|Trouble Code||Fault Location||Probable Cause|
|P0621||Alternator warning lamp -circuit malfunction||Wiring, alternator warning lamp, ECM|
We recommend Torque Pro
BAT Team Discussions for P0621
- 2001 impala battery dies every few days
Some thoughts came to me ... and worth adding... if you move the key to off position and remove BEFORE you place shifter in P the system goes AFU. Can remove key and walk away there is still power where it should not be... Can you did you check for B series codes? would you need a diagram- ...