P0641 Chevrolet -

Question

Chevy dealer replaced ecm told me every ok. Light came on same day. They said it's not there problem. Need help please.

Answer 1

If the dealer told you replacing the ECM would fix the problem and it did not. You should call cadillac consumer affairs

(800) 458-8006

if the engine light is on there is a problen, the wiring has to be checked 

Possible causes

- Faulty Engine Control Module (ECM)

- ECM harness is open or shorted

- ECM circuit poor electrical connection

- Shorted sensor on 5 volt circuit