CT6 Battery Issues Cause Multiple Electrical Failures

Had the same battery failure symptoms on my 2019 XT5. The voltage drop was affecting multiple systems, difficult starts, unusual dashboard messages, and electrical gremlins throughout. Turned out the main battery was fine, but the auxiliary power system had a wiring issue near the trunk. The problem was causing parasitic drain and preventing proper charging cycles. Diagnosis revealed corroded terminals and a faulty voltage regulator. The repair needed specialized diagnostic equipment to properly trace the electrical faults. What seemed like a simple battery malfunction actually required replacing the voltage regulator, cleaning all connection points, and reprogramming several modules to resolve the engine start issues. This is a serious electrical system concern that should be addressed promptly to prevent potential system damage. These symptoms match yours exactly, the unusual error messages are typically the first sign of a failing power management system rather than just a weak battery. Would strongly suggest having it checked by a certified shop that specializes in electrical diagnostics, as general mechanics often miss the underlying causes of these complex battery-related issues.

Thanks for sharing that experience, it really helps since I have been dealing with an identical low voltage problem in my 2020 CT6 for weeks now. The battery malfunction symptoms you described match my situation perfectly. One quick question, do you remember roughly what the total repair cost came out to? Also curious if you have had any recurring electrical issues since getting it fixed? Would help me budget for what might be ahead.

After getting my XT5 properly diagnosed and repaired, I have not experienced any recurring battery malfunction issues. The car electronics are working flawlessly now, and the voltage drop problems were completely resolved. The total repair came to 290€ for fixing the auxiliary battery system, including parts and labor. This covered the voltage regulator replacement, terminal cleaning, and module reprogramming. While it may seem steep, proper car electronics repair requires specialized equipment and expertise. My advice paid off, getting it diagnosed by technicians who understand complex battery failure patterns saved money in the long run. Going on two years now without any electrical gremlins or starting problems. A proper fix for battery-related issues is worth the investment to prevent cascading electrical problems.

After dealing with ongoing electrical problems, I finally took my CT6 to a certified shop specializing in electrical diagnostics. The power management system diagnosis revealed exactly what was described, corroded terminals and a faulty voltage regulator causing the battery malfunction symptoms. The repair cost came to 310€, which covered a complete auxiliary battery system overhaul, including cleaning all connection points and necessary reprogramming. The repair took about 4 hours, but the results were worth it. Its been 3 weeks since the fix, and all the electrical issues have cleared up completely. No more error messages, the engine starts perfectly, and the voltage drop problems are gone. Really glad I asked for advice here first, saved me from another frustrating experience with a general mechanic who might have just replaced the battery without fixing the real issue.