P0621 Chevrolet -

Question

Error code p0621. Battery good. new alternator put in.still won't start.

Answer 1

Hi there,

This code indicates an issue with the alternator. If it's good, it could be a wiring problem. Here is some info for you.

P0621 CHEVROLET - Generator Lamp L Control Circuit Malfunction

Read more: https://www.autocodes.com/p0621_chevrolet.html