Q4 e-tron Sudden Shutdowns: HV System Warning Alert

Had the same electrical fault on my 2018 Audi e-tron. The symptoms started identically, sudden power loss and system malfunction warnings. Initial diagnosis revealed a serious battery drain issue affecting the high-voltage system. The root cause was cable damage between the main battery pack and the voltage sensor unit. The insulation had worn down, creating intermittent connection issues. When the connection failed, the safety system triggered an emergency power reduction. This required extensive testing since the battery drain was inconsistent. The repair involved: Complete diagnostic scan of the high-voltage system, Replacement of the damaged cable harness, Recalibration of voltage sensors, Full system reset The repair was significant since it involved the main power system. Working on high-voltage components requires specialized equipment and expertise. A certified EV technician needed to handle the repairs due to safety protocols. Important to note: Continuing to drive with these symptoms risks further damage to the power management system. Have a specialized EV shop check the cable connections and voltage monitoring system. Regular battery health checks can prevent similar issues.

Thanks for sharing your experience. The electrical wiring fault and voltage sensor issues sound exactly like what I am dealing with. The system malfunction symptoms match perfectly. How much did you end up paying for the complete repair work? Also curious if you had any recurring battery drain problems after getting it fixed? Would really appreciate knowing the final cost since I need to budget for potential repairs, especially if the high-voltage system needs major work.

Glad I could help identify the issue. After taking it to the certified EV technician, the high-voltage system error message has completely disappeared. The total repair cost came to 290 Euro to fix the heavily discharged battery condition. The voltage sensor and electrical fault diagnosis revealed a simpler problem than initially feared. Since the repair, the system malfunction warnings have not returned, and the battery performance is back to normal. No more unexpected power drops or cable damage concerns. Regular battery monitoring shows everything working as intended now. If your symptoms match what I experienced, the repair costs might be similar, though prices can vary based on the exact issue found during diagnosis. The investment was worth it for peace of mind and proper system function. Just make sure to use a technician certified for high-voltage system repairs.

Thanks everyone for the helpful insights. After reading about similar EV problems, I took my Q4 to a certified EV specialist last week. The inverter issue turned out to be caused by a faulty voltage sensor unit. The repair involved replacing the sensor assembly and recalibrating the power management system. Total cost was 340 Euro which included a full diagnostic scan. Since the fix, no more battery warning messages or sudden power drops. The electrical fault has been completely resolved. Regular system checks show everything running smoothly now. Really glad I got this sorted by a proper EV technician rather than continuing with the first mechanic who seemed unsure about diagnosing high-voltage systems. Worth the investment for proper diagnosis and repair.