Battery not charging

Hey, my name is Dusty, and I'm one of the auto experts on RepairPal's Car Genius team. I'm here to help! Hey there! It sounds like you’ve already put in a lot of effort trying to resolve the battery charging issue on your Envoy. First, ensure that the battery itself is in good condition; sometimes, a bad battery can cause charging issues, and even if the alternator works fine, it'd be worth having it load-tested for verification. If you've checked all associated wires and found nothing obvious that could cause a problem, next, look at the serpentine belt that drives the alternator. If the belt is loose, worn, or slipping, the alternator might not be spinning fast enough to charge the battery effectively. Relays and additional control modules can also play a role. The powertrain control module (PCM) or engine control module (ECM) manages the charging system in many vehicles. If the module is faulty, it might not signal the alternator to charge correctly or at all. Checking for trouble codes with an OBD-II scanner can reveal whether there is a control module issue. If the issue is unidentified, consider having a professional technician conduct a comprehensive diagnostic for modern vehicle electrical systems. They have the tools and expertise to track down electrical gremlins that can be tricky to pinpoint. Taking these steps should help you resolve your charging issue and ensure your Envoy runs reliably. If you have any other questions or would like help finding a RepairPal Certified shop in your area, call us! 877-913-1554