SQ7 Electrical Chaos: Voltage Regulator Alert

I had a very similar issue with my S6 (2019 model) last winter and can share some insight based on my experience as someone with moderate car electronics knowledge. Started with similar symptoms, weak starts and unusual electrical glitches. Initially thought it was just a dying car battery, but the situation was more complex. The voltage regulator was indeed causing power surges that were affecting multiple systems and slowly damaging the car ECU. Took it to a workshop where they ran a complete electrical diagnostic. The testing revealed that the alternator was actually overcharging the battery due to a faulty voltage regulator, causing the battery to deteriorate prematurely. The repair cost me 290 Euro, which included replacing both the voltage regulator and the damaged battery. The fix completely resolved all electrical issues and the car has been running perfectly since then. However, to provide more specific advice for your case, could you share: Build year of your SQ7, Current mileage, When did these symptoms first appear, Are the issues more noticeable during cold starts, Have you noticed any warning lights on the dashboard This information would help determine if your situation matches what I experienced and whether the same solution might work for you.

I have the same SQ7 and had this fixed during my last service at 6031 KM. The alternator failure caused similar symptoms, the electrical system was acting erratically due to voltage spikes. The workshop found multiple overvoltage warnings in the car ECU logs, just like yours. They confirmed the voltage regulator was defective and replaced it along with the worn battery. Total repair came to 340 Euro and resolved all the electrical issues completely.

Thanks for sharing those details about your SQ7 repair. The symptoms and solution match exactly what I encountered with my S6. These power surge issues with the voltage regulator seem more common than we might think, especially in newer models with complex car electronics. After my repair, I started monitoring the battery voltage through an OBD reader just to catch any potential overvoltage issues early. Its been stable at normal levels since the fix, with no more unusual electrical glitches or weak starts. For anyone else reading this thread with similar car ECU warnings: getting this fixed promptly is crucial. The constant power surges can damage expensive electronic components if left unchecked. The repair cost might seem high, but its much cheaper than replacing multiple damaged modules later. The voltage regulator replacement really is the key fix here, just replacing the battery alone wont solve the underlying issue since the alternator will keep overcharging any new battery you install.

Good to hear you got it fixed! After comparing my experience with yours, it seems the voltage regulator problem is a known weak point in these models. The repair cost was similar too, I paid 340 Euro compared to your 290 Euro. The alternator failure symptoms were identical, with the circuit protection systems logging those overvoltage warnings in the car ECU. What convinced me it was the right diagnosis was how the power surges stopped completely after the voltage regulator replacement. This matches your experience perfectly. I also noticed the workshop mentioned seeing similar cases, suggesting its not an isolated issue. For reference to help others: the key warning signs were the weak battery despite being relatively new, unusual electrical glitches, and those consistent high voltage errors in the diagnostic logs. Getting it fixed early definitely prevented more extensive damage to other electrical components.