Audi Q7 stalling 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 28, 2026 · Engine · MN

What happened: During routine service on XXX at 64,148 miles, an independent Audi specialist ([XXX], [XXX]) found low coolant, coolant leaking into the vacuum system, and coolant on the belt drive. On XXX the shop replaced the water pump, thermostat, vacuum pump, vacuum tank, and vacuum lines at a cost of $6,314.30. Safety risk: The failure was found before any on-road incident. Left undetected, continued coolant loss could cause engine overheating and a stall while driving. Coolant contamination of the vacuum system and coolant on the drive belt could also compromise systems that depend on them. This failure mode is documented across EA839-equipped vehicles and is the subject of a pending class action ([XXX] v. Volkswagen Group of America, D.N.J.). Confirmation: Diagnosed and repaired by an independent Audi specialist. Not inspected by the manufacturer, police, or insurance. The failed components are [available / not retained]. Prior warnings: No warning lamps or messages were recorded at the time of inspection. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Sep 28, 2026 · Electrical, Engine · NY

While driving, the vehicle displayed an error message (occurring when going downhill), limited engine RPM to 1200, and illuminated a warning instructing the driver not to exceed 1200 RPM — a limp-mode condition that severely limited acceleration and the ability to maintain speed in traffic. On other occasions the vehicle entered limp mode and shut down while driving. The selling dealer, Audi Mohegan Lake (Mohegan Lake, NY), checked all systems, stored fault code P060C00, and stated a software update was needed, referencing TSB-2067767 — but advised the fix was not available. Audi was unable to diagnose or repair the defect. A buyback request was filed in April 2023 (Audi case AU-2023-0468) but never resolved; with no repair available, the vehicle was traded in November 2023.

Filed Jul 31, 2026 · Electrical, Engine · CA

My 2017 Audi Q7 with the 3.0T engine has experienced repeated engine/ignition system failures. The vehicle displays a "System Malfunction" warning light accompanied by shaking and stalling. This same malfunction has occurred at least 3 separate times over the past few years. Each time, a repair shop diagnosed and replaced faulty ignition coils, and the vehicle ran normally for a period of time before the identical malfunction returned. The vehicle is currently inoperable due to the most recent occurrence. This creates a safety risk because the stalling and shaking can occur while driving, with no clear warning beyond the malfunction light appearing at the same time as the symptoms begin. A stall or loss of power while in motion, especially in traffic or on a highway, could lead to a collision. The problem has been confirmed and repaired multiple times by an independent European auto repair specialist, who stated this is a known, recurring issue with this engine/model. The vehicle has not yet been inspected by the manufacturer directly. Separately, the vehicle has also developed excessive oil consumption, requiring approximately 2 gallons of oil added roughly every 6 weeks, with the frequency increasing over the last 2 months. I am uncertain whether the oil consumption and the recurring coil/ignition failures share a common root cause, but both issues are ongoing and unresolved. The vehicle and its components are available for inspection upon request.

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 Dec 15, 2025 · Engine · GA

- Engine water pump failure and coolant intrusion into the vacuum system. Parts were replaced on 5 Nov 2025 and possible still at the dealer's location. - The defect poses the following safety risks: It resulted in contamination of vacuum lines; potential for sudden engine stalling or loss of power while driving; potential for catastrophic damage to engine-management systems dependent on vacuum integrity; potential for damage to emissions and combustion-control systems; potential for reduced braking system performance if vacuum supply is compromised, expensive and unexpected component failures, and possible recurrence since the cause appears related to design rather than normal wear. Any failure can create cascading hazards affecting safety-critical functions. - The problem was confirmed by an authorized Audi dealer. Dealer name and contact info can be provided upon request. - I do not know if the dealer delivered the involved parts to the manufacturer or insurance representative for inspection. Police or others did not inspect it. - There were no warning lights, messages, or other symptoms of the problem prior to the failure. It was identified by the Audi technician on 5 November 2025 while the vehicle was in the dealer for other services. The failure occurred at 47,855 miles which is far below the average lifespan of a water pump or vacuum system.

Filed Nov 18, 2025 · Engine · PA

I am reporting a progressive oil consumption defect that led to a catastrophic engine failure in my 2018 Audi Q7. The vehicle was purchased Certified Pre-Owned (CPO). I reported the excessive oil use to an Audi dealer. The dealer attempted to address the issue by performing an engine cleaning/flush, but the engine failed shortly afterwards. Over time, the vehicle required frequent top-offs between service intervals. Eventually, the engine suffered a mechanical failure, resulting in a broken exhaust valve and internal engine damage while driving on the highway. The Audi dealer provided a repair estimate of approximately $12,000. Audi of America offered 40% assistance to make the repair, but does not recognize the underlying excessive oil consumption issue. Furthermore, the proposed repair only replaces the damaged valve and related components, but does not address the underlying excessive oil consumption that caused the failure. This means the vehicle may still: •unexpectedly run low on oil, •lose power while driving, •suffer additional internal damage, or •again experience sudden engine failure while driving. These conditions can cause dangerous drivability issues, including loss of acceleration and potential stalling at highway speeds. This appears to be a serious safety-related defect involving lubrication failure, component breakage, and potential loss of power. I am requesting that the federal safety agency review this issue to determine whether similar failures are occurring in other Audi Q7 vehicles with the 3.0T engine.

Filed Nov 17, 2025 · Electrical · NY

I am filing this complaint regarding a serious safety and mechanical issue involving my 2021 Audi Q7. The alternator on my vehicle was replaced by Audi in November 2024 as part of an official Audi recall. On October 22, 2025, less than one year later, the alternator failed while I was driving, causing the following safety hazards and damages: Sudden loss of battery power Complete battery drain Damage to the electrical stabilizer Vehicle shut down while driving Required towing Left me stranded on the road Another independent auto shop confirmed that the alternator failure directly caused the battery to fail. My vehicle is only four years old, and the battery should not fail under normal operation unless another component (such as the alternator) is defective. Audi of America refuses to cover the resulting damages, even though the alternator was replaced under their recall and failed prematurely. They have denied reimbursement for repairs, towing, and related expenses, despite clear evidence that the alternator caused the battery and electrical damage. This is a serious safety concern because the alternator failed without warning, and the vehicle lost electrical power while driving. I am requesting the federal safety agency to review this issue, as the failure of the recall-installed alternator may impact other Audi Q7 owners and may indicate a broader defect or improper recall repair. Thank you for your attention to this matter

Filed Sep 9, 2025 · Engine, Fuel system · TN

My 2017 Audi Q7 Prestige 3.0T 6Cyl GAS CREC Supercharged has experienced repeated, serious failures involving the engine, powertrain, and fuel system. - At 72,000 miles, the vehicle developed coolant leaks under the supercharger, a failed water pump, and soaked drive belts. Repairs included multiple hoses, gaskets, and thermostat replacement. -Shortly after, repeated PCV/Oil system failures caused oil leaks, warning lights, and engine shaking. Repairs included PCV system, oil separator, valve cover gasket, breather pipes, and new spark plugs. - at 111,000 miles, the low-pressure fuel pump and relay failed, causing the vehicle to stall and lose all power while driving- a major safety risk. -Most recently, the engine developed a severe misfire in cylinder #4. Compression testing confirmed abnormally low compression (15 psi) due to a suspected cracked valve seat. The vehicle cannot be repaired without a complete engine replacement, quoted at ~$20,000. Safety Impact: - Vehicle has stalled suddenly in traffic due to fuel and engine failures, risking crash or injury. - Coolant and oil leaks present a potential fire hazard. - Loss of power and shaking while driving put my family and others at risk. Inspection/Confirmation: -All problems have been repeatedly confirmed and repaired by an independent Audi specialty service center (S&S Auto Repair). - Numerous invoices document coolant, oil, fuel, and engine failures. Warning Signs: - Multiple dashboard warning lights appeared either right before or during failure, including engine malfunction, coolant loss, and auto start/stop malfunction. These repeated failures at relatively low mileage suggest a design/manufacturing defect with the Audi 3.0T engine platform that compromises both safety and reliability. The issue seems to be widespread amongst other Audi owners with the same 3.0T engine- Per AudiWorld Forums.

Filed Sep 2, 2025 · Transmission, Visibility · CO

I am filing a formal complaint regarding serious safety-related defects in a newly purchased Audi vehicle. Immediately upon delivery, the car presented: • A faulty solenoid, a critical engine component, creating risks of engine misfires, sudden stalling, loss of acceleration, and transmission malfunctions while driving. Such failures pose imminent hazards during the cross-country travel that military families like mine regularly undertake. • Defective windshield wipers from the outset, jeopardizing visibility and safety during inclement weather. These defects demonstrate systemic quality control failures by Audi, undermining the safety expectations owed to U.S. consumers. Requested Action I urge the federal safety agency to: 1. Investigate Audi for potential violations of federal motor vehicle safety standards. 2. Evaluate whether a recall is warranted, as this appears not to be an isolated case. 3. Hold Audi accountable for delivering vehicles with concealed or unaddressed safety defects. As a U.S. military officer, I cannot risk the safety of my family in a vehicle plagued by such defects. American families deserve full confidence that new vehicles meet uncompromising safety standards.