2020 Audi Q7 problems

Filed Oct 25, 2026 · Electrical · VA

COMPONENT: 48V mild-hybrid electrical system — engine ground connections, Belt Starter Generator circuit, and 48V lithium battery. The vehicle is available for inspection upon request; the 48V battery dealer now call failed has not yet been replaced. SAFETY RISK: On 8/1/2026, the vehicle suffered sudden, complete electrical failure while in motion immediately after exiting I-75 in Bradenton, FL, with my family aboard, including a child. The cluster displayed “Electrical system: malfunction! Safely stop vehicle” (red), then total power loss. I coasted into a parking lot; had this occurred minutes earlier at 70 mph in interstate traffic, a stall with degraded accessories would have been unavoidable. The vehicle would not restart until the system cooled. Risk is ongoing: faults now recur almost daily. CONFIRMED BY DEALER: Yes. Audi Sarasota (RO AUCS126809) diagnosed both main engine ground connections left loose after a 2/2026 engine replacement by an authorized Audi dealer — DTC U350100, Control Module Input Power “A” Circuit Low. A prior dealer had misdiagnosed it as a faulty 12V battery and returned the car unrepaired; it failed on the interstate 16 days later. In 10/2026 another dealer confirmed continuing failure (DTC P0A9400, DC/DC Converter Performance) and states the 48V battery is now failed, quoting $3,700 — probable consequential damage from the prolonged ground fault. OTHER INSPECTIONS: Three authorized Audi dealers; events also logged in Audi’s connected-vehicle telematics (manufacturer-accessible). Audi of America case 07647729 is open. PRIOR WARNINGS: Yes. Intermittent “Electrical system: malfunction” warnings began ~7/2026, escalating over weeks to persistent warnings and A/C loss (48V-powered) on 7/30/2026, two days before the failure. The same failure mode matches the BSG defect in the Steinhardt v. Volkswagen settlement

Filed Sep 22, 2026 · Engine · VA

See attached document for complaint.

Filed Sep 14, 2026 · Brakes · 73,000 miles · FL · crash · 1 injury

The contact owns a 2020 Audi Q7. The contact stated that while driving 15 MPH, the vehicle unexpectedly lost motive power and the brakes engaged without warning, causing the vehicle to rear-end another vehicle in front. The vehicle was towed to a local tow yard. The contact sustained injuries to the lower back, neck, and head. Medical attention was provided. The contact received continued treatment for whiplash, migraine headaches, and chiropractic treatments. A Police report was filed, but the information was unavailable. The failure mileage was approximately 73,000.

Filed Jul 23, 2026 · IL

Dashboard leather is bubbling, separating, and delaminating near the center windshield vents. This is a known manufacturing defect, Audi has issued a warranty extension (bulletin AWA-23-11) for this identical issue on the Q8, e-tron quattro, and R8 models, but not the Q7, despite the dashboard part number (4M8857001S33A) being identical across the Q7 and Q8. This appears to be a widespread issue affecting multiple Audi models sharing this dashboard component

Filed May 14, 2026 · Engine · WI

the first indication of an issue was oil consumption. It was using more oil than usual around the 70K mile mark. Then it started misfiring, and soon after a knocking noise coming from the engine. There are no check engine light on, after bringing it in for diagnostics, it read that it was a spark plug, once they got into the engine they discovered the cylinder had been stripped from the piston. Yes the diagnostics came from our foreign car mechanic. no, it has not been inspected by the manufacturer or police. Just the symptoms. sometimes the light would come on, and then it would go off. At this point it is off. All of this started in the fall of 2025.

Filed May 13, 2026 · Engine · PA

While my vehicle was in for the Audi piston issue, they stated my water pump needed to be replaced and isn’t covered by a recall (yet). My vehicle had less than 42,000 mile on it. I was lead to believe that this problem is coming up more often and they believe a class action lawsuit will come about. I needed to pay over $1,700 out of pocket and was told I was saving so much money because they already had the engine apart because of the piston recall. This is unacceptable.

Filed Mar 13, 2026 · Engine · 70,000 miles · FL

The contact owns a 2020 Audi Q7. The contact stated that while driving at an undisclosed speed, the transmission unexpectedly downshifted while the accelerator pedal was depressed. The check engine warning light was illuminated. The vehicle was taken to a local dealer, where the water pump, coolant pump, vacuum line, and vacuum reservoir were replaced. The manufacturer was made aware of the failure. The failure mileage was approximately 70,000.

Filed Feb 24, 2026 · Engine · AZ

I discovered this item while researching another issue. There was a class action law suit against VW/Audi for the Water Pump and coolant leaking into the system. The class action covered the year and model for my Audi (2020 Q7) but my VIN was not included. The class action ended in 2024. On 8/4/25, My water pump went out because of coolant going into system. A $6,000 repair. I brought the issue up with Audi. No response.

Filed Feb 24, 2026 · Fuel system · AZ

My 2020 Audi Q7 with 49,500 miles had a complete engine shut down while driving. Towed to Audi. Fuel Pump was recalled and replaced on 1/2023. Audi stated it was the jet suction pump inside the saddle fuel tank. Research discovered that this saddle tank has been problem for this model and year. Audi only covered a portion of the cost. The entire fuel tank had to be replaced. 16 days to complete.

Filed Aug 5, 2025 · Electrical · TX · fire

I am filing a complaint concerning serious safety risks associated with my 2020 Audi Q7 (VIN: [XXX] ) purchased as a Certified Pre-Owned vehicle from Audi Dominion San Antonio. It is currently under service at Audi Central Houston, where multiple concerning events occurred. Timeline and Issues: - Initial diagnosis identified a fire-damaged electrical harness, estimated at $1,400 for replacement. - After repair attempts, the vehicle began smoking, and the diagnosis expanded to include additional compromised electrical lines. The revised quote skyrocketed to $4,700 (later reduced to $3,100). - After nearly two months in service, I was informed that the AC compressor is now deemed "bad" due to debris from the harness, an issue not mentioned in previous inspections. Safety Concerns: 1. Inconsistent Diagnosis: There was no mention of compressor damage during initial assessments. This late-stage discovery indicates negligence or potential additional damage during servicing. 2. Risky AC Activation: A technician attempted to clean the compromised AC compressor and activated the system, a procedure that is dangerous given the debris. This could lead to refrigerant leaks and electrical shorts. 3. Conflicting Statements: Audi Central Houston claims the compressor was previously damaged but also attempted to restore it. Such contradictions raise serious concerns about service integrity. 4. Certified Pre-Owned Credibility: The emergence of these costly issues questions the reliability guarantees of vehicles sold under Audi's Certified Pre-Owned program. Given that the vehicle began smoking shortly after being parked and had not undergone prior electrical work, I underscore the severe safety risks posed by potential electrical fires and undisclosed damage. These issues could endanger lives and property if not properly addressed. I strongly urge Audi USA and the federal safety agency to investigate this matter for potential technical service bulletins or recalls, especially fo INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION A