The contact owns a 2021 Chevrolet Silverado 1500. The contact stated that while driving 10 MPH, the vehicle hesitated and shifted into another unknown gear independently. The vehicle was taken to the dealer where it was diagnosed that the transmission torque converter and the valve body needed to be replaced. The vehicle was not repaired. The manufacturer was not notified of the failure when a…
2021 Chevrolet Silverado powertrain problems
moderate 209 complaints filed with NHTSA · avg repair $2,500 · see powertrain across all vehicles →
Failure mileage
Complaints
209
Recalls
0
Avg fix
$2,500
5crashes
4injuries
When does it fail?
Of the 209 powertrain complaints filed for the 2021 Chevrolet Silverado, here's the actual mileage breakdown — failures cluster heaviest at 50,000-75,000 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 209 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 21 model years of Chevrolet Silverado in our records for powertrain problems, this one ranks #3 by owner-complaint volume.
The failure pattern owners describe
Owners report multiple distinct powertrain failures across the 2021 Silverado lineup. Transmission issues dominate complaints: hard shifts, slipping, shuddering between 20–60 mph, rear-wheel lockups during acceleration or normal driving, and inability to shift into reverse or hold gears—many occurring around 55,000–100,000 miles. Several owners describe sudden loss of power or stalling while driving at highway speeds, with check engine lights coming on afterward. Valve body failures are cited repeatedly, some causing the truck to enter limp mode or downshift unexpectedly with violent jerking. Torque converter failures and transmission cooling system ruptures are documented.
Engine failures are equally serious: collapsed lifters causing ticking sounds, sudden loss of power, and engine knocking; failed high-pressure fuel pumps; camshaft damage; bent pushrods; and a few catastrophic seizures. Some lifter failures occur as early as 8,600 miles with no prior warning. A few trucks experienced complete engine failure requiring replacement, sometimes on warranty but often after warranty expiration. Electrical and fuel system issues also appear: loss of communication between modules, failed fuel regulators, and ground wire shorts causing smoking. Oil consumption and low oil pressure are mentioned in at least one case despite recent maintenance. Rear-wheel lockup events—sometimes linked to transmission valve failures, sometimes independent—create dangerous brake-like braking, forcing owners to limp home at low speed. Several owners had to be towed; many dealerships report parts on backorder for months, leaving trucks unrepaired. Recall 24V797000 (PowerTrain) is mentioned in many narratives but does not cover all VINs experiencing identical symptoms.
Same Chevrolet Silverado powertrain reports on nearby years: 2018 · 2020 · 2022 · 2023 · 2024
Failure modes owners describe
Transmission Hard Shifts / Jerking / Shuddering
Transmission shifts abruptly, often accompanied by shuddering, clunking, or a violent jerk—sometimes described as being hit from behind or a hard downshift to lower gears.
When: 55,000–100,000 miles; some starting as early as 32,000 miles; symptoms worsen over time
Symptoms owners cite: Hard shift from 1st to 2nd or 2nd to 1st gear; Shuddering between 20–60 mph; Jerking sensation during acceleration or at constant speed; Random upshift or downshift at steady speed; Transmission overheating; Vehicle lurching or violent downshifting
Codes mentioned: P0700 (Transmission Control Module requested MIL illumination), P2732 (Transmission control solenoid valve 6 stuck off), P0747 (Transmission Valve Body Open), B3205-4B-BCM (Steering column circuit locked)
Repairs/costs cited: Owners cite transmission service ($800), valve body replacement, transmission control module (TCM) reprogramming, fluid flush and refill, thermal bypass valve replacement, external and internal TCM wire replacement, and full transmission replacement ($7,900 in one case). Parts frequently on backorder for months.
Recalls/TSBs owners mention: GM recall 24V797000 (PowerTrain) issued but does not cover all affected VINs or all instances; service bulletins released (December 2024 bulletin on pinched transmission line); GM repair programs offered at reduced cost; some owners denied coverage or told to pay out of pocket if outside powertrain warranty (typically 60,000 miles)
Transmission Valve Body Failure / Rear Wheel Lockup
Transmission valve body fails, causing the rear wheels to lock up momentarily or completely, creating a braking sensation and loss of control.
When: 34,000–140,000 miles
Symptoms owners cite: Rear wheels lock up without warning; Vehicle slides across road or nearly goes into ditch; Abnormal screeching sound during braking; Rapid deceleration like brakes were slammed; Violent jolt or shudder; Transmission failing to shift into intended gear after lockup; Check engine light, traction control light, and parking brake light illuminate
Codes mentioned: P0747 (Transmission Valve Body Open / Pressure Control Cylinder failure)
Repairs/costs cited: Valve body replacement required; one owner cited a service bulletin and multiple dealer visits spanning months. Parts are frequently on backorder.
Recalls/TSBs owners mention: Recall 24V797000 (PowerTrain) issued; however, many affected VINs are not included in recall despite exhibiting identical symptoms. Some dealers unable to diagnose during test drives; others confirmed the issue but could not complete repair due to parts unavailability.
Transmission Loss of Power / Stalling
Vehicle suddenly loses power, stalls, or refuses to shift while driving at various speeds, with or without warning lights.
When: 32,000–100,000 miles
Symptoms owners cite: Sudden loss of power while driving at highway speeds (50–75 mph); Vehicle stalls on highway, at traffic light, or during normal driving; Engine shuts off without warning; Vehicle fails to shift past 15 mph or accelerate normally; Low power / stumbling feeling when trying to accelerate; Vehicle pulsates before stalling
Codes mentioned: P0700 (Transmission Control Module requested MIL illumination), P2635 (Fuel management system, engine and transmission not performing as expected)
Repairs/costs cited: Dealers perform generic transmission code clearing without permanent fix; full transmission replacement recommended in some cases. One owner had vehicle at dealership for 3+ months waiting for engine and transmission replacement parts.
Recalls/TSBs owners mention: Recall 24V797000 (PowerTrain) noted; one owner's recall repair did not resolve the issue and failure recurred one hour after repair. Some dealerships unable to isolate the problem and proposed $6,300 wiring harness replacement.
Torque Converter Failure
Torque converter fails, potentially allowing metal debris to contaminate the transmission, creating drivability issues and safety risk.
When: 59,000–66,000 miles
Symptoms owners cite: Abnormal transmission behavior; Delayed or failed acceleration; Unpredictable drivability; Loss of power
Repairs/costs cited: Full transmission replacement recommended due to contamination risk from metal debris; one owner cited repair cost around $7,900. Torque converter replacement alone was deemed insufficient.
Recalls/TSBs owners mention: No recall noted. Dealership recommended full transmission replacement per standard protocol for contaminated systems.
Collapsed Lifters / Valve Train Failure
Lifters collapse, causing bent pushrods, damaged camshaft, ticking noise, and sudden loss of engine power or stalling.
When: 8,600–100,000+ miles; some as early as 3 months of ownership
Symptoms owners cite: Engine ticking or knocking sound; Sudden loss of power while driving; Vehicle stalls or nearly stalls; Engine rough running / misfire; Check engine light illuminates or flashes; Multiple warning lights (traction control, stability control); Low power / inability to accelerate beyond 45 mph
Codes mentioned: Cylinder misfire codes (e.g., P0303 for cylinder 3), ESC (Electronic Stability Control) codes
Repairs/costs cited: All lifters on one or both banks replaced; pushrods and camshaft replacement needed in damage cases. One owner reported paying out-of-pocket repair cost upwards of $5,000 after warranty expired. Dealership replaced only failed bank if vehicle exceeded 16,000 miles, refusing to replace other bank preemptively despite owner request.
Recalls/TSBs owners mention: Service bulletins issued (multiple over several years); no formal recall issued, only internal service bulletins. GM customer service declined to replace both banks of lifters on one vehicle built 2/21 (outside 11/21 cutoff window), citing mileage threshold.
Engine Catastrophic Failure / Seizure
Engine seizes, shears rod, or suffers internal mechanical failure, requiring complete engine replacement.
When: 24,000–100,000+ miles
Symptoms owners cite: Loud knocking or clanking noise; Sudden loss of power and uncontrollable deceleration; Engine shakes uncontrollably; Multiple check engine lights illuminate; Engine smoking
Repairs/costs cited: Complete engine replacement required; one owner paid $12,000 out of pocket after warranty expired by 2 months. Remanufactured crate engine installed in another case under remaining warranty.
Recalls/TSBs owners mention: Recall N252494000 (Engine Failure) mentioned in one narrative; however, affected VIN was not included in recall despite exhibiting identical failure symptoms. GM initially refused coverage citing warranty expiration, later reimbursed one owner after negotiation.
High-Pressure Fuel Pump Failure
High-pressure fuel pump fails, causing sudden power loss and unsafe speed differential on highway.
When: Varies; one case reported under powertrain warranty
Symptoms owners cite: Sudden reduction in power and speed while driving at highway speeds (~75 mph); Hard engine starts (cold start issues); Check engine light comes on intermittently
Repairs/costs cited: Fuel regulator (high/low pressure) replacement required; one owner cited repair cost over $1,030. Dealership initially refused coverage under powertrain warranty.
Recalls/TSBs owners mention: One dealership denied coverage, stating faulty fuel regulator not covered under powertrain warranty.
Engine Control Module / Electrical Communication Loss
Vehicle loses communication between engine and transmission control modules or other electrical systems, causing stalling and safety hazard.
When: 48,000 miles; varies
Symptoms owners cite: Vehicle stalls without warning; Engine shuts off on highway or at traffic lights; Dealership detects loss of communication between modules
Repairs/costs cited: One dealer proposed removing cab and replacing entire wiring harness at cost of $6,300. No successful repair documented; owner unable to afford repair.
Recalls/TSBs owners mention: None documented beyond dealership proposal.
Purge Pump / Emissions System Defect
Purge pump on emissions control system fails, flagged by recall but some owners unable to access repair or face additional diagnostic costs.
When: Varies; recall issued 6 months after purchase in one case
Symptoms owners cite: Check engine light
Repairs/costs cited: Purge pump replacement under recall; one dealer performed scan diagnostic confirming failure but refused to replace pump until full diagnostic completed, costing owner additional money.
Recalls/TSBs owners mention: GM recall issued; one dealer deferred repair citing need for full diagnostic first despite scan confirming failure.
Transmission Refuses to Shift or Shift to Park Malfunction
Transmission fails to shift into gears or vehicle fails to turn off because transmission will not shift to park.
When: 60,072 miles at inspection; 53,000 miles in another case
Symptoms owners cite: Vehicle will not go into drive or reverse; Vehicle will not shift past 1st gear or only operates in 1st, 2nd, 3rd; Message 'Shift to Park' displayed when attempting to turn off vehicle; Vehicle fails to turn off unintendedly; Transmission Control Ignition fuse removal required to enable movement in limited gears
Codes mentioned: Transmission Control Module codes, Solenoid 3 stuck off, Solenoid 4 stuck on (one case), P2732 (Transmission control solenoid valve 6 stuck off)
Repairs/costs cited: Valve body replacement ($585–$4,000+); one owner paid reduced cost of $585 through GM program but subsequent check engine light appeared indicating solenoid failure. Full transmission replacement recommended in some cases ($7,900+).
Recalls/TSBs owners mention: GM offers program-reduced repair cost on some valve body replacements. Powertrain warranty expired at 60,000 miles; extended warranty voided if oil change schedule missed.
Unexplained Power Loss / Reduced Engine Power / Limp Mode
Engine loses power or enters limp mode during driving, reducing speed and creating hazard; sometimes related to coolant control valve or other emission systems.
When: Varies; one case at 103 miles, others at 45,000–120,000 miles
Symptoms owners cite: Sudden loss of power while driving; Engine reduced power warning on display; Vehicle downshifts hard and engine revs; Vehicle slows suddenly with traffic passing; Check engine light illuminates and may flash
Codes mentioned: P1098 (Engine Coolant Control Valve), P2635 (Fuel management system)
Repairs/costs cited: Diagnostic testing and repair depends on root cause; some cases require engine control module attention, others fuel system service. Parts and diagnostics may not be covered if outside warranty.
Recalls/TSBs owners mention: GM Special Coverage N252508341 issued for coolant control valve issue; however, some affected VINs do not pull up coverage despite having identical model, engine, and symptoms. Service bulletins issued.
Synthesized from 209 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 4 most recent
Throttle Body Failure Anti brake lock failure Throttle position sensor failure Power reduced *Vehicle has been to repair shop 3 times and the issue prevails. It poses a risk to my community because my loses power sporadically*
The contact owns a 2021 Chevrolet Silverado 1500. The contact stated that after the vehicle was stopped at a traffic light or stop sign, while attempting to accelerate, the vehicle briefly lost motive power before slamming into gear. The check engine warning light was illuminated. The contact stated that the failure had gotten worse. The vehicle was taken to the dealer; however, no cause for the…
Transmission lags between 1st & 2nd gear some times as long as 3 seconds making transfer case hit hard . I have had this truck at the dealer 2 are 3 times with this and other matters , the maintenance technician reports he can not reduplicate my grievance , this malfunction occurs more prominently in cold weather in morning on first take off . All so turn signal malfunction at random no…
Had powertrain trouble with your 2021 Chevrolet Silverado?
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 2021 Chevrolet Silverado?
It's a documented issue but not catastrophic. 209 complaints have been filed. Repairs average $2,500 and most owners catch it before it causes a breakdown.
At what mileage does the powertrain typically fail?
Across the 33 complaints that reported odometer mileage, most powertrain failures cluster between 41,000 and 101,000 miles, with the median around 64,900. A quarter of owners report trouble before 41,000; a quarter make it past 101,000. Maintenance history matters more than the odometer alone — this is the reported failure window, not a guarantee.
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/2021/Chevrolet/Silverado.
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.