Corvette Z06 Forum banner
1 - 1 of 1 Posts

·
Registered
Joined
·
17,744 Posts
P1637 is set when the PCM detects an out of range voltage on one of the output drive modules. P1638 is set when the alternator field winding pulse width modulation duty cycle exceeds 65 percent for over 5 seconds. These could have been caused by a high charge rate for a new battery or a low battery, maybe. I would reset the codes and see if they return. :z:

.
 
1 - 1 of 1 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top