This bulletin provides information when there are noises after selecting a ear while idling and the vehicle is stationary, or while driving.
full bulletin at NHTSA ↗2021 Audi Q5 powertrain problems
moderate Owners of the 2021 Audi Q5 have filed 10 NHTSA complaints about the powertrain at roughly $2,500 to repair (U.S. federal records, as of July 2026). Source: NHTSA Office of Defects Investigation. See powertrain across all vehicles →
Complaints
10
Recalls
0
Avg fix
$2,500
| Model year | powertrain complaints |
|---|---|
| 2018 Q5 | 9 |
| 2019 Q5 | 5 |
| 2021 Q5 (this page) | 10 |
| 2023 Q5 | 3 |
| 2025 Q5 | 3 |
When does it fail?
Of the 10 powertrain complaints filed for the 2021 Audi Q5, here's the actual mileage breakdown — failures cluster heaviest at 0-25,000 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
Among the 10 model years of Audi Q5 in our records for powertrain problems, this one ranks #2 by owner-complaint volume.
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering powertrain on this vehicle — documented repair instructions, service campaigns, or warranty extensions sent to dealers. A TSB isn't a recall (it's not a free safety remedy), but it's the manufacturer acknowledging the issue and how to fix it.
This bulletin provides informatin when there is binding or vibrations in tight turns with quattro Ultra.
full bulletin at NHTSA ↗The high-voltage batteries in electric vehicles are subject to various ageing effects which could lead to the energy content (energy density) being reduced. This reduction in the energy content, which is due to factors. Revised header. Added Model years
full bulletin at NHTSA ↗This bulletin provides information when the hydraulic pump cannot be adapted - P17EF00 in gearbox control unit.
full bulletin at NHTSA ↗This bulletin provides informatin when there is binding or vibrations in tight turns with quattro Ultra.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
Owners describe a cascade of critical powertrain and control system failures in the 2021 Audi Q5. The most alarming is the gateway module—the vehicle's central communication hub—located beneath the rear seat. When exposed to moisture from spills or condensation, this module fails completely, shutting down the engine and all electrical systems without warning while the car is in motion. Multiple owners report losing total power and barely coasting to safety. Audi acknowledges this design flaw but offers only temporary plastic wrapping as a fix, which does nothing to stop condensation.
Transmission failures also appear repeatedly. The S-tronic transmission disengages without warning, shifting to neutral mid-drive with no throttle response. Control module replacement and repeated recalibrations have failed; dealers end up replacing entire transmissions despite extremely low mileage. Even at 9,000 miles, some owners face complete transmission replacement.
The center differential shudders and bucks during low-speed turns, causing poor handling and uneven tire wear. Audi issued a technical bulletin acknowledging this as a known issue but repairs attempted are temporary fluid adjustments rather than part replacement.
Engine oil suddenly expels from under the hood without visible leaks or warning lights, eventually causing engine seizure. One owner suspects undisclosed coolant issues led to the failure. Clutch and ECM chip failures at low mileage round out the pattern.
Failure modes owners describe
Gateway module water intrusion and failure
The gateway module located beneath the rear seat/middle row seat acts as the vehicle's central communication hub. When exposed to moisture—from spills, condensation due to high humidity, or water ingress—the module corrodes and fails, causing complete engine and electrical shutdown while driving.
When: Reported across various mileages; occurs without warning during normal driving
Symptoms owners cite: Abrupt engine shutdown while driving; Complete loss of electrical power; Loss of all engine function; Vehicle becomes immobilized in traffic
Repairs/costs cited: Audi has attempted temporary fixes such as wrapping the module in plastic, but owners note this does not address the root condensation issue. No permanent factory solution reported.
Recalls/TSBs owners mention: Audi is aware of the design flaw but has no solution; some owners report warranty denials once coverage expires
S-tronic transmission control module and internal gear failure
Transmission control module (mechatronic unit) failure followed by complete internal transmission gear set failure. Multiple repair attempts and control module replacements fail to resolve the issue, requiring full transmission replacement despite low mileage.
When: Low mileage condition; one reported at approximately 9,000 miles
Symptoms owners cite: Sudden transmission disengagement without warning; Vehicle shifts into neutral while in motion; No response to accelerator pedal; Engine will not rev during failure; Hesitation and bucking when starting from a stop; 'Transmission malfunction' warning message; Loss of reverse capability warning
Repairs/costs cited: Transmission control module replacement approved and completed; however, issue persisted. Dealer ultimately requires full transmission replacement. Repair costs not specified in narratives.
Recalls/TSBs owners mention: Audi of America approved transmission control module replacement but refused further assistance citing vehicle being slightly outside standard warranty period, despite safety-critical failure and extremely low mileage
Center differential and 4-WD clutch shuddering/bucking
Center differential or 4-WD clutch malfunction causing vehicle shuddering, bucking, and jittering during low-speed turns and cornering. Audi issued a technical service bulletin indicating this is a known issue. Repairs attempted with fluid heating adjustment rather than parts replacement.
When: Reported from early in vehicle ownership; one case at approximately 50,000 miles
Symptoms owners cite: Shuddering when taking turns at low speed; Bucking and jittering during cornering; Loss of traction and poor handling; Uneven tire wear
Repairs/costs cited: One case diagnosed as requiring center differential replacement; however, repair performed was heating fluid adjustment rather than parts replacement. Another case diagnosed as requiring 4-WD clutch and rear differential replacement; owner did not repair due to cost.
Recalls/TSBs owners mention: Audi issued technical service bulletin acknowledging the problem; manufacturer refused assistance in at least one case
Engine oil expulsion and catastrophic engine failure
Engine suddenly expels oil from under the hood without warning or visible leak. Despite pressure testing showing no leak source, oil loss recurs, eventually leading to engine seizure and complete failure.
When: Occurred during cold winter season initially; final failure unspecified
Symptoms owners cite: Loud fan engagement at stop/park; Start/stop malfunction warning; Coolant low warning; Engine temperature warning; Max RPM warning; Sudden oil expulsion under hood with no warning lights; Engine seizure and failure
Repairs/costs cited: Pressure test performed with no leak source identified. Oil changed and replaced; no permanent repair achieved before second failure caused engine seizure.
Recalls/TSBs owners mention: Owner questioned why vehicle was not included in recall for coolant issues leading to engine failure; no manufacturer response documented
ECM chip failure causing stalling
Engine control module (ECM) chip failure resulting in sudden engine stall at highway speeds with warning message displayed.
When: At approximately 9,000 miles
Symptoms owners cite: 'Transmission Engine Failure' warning message on instrument panel; Vehicle stall while attempting to move to side of road; Difficulty restarting vehicle
Repairs/costs cited: ECM chip replaced by dealer.
Clutch failure causing stall during reverse
Clutch failure causing abrupt engine stall while in reverse with no warning lights.
When: At approximately 9,000 miles
Symptoms owners cite: Vehicle stall while reversing; No warning lights illuminated prior to failure
Repairs/costs cited: Clutch repaired/replaced by dealer.
Synthesized from 10 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 5 most recent
While driving my 2021 Audi Q5, the vehicle experienced a sudden transmission disengagement without warning. The vehicle behaved as if it had shifted into neutral while in motion. When this occurred, pressing the accelerator produced no response — the engine would not rev and the vehicle would not accelerate. This created a serious safety risk as it occurred during normal driving conditions and…
The engine has failed and I am not sure why my Q5 was not included in the recall for coolant issues leading to engine failure. My issue started last winter when the car would suddenly kick in a loud fan. It would flash a warning that the start/stop malfunctioned as it only happened when stopped and/or parked. It was extremely alarming to hear so I would turn the car off and let it sit. When I…
While driving on the road, multiple warning and error messages suddenly appeared on dashboard. Entire car shut down in very short time left no time for driver to safely pull over. The car cannot move in the middle of the road and put the driver, passengers and surrounding vehicles at risk. The car was towed to a dealer and they confirmed the gate way module under rear seat is wet and shorted.
The contact owns a 2021 Audi Q5. The contact stated that while she was driving 65-70 MPH, the warning message "Transmission Engine Failure" appeared on the instrument panel. The vehicle inadvertently stalled while attempting to veer to the side of the road. The contact stated she was able to restart the vehicle after several attempts however, the vehicle was towed to her residence. The dealer was…
My car always did a weird shuddering thing when taking turns a certain way. I just thought it was part of how the new vehicle worked. I thought it was strange when I took my car in to repair a front tire, and was told / showed that the back two tire treads were worn down. The new car only had 20,249 miles. But I read somewhere that some new car dealers use lower tread tires to save money, so I…
Had powertrain trouble with your 2021 Audi Q5?
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 Audi Q5?
It's a documented issue but not catastrophic. 10 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?
Based on the 10 complaints filed, powertrain issues most often appear around 29,500 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/2021/Audi/Q5.
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.