2020 GMC Sierra 1500 engine problems

Related recalls

No recalls on file.

What owners say

1. Filed Oct 8, 2026COEngine

   I have a 2020 GMC Sierra 1500 AT4 with the L87 6.2L V8. The cam shaft and lifters have failed for a 2nd time. The first time happened in 2022. It was under warranty and happened at approximately 40,000 miles. This last time it happened in 2026 and was at 125,000 miles - both for the same thing - cam shaft and lifters. Both were sudden failures and luckily I was on a highway that wasn't buy at the time. This time it is costing me $10,000 to fix. They have had the truck for…

   NHTSA complaint #11769874 · source
2. Filed Oct 7, 2026NYEngine

   While driving down interstate noticed drop in oil pressure and immediately a noise in engine with loss of power. immediately took it to dealership and they diagnosed rod bearing failure. Gm refuses to pay for engine.

   NHTSA complaint #11769499 · source
3. Filed Oct 5, 2026NCEngine

   My 2020 GMC Sierra 1500 SLT with the 6.2L L87 engine experienced complete engine failure at approximately 129,000 miles. The vehicle is currently at Trent Cadillac GMC in New Bern, NC and is available for inspection upon request. The dealer confirmed the engine requires replacement along with timing-chain-related repairs, estimated at approximately $11,000. Before the failure, I had previously reported concerns involving oil pressure/engine operation to a Chevrolet dealer.…

   NHTSA complaint #11768916 · source
4. Filed Oct 2, 2026124,000 miNYEngine

   The contact owns a 2020 GMC Sierra 1500. The contact stated that while driving 74 MPH, the vehicle made a loud banging sound, reduced engine power, and was losing oil pressure. The dealer associated the failure with NHTSA Action Number: EA25007 (Engine, Engine and Engine Cooling). The dealer was contacted and the vehicle was diagnosed with rod bearing failure. The manufacturer was contacted by phone and made aware of the failure. The failure mileage was approximately 124,000.

   NHTSA complaint #11768586 · source
5. Filed Sep 30, 2026MAEngine

   The engine blew up driving down the road 5k miles past warranty. Complete junk and had to pay for a new one. They would only put in another defective 6.2 gmc engine and it will fail again

   NHTSA complaint #11768156 · source
6. Filed Sep 28, 2026AKElectrical SystemEngine

   6 months after owning it the lifters went bad got them Fixed then they immediately went bad again also bent rods then a day after getting that fixed again the oil pump went bad it was issue after issue

   NHTSA complaint #11767573 · source
7. Filed Sep 24, 2026CAEngine

   While slowly accelerating from a stop, with 4 family members in the truck, the engine began to run rough for about 1-2 seconds then multiple notifications flashed across the dashboard (Check Engine, Steering Assist is Reduced-Drive with Care, Service ESC, and Service Parking Brake). The road we were on was steep and twisty and did not have room to pull over which put us in an unsafe position with compromised steering and no shoulder. We made it 2 miles home but there was…

   NHTSA complaint #11766668 · source
8. Filed Sep 19, 2026NCEngineFuel, Hybrid & EV PropulsionOther / Unknown

   Vehicle: 2020 GMC Sierra 1500 SLT VIN: [VIN removed] Engine: 6.2L V8, RPO L87 Mileage: approximately 129,854 miles My 2020 GMC Sierra 1500 equipped with the L87 6.2L V8 experienced an engine failure and has been diagnosed as needing an engine replacement. I am reporting this because my vehicle is equipped with the same L87 6.2L engine currently being investigated by NHTSA under Engineering Analysis EA25007 for engine failures occurring outside the scope of Recall 25V-274. My…

   NHTSA complaint #11765481 · source
9. Filed Sep 15, 2026MSElectrical SystemEngineTransmission & Drivetrain

   5/5/25 woke up back seat entire truck flooring soaking wet back glass cracked. 4/8/25 transmission went out 117,000 miles 7/3/25 exhaust leak and placed nox 1. 7/8/25 127551 mileage exhaust leak replace gaskets, belt , tensioner, and pulley, 6/8/2025 3 knock sensors replaced and replaced intake manifold.

   NHTSA complaint #11764362 · source
10. Filed Sep 14, 2026115,000 miMNEngine

    The contact owns a 2020 GMC Sierra 1500. The contact stated that while driving approximately 55 MPH, the vehicle started losing power and decelerated. The check engine warning light was flashing with several unknown messages displayed. The vehicle was parked on the side of the road and later towed to the local dealer to be diagnosed. The contact was informed that the lifters, push rods, and camshaft had failed and needed to be replaced. The lifters, push rods, and camshaft…

    NHTSA complaint #11764134 · source
11. Filed Sep 9, 2026TXEngineTransmission & Drivetrain

    Powertrain issues and a chassis issue that is extremely dangerous.Tailgate on rare occasions falls open by itself. There is a design flaw in the placement of the catalytic converters. The heat is burning up the fluid. I could not believe my eyes when I serviced the transmission. This is another shortcut by GM to save on the extra wiring needed for the oxygen sensors (2)in the converters and the two oxygen sensors downstream of the converters. There is plenty of room for the…

    NHTSA complaint #11763015 · source
12. Filed Sep 9, 2026MIEngine

    I was driving home with my wife. The engine just cut off. No power to the gas pedal. Luckily we were able to coast long enough to find a shoulder to pull off onto. Truck wouldn’t restart. Had to call a tow truck and have it towed to the Chevy dealership. The engine was already repaired once. Ref number 11696129. I just got the truck back and fixed again. So far I’ve had to pay for 2 tows and 2 repairs costing be about 3000 dollars. Both repairs have been done at a Chevy…

    NHTSA complaint #11763011 · source

Source: U.S. National Highway Traffic Safety Administration (NHTSA) Office of Defects Investigation public data. Complaints are submitted by owners and are not verified by NHTSA or by us; a complaint does not prove a defect exists. View this vehicle on NHTSA.gov Methodology