2011 Mainstreet 3.6L V6 2WD Limp mode/battery light

[connorsloan123]

Recently I started up the car, and saw I had a battery light on the dash. I figured my battery was starting to go bad, so I didn't take it too urgently at first, but then the next time I drove it, it had trouble starting and then went into limp mode when it finally did turn over. I did some diagnostic checks, including checking the belt, the battery and alternator terminals, all electrical connectors and wiring harnesses coming off of the battery and alternator, checked the condition of all the pulleys, and all of those things listed were in good/functioning condition (except for AC compressor pulley/clutch, which I replaced thinking it may have been the issue, but it didn't fix anything). I've had both the alternator and battery tested and both are good. I have no idea what the issue is. There's no corrosion on any terminals or wires or electrical connections, and everything seems to be in good shape. My next plan was to start checking fuses, especially fuse #179 and see if maybe its my IBS. Anybody have similar experiences or have any insight? Any help at all would be greatly appreciated

[John/Horace]

Whick engine is it, any recent work done on car. Miles on car?  Check for codes, even if no mil on. The ecm is what regulates alternator charging circuit through the TIPM module. Your year I believe had problems with tipm acting up, causing horn random honks, no starts etc.

 

Trouble starting means slow turning over, only clicking ? CPS sensor can cause random no starts, a wear item really.

Edited December 24, 2025 by John/Horace