Codes U1016, U1040, C0035 and P0303, where is the PCM located?

JEREMY DAVIS

MEMBER
2003 BUICK RENDEZVOUS
150,000 MILES

How do I know why it lost communication with the PCM? Made a right turn and the transmission stopped working when you start the car it works for a couple seconds then quits working again had code u1016 loss communication with power train control module and also u1040 loss power of electronic brake control module c0035 left front wheel sensor malfunction p0303 engine misfire detected those were all the codes found.

1 Reply

KEN L

MASTER CERTIFIED MECHANIC
42,840 POSTS

This can be the ignition switch going out, have you checked all fuses for power?

here is a guide that will help us get started and the fuse locations as well:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Here is the location of the PCM as well so you can check the electrical connectors.

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