The contact owns a 2020 Chevrolet Silverado. The contact received notification of NHTSA Campaign Number: 24V797000 (Power Train) however, the part to do the recall repair was not yet available. The local dealer was not contacted. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was made aware of the issue. The contact had…
2020 Chevrolet Silverado HD powertrain problems
severe 27 complaints filed with NHTSA · avg repair $2,500 · see powertrain across all vehicles →
Complaints
27
Recalls
0
Avg fix
$2,500
1crash
2injuries
When does it fail?
Of the 27 powertrain complaints filed for the 2020 Chevrolet Silverado HD, here's the actual mileage breakdown — failures cluster heaviest at 150,000+ mi.
0-25k
25-50k
50-75k
75-100k
100-125k
125-150k
150k+
Each bar shows the share of total complaints filed at that mileage range. Peak failure window highlighted. Some owners report problems earlier; some make it well past 150,000 miles symptom-free. Maintenance habits and driving conditions shift the curve as much as mileage alone.
What stands out
Owners have filed 27 powertrain complaints with NHTSA against this vehicle, but no formal recall covers the issue — the federal record reflects what manufacturers have admitted, not everything owners are reporting.
Among the 7 model years of Chevrolet Silverado HD in our records for powertrain problems, this one ranks #2 by owner-complaint volume.
The failure pattern owners describe
Owners report a range of transmission and powertrain failures on 2020 Silverado HD trucks, many related to recall N242454440 and NHTSA Campaign 24V797000. The most frequent issue involves harsh upshifts, transmission slipping, failure to shift, and rear wheel lock-up at highway speeds without warning lights. Several owners describe the transmission stalling without warning, forcing restart, or being stuck in third gear despite accelerator input.
One owner documented metallic flakes and burnt fluid at 80,000 miles; another experienced transmission overheating to 240°F while flat-towing. Transmission oil cooler lines fail at crimped joints, spraying fluid near hot exhaust and causing immediate loss of power—a fire and stranding hazard.
The valve body is cited as a design flaw; one owner notes that after valve body failure, the transmission lacks proper lubrication, leading to catastrophic damage GM will not fully cover. An unrelated but critical failure involves rear differential destruction when the vehicle shifts into four-wheel-drive automatically at low mileage (8,400 miles). Output shafts shear at mileages between 20,000 and 80,000 miles.
A vehicle shifted from Park to Drive on its own while idling and crashed into a house. Separate complaints cite DEF tank heater shorts melting wiring harnesses, diesel fuel injector connector shorts causing misfires, and NOx sensor "slow response" issues. Across all narratives, owners struggle to get recall repairs completed because parts remain on backorder for months, leaving them driving vehicles with known defects or unrepaired transmissions entirely.
Same Chevrolet Silverado HD powertrain reports on nearby years: 2021 · 2022 · 2023
Failure modes owners describe
Transmission valve body defect and cascading transmission failure
Valve body design flaw in 10-speed transmission causes harsh upshifts, transmission slipping, failure to shift, and flare shifts. When valve body fails, transmission cannot receive proper lubrication, causing catastrophic internal damage. Owners report GM covers only the valve body under recall, not secondary damage from the faulty design.
When: Variable; 67,000–188,000 miles reported; some failures early
Symptoms owners cite: Harsh, jerking upshifts; Transmission slipping and hesitation on acceleration; Vehicle stuck in third gear despite throttle input; Transmission overheating while towing (temps to 240°F); Burnt-smelling, dark brown fluid with metallic flakes; Flare shifting and shuddering
Codes mentioned: P1089, P22F9
Repairs/costs cited: Valve body replacement ($6,800 cited in one complaint); full transmission replacement required after secondary damage. One owner paid for aftermarket transmission rebuild from retirement savings. Parts unavailable for extended periods.
Recalls/TSBs owners mention: Recall N242454440 (valve body replacement); NHTSA Campaign 24V797000. Parts on backorder for months. GM warranty covers valve body only; secondary transmission damage not covered. Software update offered but does not resolve shifting issues. One owner reports GM engineer confirmed duplicated fault codes in memory.
Transmission oil cooler line failure at crimp joint
Metal-to-rubber hose crimp joint fails, spraying transmission fluid near hot exhaust and causing immediate loss of motive power. Creates fire hazard and forces vehicles to shoulder at highway speeds.
When: 67,000 miles reported in two separate complaints
Symptoms owners cite: Transmission fluid pooling under vehicle; Smoke from rear of vehicle; Loss of motive power while driving; Fluid sprayed near hot exhaust (fire risk)
Repairs/costs cited: Transmission oil cooler line replacement. One vehicle required full transmission replacement after fluid loss caused internal damage. Repairs completed at dealerships.
Recalls/TSBs owners mention: Extended Coverage Program (CSP N212326940) issued but VIN not included in one case. Repairs completed; manufacturer notified.
Rear wheel lock-up during acceleration and towing
Rear wheels lock up momentarily while driving or towing at speeds from 30 to 55 MPH, creating crash and jackknife risk. No warning lights precede failure. Software updates applied during recall repair do not resolve recurring lock-ups.
When: Occurring at 81,000 and 188,000 miles; happened multiple times per owner
Symptoms owners cite: Rear wheels lock up suddenly without warning; Occurs while towing campers; No warning lights illuminated; Hazardous situation during highway merging
Repairs/costs cited: Software update performed under recall 24V797000 in at least two cases; failure recurred despite update. Dealership unable to duplicate failure in one case. One owner traded vehicle to dealership due to unresolved safety concern.
Recalls/TSBs owners mention: NHTSA Campaign 24V797000 (Power Train). Software update applied but does not permanently resolve issue. Manufacturer stated one-time free repair applies; no further assistance offered after failure recurrence. One owner reports recall parts unavailable.
Transmission output shaft shear
Output shaft fractures or shears, rendering vehicle immobile. Owner reports this is a known common defect across model. Occurs at low to moderate mileage.
When: 20,000–80,000 miles reported by owners; one case at 68,000 miles
Symptoms owners cite: Loud bang while pulling onto road or accelerating; Complete loss of forward and reverse motion; Vehicle unable to move
Repairs/costs cited: Output shaft replacement required. No repairs completed in complaint narrative.
Unintended shift from Park to Drive while idling
Vehicle shifts itself from Park into Drive while stopped and idling in driveway with no driver input. Owner was forced to manually shift to Reverse and apply emergency brake as truck accelerated toward garage and house.
When: Low mileage (narrative does not specify)
Symptoms owners cite: Vehicle shifts from Park to Drive on its own; No warning lights or alerts before shift; Vehicle accelerates toward fixed object
Repairs/costs cited: Owner manually controlled vehicle; no dealer repair described.
Automatic four-wheel-drive engagement causing differential and axle destruction
Vehicle automatically shifts into four-wheel-drive while driving in two-wheel-drive mode, causing catastrophic front-end, differential, and axle damage. Attributed to auto mode design flaw. Dealership unable to duplicate; independent mechanic confirmed differential damage related to auto mode feature.
When: 8,400 miles
Symptoms owners cite: Vehicle independently shifts into four-wheel-drive; Front differential damaged; Front axle destroyed
Repairs/costs cited: Front differential replacement needed. No repair completed. Independent mechanic diagnosed design flaw in auto mode feature.
Recalls/TSBs owners mention: Manufacturer not made aware of failure; dealership could not duplicate.
DEF tank heater electrical fault causing wiring harness melt
DEF tank heater shorts internally, melting wiring harness and triggering limp mode. Critical hazard when towing trailers over long distances. One owner required two heater replacements at 24,000 and 47,000 miles.
When: 24,000 and 47,000 miles reported for replacement; limp mode issues ongoing
Symptoms owners cite: Wiring harness melts; Engine enters limp mode; Loss of power under load; Faulty part on extended backorder
Repairs/costs cited: DEF tank heater replacement performed. One owner required replacement twice by 47K miles.
Recalls/TSBs owners mention: No reparations from GM reported; parts on six-month backorder.
Diesel fuel injector connector short and engine misfire
Diesel fuel injector connector on cylinder 4 shorts out, causing engine misfire and significant power loss while driving. Vehicle becomes underpowered and unsafe.
When: Failure mileage not specified
Symptoms owners cite: Connector shorts out; Engine misfires; Vehicle becomes underpowered while driving; Loss of acceleration response
Repairs/costs cited: Connector repair required; no completion status stated.
NOx sensor slow-response issue and ECM fault detection failure
NOx sensor exhibits slow response; Engine Control Module (ECM) may fail to properly detect the sensor fault. Leads to potential emission issues and reduced engine performance. Recall requires ECM software update.
When: Not specified
Symptoms owners cite: P22F9 diagnostic code; Slow NOx sensor response; Check engine light cycles on and off over extended mileage; Duplicated fault codes in memory
Codes mentioned: P22F9
Repairs/costs cited: ECM software update required per recall. One owner reports problems persist after multiple dealership repairs despite software and other component replacements; GM engineer confirmed duplicated codes in memory.
Recalls/TSBs owners mention: Recall identified; software update required. One owner states update does not resolve underlying issue and requests recall classification for P1089 fuel deceleration code.
Transmission failure—no shift response and stalling
Transmission fails to shift or respond to throttle input, causing loss of acceleration and stalling without warning. No check engine lights precede failures. Transmission requires full replacement; parts severely backordered.
When: 80,000–81,000 miles reported
Symptoms owners cite: Transmission slipping without warning; Vehicle stalls without warning; Failure to shift after idling or on acceleration; No warning lights illuminated
Repairs/costs cited: Full transmission replacement required. Parts unavailable; vehicle not repaired in multiple cases due to supply shortages lasting months.
Recalls/TSBs owners mention: Manufacturer referred owner to NHTSA Hotline. No assistance offered. Extended parts backorder; manufacturer unable to provide replacement timeline.
Synthesized from 27 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 8 most recent
The Transmission Oil Cooler line separated at the crimp joint from the rubber hose to metal pipe. This sprayed trans fluid all over my hot exhaust(fire risk) and caused and immediate loss of propulsion as I was accelerating to merge onto the highway. I was lucky enough to have multiple vehicles swerve to avoid hitting me. This defect left me on the side of the expressway.
The contact owns a 2020 Chevrolet Silverado 2500. The contact received notification of NHTSA Campaign Number: 24V797000 (Power Train); however, the part to do the recall repair was unavailable. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The dealer was contacted and confirmed that parts were not yet available for the recall repair. The…
Truck on its own Shift from Park to Drive on its own while at idle. Summary: My 2020 Silverado 2500HD was in the driveway idling in Park. The vehicle was empty and I was checking the garage for screws from a project I had just completed and I wanted to make sure they were all picked up before I parked the truck in the garage so that I did not get a flat tire. After looking for screws and…
The contact owns a 2020 Chevrolet Silverado 2500. The contact received notification of NHTSA Campaign Number: 24V797000 (Power Train); however, the part to do the recall repair was not yet available. The located dealer was contacted. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was made aware of the issue. The contact…
The contact owns a 2020 Chevrolet Silverado 2500. The contact stated while driving 50 MPH, the accelerator pedal was depressed; however, the vehicle failed to respond. No warnings lights were illuminated. The contact pulled over to the side of the roadway, turned off and restarted the vehicle; however, while attempting to shift into drive the vehicle hesitated and failed to respond as needed. The…
The contact owns a 2020 Chevrolet Silverado 2500. The contact was notified of NHTSA Campaign Number: 24V797000 (Power Train); however, the part to do the recall repair was not yet available. The local dealer was made aware of the issue and confirmed that parts were not yet available. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The…
The contact owns a 2020 Chevrolet Silverado 2500. The contact stated that while driving at an undisclosed speed, the rear wheels locked up momentarily. The check engine warning light was illuminated. The vehicle was previously taken to the local dealer to be repaired under NHTSA Campaign Number: 24V797000 (Power Train). The vehicle was repaired, but the failure recurred. The manufacturer was…
Had powertrain trouble with your 2020 Chevrolet Silverado HD?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the powertrain problem on the 2020 Chevrolet Silverado HD?
It's a meaningful issue. 27 complaints have been filed and the failure mode causes operational problems for owners. Repairs average $2,500.
At what mileage does the powertrain typically fail?
Based on the 27 complaints filed, powertrain issues most often appear around 94,564 miles. Some report problems earlier; some make it well past 150,000 with no symptoms. Maintenance habits matter — vehicles that received timely fluid services and were not regularly overworked tend to last longer.
What does it cost to fix?
Independent shops typically charge around $2,500 for powertrain repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to powertrain?
No active recalls currently cover powertrain issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2020/Chevrolet/Silverado HD.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.