Frontier Electrical Problems Overvoltage

Whoa, sounds familiar! I had a similar problem with my Frontier not too long ago. Overvoltage codes popping up left and right. Check your battery terminals first; make sure they're clean and tight. A loose connection can cause some seriously weird electrical gremlins. Also, give the alternator a good once-over. How old is your battery? That's where I'd start, did you check your car battery?

Thanks for the quick response! The battery terminals seem fine, I cleaned them a few weeks ago. The battery is probably about 4 years old, so not brand new, but not ancient either. When you had the issue, did replacing the battery solve the problem, or was there more to it? I want to avoid just throwing parts at it and potentially damaging more sensitive components.

Yeah, I hear you about not wanting to just replace parts willy-nilly. In my case, it ended up being a bad voltage regulator in the alternator. If your battery is only 4 years old, that could still be the issue. Given the overvoltage codes and system failures, you might want to get it scanned professionally. A workshop should be able to pinpoint it pretty quickly and avoid further damage.

Appreciate the insights! I took your advice and brought it to the workshop. You were right, the alternator was faulty and caused the overvoltage which resulted in a cascade of errors. They replaced the alternator and checked the battery, the final repair cost was 290€. Everything is working fine now. Thanks again for pointing me in the right direction!