P0604 BUICK – Control Module Random Access Memory

P0604 BUICK Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light),Engine may not start

P0604 BUICK Possible Causes

Faulty Powertrain Control Module (PCM),PCM harness is open or shorted,PCM circuit poor electrical connection,PCM Programming

P0604 BUICK Description

The Powertrain Control Module (PCM) performs an internal self-test on it’s Random Access Memory (RAM) or read/write memory. If this self-test fails, the P0604 code will set.