Question

On my 1998 Chevrolet Cavalier with engine code p1621, how to repair?

Answer 1

Hi there,

This code means the pcm cannot communicate internally. To resolve the problem it will either need to be reprogrammed or replaced.

Answer 2

P1621 CHEVROLET - Control Module Long Term Memory Performance Condition
Read more: https://www.autocodes.com/p1621_chevrolet.html