2018 Audi Q5: sudden loss of power

Filed Aug 28, 2026 · Electrical · NY

Description of Incident and Safety Defect:Failed Component & Inspection Availability: The gateway control module, located in an unsealed floor compartment under the rear seat, failed due to liquid/moisture intrusion. The damaged module and vehicle are fully available for inspection upon request.Safety Risk: The sudden short-circuit of this module forced the vehicle into an immediate emergency "limp mode" and partial drivetrain shutdown while actively driving on the road. Unexpectedly losing engine power and throttle responsiveness in active traffic put my safety and the safety of surrounding drivers at an immediate, severe risk of a collision.Dealer / Independent Confirmation: The failure has been officially confirmed by an authorized Audi dealership service center. However, the dealer refused to perform a free safety repair because Audi has excluded my specific VIN from the active recall list.Prior Inspections: Outside of the diagnosing Audi dealership service center, the vehicle and failed component have not yet been inspected by the manufacturer, police, or insurance representatives.Warning Lamps & Prior Symptoms: Immediately prior to the drivetrain failure, the dashboard lit up with sudden error messages and warning lamps regarding a critical system malfunction. There were no gradual symptoms or warning signs leading up to this incident; the catastrophic module failure occurred suddenly due to moisture contacting the unsealed component.Summary Assessment:This vehicle has suffered the identical engineering defect and hazardous failure mode detailed in the federal safety agency Recall Campaign 21V‑947 (Audi Recall Code 90S9). Audi’s current recall window is too narrow. It must be expanded to include all 2018 Audi Q5 vehicles experiencing this exact, catastrophic safety failure, regardless of their production date cut-offs. To date the car has 89924 miles

Filed Aug 18, 2026 · Electrical · NY

XXX My wife drive her 2018 audi q5 2.0 on express way with mother([XXX]),the car suddenly stall and lost all power ,because car bcm2 module has suffered liquid damage due to known vehicle design defect, towing to nearest repair shop change new bcm2 module and fix wire spend near $4000.00 dollars . INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Apr 16, 2026 · Steering · NJ

Title - Sudden Loss of Steering Control While Driving – 2018 Audi Q5 (Aug 2024) While driving my 2018 Audi Q5 at normal road speeds, the vehicle experienced a sudden and complete loss of power steering assist. A dashboard alert stating “Power Steering Malfunction” appeared simultaneously with an immediate and severe increase in steering effort, making the steering wheel extremely difficult to turn and effectively resulting in a loss of steering control. This incident occurred on a public roadway while I was transporting my family, including two young children (ages [XXX] and [XXX] ). The uncommanded loss of steering assist created an immediate and serious safety hazard and could have resulted in a crash, serious injuries, or fatalities to vehicle occupants and others on the road. I was able to bring the vehicle to a stop and subsequently to the dealership, only with significant effort and risk. There were no prior warning lamps, noises, reduced steering assist, or other symptoms before the failure. The malfunction was abrupt and occurred without any advance indication. The vehicle had approximately 39,000 miles at the time, which is well below what would reasonably be expected for a power steering rack failure. The vehicle was not modified or abused and was driven under normal conditions. Audi dealership confirmed failure of the electric power steering system and diagnosed the issue as a power steering rack failure requiring full replacement. The repair was completed only after the vehicle became unsafe to operate. The removed component may be available through the servicing dealer or Audi of America for inspection upon request, and I have retained all repair documentation. Audi of America was notified of this incident after the repair but declined responsibility. Based on subsequent research, I am aware of multiple similar reports involving Audi Q5 power steering failures. I am submitting to assist the federal safety agency in determining whether this issue poses a broader risk. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF I

Filed Dec 18, 2025 · Engine · NJ

Vehicle: 2018 Audi Q5 Prestige Mileage: Approximately 34,000 miles On December 14, 2024, while driving at normal road speeds, my vehicle suddenly lost power and displayed multiple warning messages, including drivetrain and system malfunction alerts. The vehicle became unstable and unsafe to operate while I was in traffic, forcing me to carefully maneuver off the roadway. This occurred without any prior warning or abnormal engine behavior, it was just so sudden. I brought the vehicle to an authorized Audi dealership the following day. After inspection, the dealership diagnosed a catastrophic internal engine failure, identifying a cracked/chipped valve in cylinder 3. The dealership technicians and service staff stated that this type of failure is extremely rare on a vehicle with such low mileage and normal maintenance history. They also indicated that they had not encountered this type of valve failure on a similarly maintained Audi vehicle at this mileage. There was no evidence of carbon buildup or abuse, and no external contributing factors were identified. The failure resulted in sudden engine malfunction and loss of drivability while the vehicle was in motion, creating a significant safety risk. The dealership recommended replacing the engine cylinder head, with an estimated repair cost approximately $9,100. The dealership could not confirm whether debris from the damaged valve remained in the engine or whether the repair would fully mitigate future safety risks. I am submitting this complaint due to concerns that this failure represents a potential manufacturing or materials defect that can lead to sudden engine malfunction or loss of power while driving, posing a safety hazard to vehicle occupants and other road users.

Filed Mar 16, 2025 · Airbags, Engine · PA

I have owned the car for 2 years, purchased a 2018 Q5 from an Audi dealer. Within the first year, my thermostat failed causing the car to lose power and turn off while driving with my newborn baby. I also received the passenger airbag alert daily, which I did see there was a recall for this prior to buying the car. I also received the “add a quart of oil” message about 3 months after an oil change. I would like this car to be reviewed for excessive oil consumption. At the times of these messages no oil leak was found. Now, my car went in for an oil change and an oil and transmission oil leak has been found. Within 2 years of owning a car that has had regular maintenance, I have spent over $6,000 on service and repairs, which is unusual. I need help.

Filed Feb 5, 2025 · Driver assistance, Steering · NY

While driving, the power steering completely went out and lost the ability to steer, while on the road. There were no prior warnings or feeling in the steering to present a possible future failure of steering under power. Put myself, my wife and the other operators at risk as I lost all power steering and had to pull over immediately. I have a current repair order open at a local shop and the PSM module has failed, of course requiring a full steering rack replacement to the tune of +$5k.

Filed Jul 18, 2024 · Acceleration, Electrical · WI

Car was left outside for two weeks while we were gone on a trip. When we returned and attempted to start the car numerous warning lights went off related to turn signals, tail lights, engine ignition, key recognition, etc. We were able to drive the car home but the turn signals and tail lights were malfunctioning and the engine would lose power unexpectedly. Upon researching on AudiWorld Forums I came to learn I should check to see if there was any moisture in certain areas, including the rear fuse box area at the rear of the car. I checked that location and found many inches of water in the fusebox!!! I learned that MANY, MANY people with q5s have had the same problem which is RAINWATER ENTERING THE VEHICLES ELECTRICAL SYSTEM DUE TO NON-OPERABLE SUNROOF DRAIN PORTS. Yes, I searched and found an unrelated recall 90s9 but the dealer said this was not the issue, the issue is non-operable sunroof drains and the repair cost is $8,000. Having no idea of the danger I was placing my family in by driving this vehicle while its electrical system was swamped with water, I feel a class action lawsuit should be brought against the company for damages for material, labor, as well as the risk of injury or death I placed my wife and I in by driving this vehicle under such unsafe conditions. I noted there was a suit settled for this issue with other models, but not the 2018 q5. [XXX] V Audi/Volkswagon [XXX] . The idea that someone should have to face death for leaving their car in the rain does not even pass the laugh test. Someone in Audi's risk management department needs to address this and make owners whole again. Please advise. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Mar 23, 2024 · Electrical · TX

-Car shut down (engine off, battery still functioning) while driving. Car went into neutral. -Lost power steering and other functions after about 20 seconds of the engine shutting down. -Immediate life-threatening danger while driving to us and surrounding drivers and pedestrians -no inspection or police report yet. -the car has not been driven since the incident and so the problem has not been reproduced yet. Upon inspection of the trunk area (2018 Audi Q5), we found about 4 inches of water. This has been attributed to clogged sunroof drains causing water to flow into the trunk and short out electrical components.

Filed Nov 17, 2018 · Transmission · 300 miles · NY

Purchased a 2018 audi q5 in july 2017. The engine lost power or acceleration when making a turn. Took it to the dealer 2 times for the same problem and cannot reproduce the problem.