Getting code P1631 Alternator "T" Open Or No Power Output (1.8)--

Hi, this is Bo, an auto expert on RepairPal's Car Genius team! In this case, the "T" stands for TERRIBLE! The "T" in the P1631(CAN Timeout - ECM - Manual and Automatic Transmission) code likely refers to the alternator's "T" terminal, which is a connection used for communication with the vehicle's computer system. Despite the alternator testing well at the auto store, there may still be an issue with the wiring or connections related to the "T" terminal. Check the wiring harness, connectors, and fuses associated with the alternator's "T" terminal for any signs of damage or corrosion. Also, ensure that the terminal itself is properly connected and not loose. Don't rule out the ECM as well. Consult a professional mechanic or an automotive electrician to accurately diagnose and repair the issue. If you have any other questions, please call us at 877-913-1554! We'll gladly find you a certified RepairPal shop in your area!