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 ↗2019 Audi A6 powertrain problems
severe Owners of the 2019 Audi A6 have filed 13 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
13
Recalls
0
Avg fix
$2,500
| Model year | powertrain complaints |
|---|---|
| 2016 A6 | 5 |
| 2019 A6 (this page) | 13 |
1fire
What stands out
No new NHTSA powertrain complaint has been filed on this vehicle in over 3 years — the issue may be aging out of the active population.
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 bulleitn provides informiaotn when there is a loss of coolant; mechanical coolant pump 2.9L, 3.0L V6 TFSI.
full bulletin at NHTSA ↗This bulletin provides information when the hydraulic pump cannot be adapted - P17EF00 in gearbox control unit.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
The dominant complaint is catastrophic failure of the 48V starter-generator (alternator) unit in early-production 2019 A6 models equipped with the mild hybrid system. Owners describe a cascade: yellow battery warning, then red battery warning, then total electrical shutdown—engine dies, dash goes black, transmission drops into neutral, steering becomes heavy, and no turn signals function. This happens in seconds, often mid-highway, leaving occupants stranded in traffic with no way to signal danger. One owner reported smoke with an electrical smell from the hood. Dealers confirm this is a widespread issue; one reported six vehicles in the lot with the same failure, another had 29 vehicles ahead waiting for parts. Wait times exceed 29 days to over a month, with no guaranteed ETA. The part is under warranty but no recall has been issued despite being identified as systemic.
Owners also report a 1–2 second throttle-response lag during low-speed acceleration that forces dangerous adjustments to driving behavior during merges and lane changes. Some owners experience stalling at traffic lights with no fault codes present, creating unpredictable restarts. One complaint describes the vehicle rolling backward while in Drive after stopping.
Failure modes owners describe
48V Starter-Generator (Alternator) Failure
The 48V mild hybrid electrical system's starter-generator component fails suddenly during operation, triggering a cascade of electrical system warnings and complete vehicle shutdown. Owners report this is specific to early-build 2019 A6 models with the 48V MHEV system. Multiple dealers have confirmed this as a systemic issue affecting numerous vehicles.
When: Varies; typically within 30 minutes of first warning; one owner reported failure the day after purchase; one at 29 vehicles ahead in dealer queue
Symptoms owners cite: Electrical system malfunction warning (yellow then red battery icon); Start-stop system malfunction message; Smoke with electrical smell from hood near battery terminal; All electrical systems shut down progressively or suddenly; Engine cuts out completely mid-drive; Dashboard screens (MMI, electronic dash) go black; Transmission goes into neutral; No turn signals or hazard lights available
Repairs/costs cited: Audi dealers confirm starter/generator/alternator replacement required; one dealer reported 42-day wait for alternator on order; another reported 29 vehicles ahead in queue waiting for parts; multiple dealers stating weeks to months for parts availability due to widespread issue
Recalls/TSBs owners mention: Under warranty; no recall issued despite being identified as known/systemic issue; one dealer told owner it is 'a known issue' with multiple A6s waiting for parts
Throttle Response Lag
Excessive delay between pressing the accelerator pedal and engine response, creating safety hazards during traffic merges, lane changes, and left turns across traffic. The lag is described as 1–2 seconds, forcing drivers to alter driving behavior to avoid dangerous situations.
When: Occurs in low-RPM acceleration scenarios (slow traffic, merging, lane changes)
Symptoms owners cite: 1–2 second delay between pedal input and vehicle acceleration; Especially evident during low-speed to higher-speed transitions; Creates unsafe merging and lane-change situations; Affects left turns across traffic
Stalling at Traffic Lights
Engine shuts off completely at stops, requiring restart. Occurs intermittently regardless of whether auto start-stop is enabled or disabled. No diagnostic fault codes are generated, making diagnosis difficult.
When: At traffic lights; intermittent
Symptoms owners cite: Engine shuts off at stop light; Occurs with auto start-stop on or off; Restart required; sometimes car restarts then immediately stalls again; Vehicle shaking violently reported in one instance
Repairs/costs cited: Two dealer visits yielded no error codes to diagnose
Reverse Rolling / Transmission Holding Failure
Vehicle rolls backward after coming to a complete stop in Drive, activating rear camera. Transmission remains in Drive the entire time.
When: After vehicle comes to complete stop
Symptoms owners cite: Vehicle rolls backward while in Drive; Reverse camera activates; No operator input causes roll
Synthesized from 13 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 3 most recent
While driving my 2019 Audi A6 Premium Plus I received error messages: "electrical system malfunction contact service", then "start stop system malfunction contact service", then "electrical system malfunction stop vehicle safely". I went on an Audi owner internet forum and read about others with the same errors. Reports from others indicated that in about 40 miles from the first message…
Starter/Generator Alternator failed and caused the battery to die ultimately leading to losing full power of the car on highway. Warning lamps were present and indicated "electrical system malfunction and contact the dealer for service." Car lost full power on the way to dealership and almost resulted in a crash. Component has been inspected by the Audi Dealer and confirmed to be the issue.…
Vehicle stopped and is not operational. Dealer stated that the generator went out. Part is not available due to this problem occuring on so many vehicles. Vehicle has been in the shop since late, October it is now November 28th and still no ETA on part arrival or repair completion.
Had powertrain trouble with your 2019 Audi A6?
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 2019 Audi A6?
It's a meaningful issue. 13 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 13 complaints filed, powertrain issues most often appear around 2,500 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/2019/Audi/A6.
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.