSA Recalls22 recalls

TIRES

General Motors LLC (GM) is recalling certain 2020 Buick Enclave, Cadillac XT4, XT5, Escalade, Escalade ESV, Chevrolet Suburban, Tahoe, Traverse, GMC Yukon, Yukon XL, 2018-2021 Chevrolet Express, GMC Savana, 2019-2020 Chevrolet Blazer, Silverado 1500, GMC Acadia, Sierra 1500, and certain Continental tires sold to the aftermarket for various model year 2018-2021 vehicles. The affected tires were cured for too long during production.

Campaign #21V11500025/02/2021

ELECTRICAL SYSTEM:12V/24V/48V BATTERY:CABLES

General Motors LLC (GM) is recalling certain 2019-2020 Chevrolet Silverado 1500 and GMC Sierra 1500 trucks. The battery positive (B+) cable rings may have been manufactured with excessive glue, potentially causing an intermittent electrical connection between the B+ cable and alternator.

Campaign #19V88800012/12/2019

SEAT BELTS

General Motors, LLC (GM) is recalling certain 2019-2021 Chevrolet Silverado 1500 and GMC Sierra 1500, 2021 Chevrolet Suburban and Tahoe and GMC Yukon XL and 2020-2021 Chevrolet Silverado 2500 and 3500 and GMC Sierra 2500 and 3500 vehicles. The seat belt brackets may not be secured to the seat frame in the front-row center seating position.

🔧
A mechanic who knows YOUR exact car
Answers tuned to your year, make, model & trim — not generic advice. Save your garage so it always has the right context.
Get ahead of GMC Sierra 1500 problems — free
Leave your email and we'll alert you the moment there's a new recall or known issue for your GMC Sierra 1500. Free, no account needed.

Don't see your problem? Describe your symptoms to get a diagnosis, or .

Other GMC Models

GMC Terrain26GMC Yukon XL24GMC Sierra 3500HD24GMC Acadia22GMC Yukon21GMC Canyon18

Frequently Asked Questions

What are the most common GMC Sierra 1500 problems?

According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2009 GMC Sierra 1500 has 12 documented issues. The most frequently reported are: P0016 — Crank/Cam Correlation Fault from Stretched Timing Chain on 5.3L AFM V8, P0700 — Transmission Fault Flag from Failing 6L80/6L90 Internal TEHCM, P0430 — Catalyst Efficiency Bank 2 (Driver-Side) Converter Failure on 5.3L V8. Of these, 2 are rated critical and should be addressed promptly.

Is the GMC Sierra 1500 reliable?

The 2009 GMC Sierra 1500 has 12 known issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. 2 issues are rated critical: P0016 — Crank/Cam Correlation Fault from Stretched Timing Chain on 5.3L AFM V8 and P0700 — Transmission Fault Flag from Failing 6L80/6L90 Internal TEHCM. Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.

How much does it cost to fix common GMC Sierra 1500 problems?

Repair costs for known GMC Sierra 1500 issues range from $20 to $2,500, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, P0016 — Crank/Cam Correlation Fault from Stretched Timing Chain on 5.3L AFM V8, typically costs $150-$1,800 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What is the 2007-2021 GMC Sierra 1500 P0016 — Crank/Cam Correlation Fault from Stretched Timing Chain on 5.3L AFM V8?

P0016 means the crankshaft and Bank 1 intake camshaft are out of sync beyond tolerance. On the 5.3L V8 Sierra 1500 this is a signature failure because of two engine-specific problems: (1) the timing chain stretches over time — accelerated by AFM lifter debris and extended oil-cha… Repairs typically run $150-$1,800. Severity: high.

What is the 2007-2018 GMC Sierra 1500 P0700 — Transmission Fault Flag from Failing 6L80/6L90 Internal TEHCM?

P0700 itself is only a flag: the Transmission Control Module has stored one or more transmission faults and is requesting the MIL. On Sierra 1500s with the 6L80 (and 6L90 on heavier variants) 6-speed automatic, the notable design issue is that the TCM is integrated into the valve… Repairs typically run $600-$2,500. Severity: high.

Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.

Data compiled from NHTSA recalls, manufacturer TSBs, automotive forums, and AI-assisted research. No aggregated owner-report counts available for this vehicle yet.

1
  • Suspension1
  • Cooling1
  • Recalls22
  • FAQ
  • Filter:
    ALL YEARS2026202520242023202220212020201920182017201620152014201320122011201020092008200720062005200420032002200120001999

    When Issues Typically Appear

    Upper Dash Pad Cracking and Interior Panel Failure in Sun-Exposed GMT800/GMT900 Trucks
    40K-150K
    Blend Door / HVAC Actuator Failure Causing Clicking Behind Dash and Incorrect Air Temperature or Mode
    50K-180K
    Front Hub Bearing Assembly Failure Causing ABS Activation, Noise, and Wheel Play
    60K-150K
    Power Door Lock Actuator Failure Causing Intermittent or Inoperative Locking
    70K-160K
    050K100K150K200K mi

    On the 2007-2021 GMC Sierra 1500, p0016 means the crankshaft and Bank 1 intake camshaft are out of sync beyond tolerance. On the 5.3L V8 Sierra 1500 this is a signature failure because of two engine-specific problems: (1) the timing chain stretches over time — accelerated by AFM lifter debris and extended oil-change intervals — retarding cam timing until correlation exceeds threshold; and (2) the cam actuator (VVT) solenoid or phaser sticks. The AFM V8s are also known for oil consumption, and low/dirty oil starves the phasers and clogs solenoid screens, which both triggers P0016 and worsens chain wear. This is more serious than the related P0011: a severely stretched chain can jump a tooth and cause piston-to-valve contact, so continued driving is risky.

    This issue also affects: Buick Cascada, Buick Enclave, Buick Encore

    Common Symptoms

    • Check engine light
    • Rough idle
    • Rattle from front of engine on cold start
    • Reduced power / poor fuel economy
    • Hard start or stalling in severe cases

    How to Fix

    Check oil level/condition first — low or sludged oil alone can set it. Use a scan tool to read cam-retard/phaser data. If the timing chain is stretched (confirmed by measuring cam retard or valve-cover inspection), replace the timing chain, guides, tensioner, and cam phaser/sprocket; if only the VVT solenoid is stuck, replace it. Address AFM oil consumption to prevent recurrence.

    What you need to diagnose it

    The repair instructions explicitly call for reading stored codes. Use a scanner that can read the named code families before choosing a repair.The recommended scanner supports these code families; confirm your exact year, model and module coverage before buying.

    • ANCEL AD310 Classic OBD-II Scanner

      Read & clear engine (P) codes

      $20–$40View

    As an Amazon Associate, we earn from qualifying purchases. Prices are approximate and may vary.

    Reading and clearing the code is DIY work. Module replacement or reprogramming is not — most modules are VIN-programmed, so a new one does nothing until a shop codes it to your car. Check for an open recall or service bulletin before buying anything.

    Typical repair cost:$150 - $1,800

    Research This Issue

    GoogleRedditYouTubeNHTSA
    Community Reported
    High ConfidenceVerifiedReviewed Jul 2026

    On the 2007-2022 GMC Sierra 1500, p0011 means the Bank 1 intake camshaft is timed more advanced than the ECM commanded — the phaser is stuck/biased advanced. On the Sierra 1500 5.3L/6.2L, the dominant cause is a VVT (camshaft actuator) solenoid whose internal screen has clogged with oil sludge or AFM debris, jamming the plunger so oil pressure to the phaser can't be modulated. GM acknowledges sticking/binding solenoids in PIs such as PIP5130K and PIP5855. Low or incorrect-viscosity oil is a very common trigger, so oil condition is always checked first. Because AFM lifter wear sheds metal into the oil, that debris circulates and clogs the solenoid screens — tying P0011 directly to the trucks' oil-consumption reputation. Drivers report rough running, and in worse cases stalling when slowing to a stop.

    This issue also affects: Cadillac XT5, Chevrolet Avalanche, Chevrolet Equinox

    Common Symptoms

    • Check engine light
    • Rough idle / rough running
    • Stalling when slowing to a stop
    • Hard start
    • Reduced power and fuel economy

    How to Fix

    Check engine oil level, viscosity, and condition first; an oil/filter change with correct-spec oil sometimes clears it. A proven test is swapping the Bank 1 intake solenoid with another solenoid — if the code follows to P0014/P0021, the solenoid is bad. Replace the VVT/cam actuator solenoid (roughly $40-$90 part). If the phaser or timing chain is worn, the timing set must be replaced.

    Typical repair cost:$40 - $450

    Research This Issue

    GoogleRedditYouTubeNHTSA
    Community Reported
    High ConfidenceVerifiedReviewed Jul 2026

    On the 2007-2018 GMC Sierra 1500, p0700 itself is only a flag: the Transmission Control Module has stored one or more transmission faults and is requesting the MIL. On Sierra 1500s with the 6L80 (and 6L90 on heavier variants) 6-speed automatic, the notable design issue is that the TCM is integrated into the valve body as a TEHCM (transmission electro-hydraulic control module), bolted inside the pan and sitting in 180-250°F fluid. Repeated heat cycling degrades the module and its integrated pressure switches and solenoids. When the TEHCM or a shift/pressure-control solenoid begins to fail, it sets specific sub-codes (e.g., P2534, P0742, P0761) plus the umbrella P0700, and the truck can exhibit harsh or missed shifts, slipping, or limp mode. Critically, on the 6L80/6L90 the solenoids are over-molded into the non-serviceable TEHCM and generally can't be replaced individually.

    This issue also affects: Buick Encore GX, Buick Envision, Cadillac CT6

    Common Symptoms

    • Check engine light with transmission sub-codes
    • Harsh or delayed shifts
    • Slipping
    • Loss of gears / limp mode
    • Torque converter shudder

    How to Fix

    P0700 alone is not actionable — pull the transmission-specific sub-codes with a capable scanner to find the real fault. Check fluid level/condition first. Repairs commonly involve replacing the TEHCM/valve body assembly (solenoids are integrated and non-serviceable) and re-learning shift adaptives; the new TEHCM must be programmed to the VIN. Address any fluid overheating cause to prevent recurrence.

    Typical repair cost:$600 - $2,500

    Research This Issue

    GoogleRedditYouTubeNHTSA
    Community Reported
    High ConfidenceVerifiedReviewed Jul 2026

    On the 2007-2018 GMC Sierra 1500, p0430 is the Bank 2 counterpart to P0420 and, on the Sierra 1500 V8, points to the driver-side (Bank 2) catalytic converter falling below efficiency threshold. The mechanism is identical to Bank 1: the rear O2 sensor voltage begins mirroring the front sensor, so the ECM concludes that bank's cat can no longer store/release oxygen. The specific pattern on these trucks is that the underlying killer is usually AFM-related oil consumption or a lazy/aged rear O2 sensor rather than a defective converter out of the box. Owners commonly report P0430 (or both P0420 and P0430) returning even after installing new aftermarket converters — a well-documented frustration on GM-Trucks and SilveradoSierra forums — because the root cause (oil burning, exhaust leak, or a slow O2 sensor) was never corrected.

    This issue also affects: Chevrolet Cruze, Chevrolet Equinox, Chevrolet Silverado 2500HD

    Common Symptoms

    • Check engine light
    • Poor fuel economy
    • Sulfur smell from exhaust
    • Code returns after aftermarket cat replacement
    • Minimal drivability change early

    How to Fix

    Confirm with a smoke/leak check and O2 sensor live-data (rear sensor should be lazy/flat, not switching). Rule out driver-side manifold bolt leaks. Replace a lazy Bank 2 rear O2 sensor first if indicated. If the converter is confirmed inefficient, fit an OEM/CARB-compliant direct-fit unit and fix any oil consumption; expect aftermarket cats to re-trigger if the AFM oil burn persists.

    Typical repair cost:$400 - $1,500

    Research This Issue

    GoogleRedditYouTubeNHTSA
    Community Reported
    High ConfidenceVerifiedReviewed Jul 2026

    On the 2007-2017 GMC Sierra 1500, on the 5.3L V8 Sierra 1500, P0420 sets when the downstream (post-cat) O2 sensor tracks the upstream sensor too closely, meaning the Bank 1 catalytic converter is no longer scrubbing exhaust efficiently. The distinctive part on these trucks: the converter frequently dies prematurely from an upstream cause rather than age. Active Fuel Management (AFM) V8s burn oil past the lifters/rings, and that oil ash slowly poisons the catalyst substrate. GM TSB #16-NA-111 also documents a lesser-known trigger: a poor air-filter-housing seal lets abrasive dirt bypass the filter, wearing the O2 sensors and clogging the cat from the inside. Broken exhaust manifold bolts (a chronic GM V8 issue) create leaks that mimic P0420. Aftermarket cats have a poor track record here and often re-trigger the code within months.

    This issue also affects: Chevrolet Cruze, Chevrolet Equinox, Chevrolet Silverado 1500

    Common Symptoms

    • Check engine light on
    • Reduced fuel economy
    • Rotten-egg/sulfur exhaust smell
    • Occasional lack of power
    • No obvious drivability change in early stages

    How to Fix

    Do not blindly replace the converter. First scan for exhaust leaks (check manifold bolts), inspect the air-filter housing per TSB 16-NA-111, and check upstream/downstream O2 sensor operation with live data. Address AFM oil consumption if present. If the converter is genuinely spent, install an OEM or high-quality direct-fit unit and complete the heat-cycle break-in before the monitor re-runs.

    Typical repair cost:$400 - $1,500

    Research This Issue

    GoogleRedditYouTubeNHTSA
    Community Reported
    High ConfidenceVerifiedReviewed Jul 2026

    On the 2007-2018 GMC Sierra 1500, p0442 on the Sierra 1500 is a small EVAP leak detected during the ECM's key-off/idle vacuum test. On these trucks the two most common real-world causes are a loose, worn, or cracked gas cap seal (the cheapest fix and always the first check) and — a documented GM issue (TSB 15-NA-019) — the fuel tank filler vent hose connector cracking, which allows vapor to escape and sets P0442 (and sometimes P0455). The vent hose fracture is addressed by replacing the vent hose assembly (part No. 22802073 on 2013-2015 models). The EVAP purge valve (engine bay) and vent solenoid (near the tank) can also weep. Drivers often notice a faint fuel odor and the CEL, with no drivability change.

    This issue also affects: Chevrolet Corvette, Chevrolet Express, Chevrolet Silverado 1500

    Common Symptoms

    • Check engine light
    • Faint fuel/gasoline odor
    • No drivability change
    • Occasional failed emissions test

    How to Fix

    Start with the gas cap — inspect the seal and tighten/replace with OEM. If the code persists, perform a smoke test to pinpoint the leak; inspect the fuel filler vent hose connector for cracks and replace the vent hose assembly if fractured. Replace the purge or vent solenoid if the smoke test isolates it there.

    Typical repair cost:$20 - $250

    Research This Issue

    GoogleRedditYouTubeNHTSA
    Community Reported
    High ConfidenceVerifiedReviewed Jul 2026

    On the 2007-2023 GMC Sierra 1500, p0455 indicates a large (gross) EVAP leak — the ECM cannot pull or hold vacuum in the evaporative system at all. On the Sierra 1500 the classic causes are a completely missing/unsealed gas cap, a stuck-open or failed EVAP vent solenoid (mounted under the truck near the fuel tank/spare tire, where it's exposed to road spray, dirt, and corrosion), and a cracked or disconnected vapor/vent hose. Because the vent solenoid sits at the canister under the bed, water intrusion and corrosion cause it to stick open, which the ECM reads as a wide-open system; a tell-tale symptom is the fuel nozzle repeatedly clicking off during refueling. The filler vent hose connector fracture noted in GM literature can also escalate to P0455. Symptom-wise the driver usually sees only the CEL, sometimes a fuel smell, and no performance loss.

    This issue also affects: Chevrolet Corvette, Chevrolet Express, Chevrolet Silverado 1500

    Common Symptoms

    • Check engine light
    • Fuel vapor smell
    • Missing or loose gas cap
    • Fuel nozzle clicks off repeatedly when refueling
    • Fails emissions test

    How to Fix

    Confirm the gas cap is present and sealing. Smoke-test the EVAP system to find the large leak. The most common repair on these trucks is replacing the under-body EVAP vent solenoid/valve at the canister; also inspect and replace cracked vapor lines and the fuel filler vent hose. Clear codes and run the EVAP monitor to confirm.

    Typical repair cost:$20 - $350

    Research This Issue

    GoogleRedditYouTubeNHTSA
    Community Reported
    High ConfidenceVerifiedReviewed Jul 2026

    On the 2000-2013 GMC Sierra 1500, 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.

    This issue also affects: Chevrolet Equinox, Cadillac DeVille, Chevrolet Silverado 1500

    Common Symptoms

    • clicking behind dash
    • air only blows from defrost
    • temperature stuck hot or cold
    • driver and passenger temperatures do not match
    • mode changes do not respond
    • recirculation door inoperative

    How to Fix

    Diagnosis is done by commanding HVAC modes and temperatures while listening for actuator chatter and verifying door movement with a scan tool or visual inspection where accessible. Repair involves replacing the failed mode, blend, or recirculation actuator and then performing HVAC recalibration by fuse pull or scan-tool procedure depending on year and system configuration.

    Typical repair cost:$150 - $700

    Research This Issue

    GoogleRedditYouTubeNHTSA
    Community Reported
    High Confidence

    On the 2007-2013 GMC Sierra 1500, 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.

    Common Symptoms

    • cracked dashboard
    • rattles from dash area
    • broken plastic near passenger airbag
    • sun-damaged interior trim
    • loose dash pieces

    How to Fix

    Inspect for cracks around the passenger-side airbag opening, center speaker area, and defrost vent corners. Repair options include replacing the dash pad, installing a molded dash cap, or using plastic repair methods for minor cracks; replacement is the most durable but also the most labor-intensive and expensive option.

    Typical repair cost:$120 - $1,200

    Research This Issue

    GoogleRedditYouTubeNHTSA
    Community Reported
    Medium Confidence

    On the 2007-2013 GMC Sierra 1500, 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.

    Common Symptoms

    • door will not lock or unlock with key fob
    • weak buzzing from inside door
    • intermittent power lock operation
    • one or more doors stuck locked
    • manual lock works but power lock does not

    How to Fix

    Diagnosis involves confirming power and ground at the latch/actuator assembly and ruling out broken door-jamb wiring or BCM command issues. The usual fix is replacement of the failed actuator or latch-actuator assembly in the affected door, followed by checking all doors because multiple actuators often fail within a similar time period.

    Typical repair cost:$180 - $500

    Research This Issue

    GoogleRedditYouTubeNHTSA
    Community Reported
    High Confidence

    On the 1999-2013 GMC Sierra 1500, 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.

    This issue also affects: Chevrolet Avalanche, Chevrolet Blazer, Chevrolet Colorado

    Common Symptoms

    • humming or growling from front end
    • noise increases with vehicle speed
    • wheel play or looseness
    • ABS light on
    • traction control warning
    • low-speed ABS activation

    How to Fix

    Diagnosis involves checking for wheel play with the tire off the ground, listening for bearing noise during road tests, and comparing wheel speed sensor data if ABS symptoms are present. Repair is replacement of the affected hub assembly, and many owners replace both sides if mileage is high. Corrosion at the sensor mounting surfaces and wiring damage should also be addressed to prevent repeat ABS issues.

    Typical repair cost:$300 - $900

    Research This Issue

    GoogleRedditYouTubeNHTSA
    Community Reported
    High Confidence

    On the 2007-2019 GMC Sierra 1500, on the Sierra 1500, P0128 means the coolant did not reach the expected regulating temperature within the time/airflow the ECM predicted — almost always a thermostat stuck open (or partly open) so the engine runs too cool. The GM thermostat on the 5.3L/6.2L is integrated into a plastic housing on the engine, and the common failure is the thermostat losing its ability to close, letting coolant circulate continuously. Drivers notice the temp gauge sitting low, weak or slow-to-warm cabin heat (especially in winter), and worse fuel economy because the ECM stays in open-loop enrichment longer. A stuck-open thermostat is by far the most frequent cause; a failed/biased coolant temperature sensor is the secondary suspect and should be verified with live data before parts are thrown at it.

    This issue also affects: Buick Encore GX, Cadillac Allante, Cadillac Catera

    Common Symptoms

    • Temp gauge reads low / below normal
    • Weak or slow cabin heat
    • Reduced fuel economy
    • Check engine light
    • Longer engine warm-up

    How to Fix

    Verify actual coolant temperature with a scan tool vs. the gauge to separate a bad ECT sensor from a bad thermostat. If the engine won't reach ~195-210°F, replace the thermostat (and housing/gasket, commonly sold as an assembly) with an OEM-spec unit and refill/bleed the cooling system. Replace the ECT sensor if data shows an implausible reading.

    What you need to fix it

    Only diagnosis- and fitment-reviewed repair parts are linked here.

    • Engine Coolant Thermostat
      Cross-refTHRGM-0002

      Fitment confirmed against the ShowMeTheParts catalog for this vehicle's year and engine.

      eBay

    As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.

    Typical repair cost:$200 - $850

    Research This Issue

    GoogleRedditYouTubeNHTSA
    Community Reported
    High ConfidenceVerifiedReviewed Jul 2026
    Campaign #20V79200017/12/2020

    TIRES

    General Motors LLC (GM) is recalling certain 2020 Buick Enclave, Cadillac XT5, GMC Acadia and Chevrolet Traverse vehicles and 2020-2021 Chevrolet Silverado 1500, GMC Sierra 1500 vehicles. The vehicles may have been manufactured with Continental tires that were overcured.

    Campaign #20V68400005/11/2020

    AIR BAGS:SIDE/WINDOW:CURTAIN:INFLATOR

    General Motors, LLC. (GM) is recalling certain 2020 Buick Enclave, Cadillac XT5 and XT6, Chevrolet Blazer, Silverado 1500, 2500 and 3500 and Traverse and GMC Acadia and Sierra 1500, 2500 and 3500 vehicles. The diffuser component of the Roof-Rail Air Bag (RRAB) inflator may not have been properly crimped to the inflator and could separate from the inflator during air bag deployment.

    Campaign #20V44600030/07/2020

    + 17 more recalls. Check all on NHTSA.gov

    Enter your VIN at NHTSA.gov to check recalls specific to your vehicle.

    get a full repair guide

    What is the 2007-2018 GMC Sierra 1500 P0430 — Catalyst Efficiency Bank 2 (Driver-Side) Converter Failure on 5.3L V8?

    P0430 is the Bank 2 counterpart to P0420 and, on the Sierra 1500 V8, points to the driver-side (Bank 2) catalytic converter falling below efficiency threshold. The mechanism is identical to Bank 1: the rear O2 sensor voltage begins mirroring the front sensor, so the ECM concludes… Repairs typically run $400-$1,500. Severity: medium.

    What is the 2007-2013 GMC Sierra 1500 Power Door Lock Actuator Failure Causing Intermittent or Inoperative Locking?

    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 oper… Repairs typically run $180-$500. Severity: medium.

    What is the 2007-2022 GMC Sierra 1500 P0011 — Intake Cam Over-Advanced from Sludge-Clogged VVT Solenoid on 5.3L V8?

    P0011 means the Bank 1 intake camshaft is timed more advanced than the ECM commanded — the phaser is stuck/biased advanced. On the Sierra 1500 5.3L/6.2L, the dominant cause is a VVT (camshaft actuator) solenoid whose internal screen has clogged with oil sludge or AFM debris, jamm… Repairs typically run $40-$450. Severity: medium.

    What is the 1999-2013 GMC Sierra 1500 Front Hub Bearing Assembly Failure Causing ABS Activation, Noise, and Wheel Play?

    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 o… Repairs typically run $300-$900. Severity: medium.

    What is the 2000-2013 GMC Sierra 1500 Blend Door / HVAC Actuator Failure Causing Clicking Behind Dash and Incorrect Air Temperature or Mode?

    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… Repairs typically run $150-$700. Severity: medium.

    What is the 2007-2017 GMC Sierra 1500 P0420 — Catalyst Efficiency Bank 1 from Failing Cat, Often Caused by AFM Oil Consumption or Air-Box Debris?

    On the 5.3L V8 Sierra 1500, P0420 sets when the downstream (post-cat) O2 sensor tracks the upstream sensor too closely, meaning the Bank 1 catalytic converter is no longer scrubbing exhaust efficiently. The distinctive part on these trucks: the converter frequently dies premature… Repairs typically run $400-$1,500. Severity: medium.

    What is the 2007-2019 GMC Sierra 1500 P0128 — Engine Never Reaches Operating Temp from a Stuck-Open Thermostat?

    On the Sierra 1500, P0128 means the coolant did not reach the expected regulating temperature within the time/airflow the ECM predicted — almost always a thermostat stuck open (or partly open) so the engine runs too cool. The GM thermostat on the 5.3L/6.2L is integrated into a pl… Repairs typically run $200-$850. Severity: low.

    What is the 2007-2018 GMC Sierra 1500 P0442 — Small EVAP Leak from Loose/Cracked Gas Cap or Fractured Filler Vent Hose?

    P0442 on the Sierra 1500 is a small EVAP leak detected during the ECM's key-off/idle vacuum test. On these trucks the two most common real-world causes are a loose, worn, or cracked gas cap seal (the cheapest fix and always the first check) and — a documented GM issue (TSB 15-NA-… Repairs typically run $20-$250. Severity: low.

    What is the 2007-2013 GMC Sierra 1500 Upper Dash Pad Cracking and Interior Panel Failure in Sun-Exposed GMT800/GMT900 Trucks?

    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… Repairs typically run $120-$1,200. Severity: low.

    What is the 2007-2023 GMC Sierra 1500 P0455 — Gross EVAP Leak from Failed Vent Solenoid, Missing Gas Cap, or Broken Vent Hose?

    P0455 indicates a large (gross) EVAP leak — the ECM cannot pull or hold vacuum in the evaporative system at all. On the Sierra 1500 the classic causes are a completely missing/unsealed gas cap, a stuck-open or failed EVAP vent solenoid (mounted under the truck near the fuel tank/… Repairs typically run $20-$350. Severity: low.