P0641 Chevrolet -

Question

Two codes PO101, PO641
Replaced Mass Air Flow Sensor, Throttle body & sensor, spark plug wires. Starts cold, idles rough, warms up & drive around it cuts out a couple of times while driving. Spent over $400 this weekend between parts & tests. That's half my paycheck. Can someone help?

Answer 1

Hi there

This particular code means there is an issue with the 5 volt reference circuit in the ecm. Most of the time the issue is the ecm itself.

P0641 CHEVROLET - 5 Volt Reference Voltage Incorrect

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