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Home › Cadillac › 2001 › DeVille Base › Repair and Diagnosis › Engine Performance › System › Engine Control System - Self-Diagnostics - 4.6L › Diagnostic Tests › DTC P0604: Control Module Random Access Memory › Diagnostic Procedures

Diagnostic Procedures

  1. If powertrain diagnostic system check has already been performed, go to next step. If powertrain diagnostic system check has not been performed, go to POWERTRAIN DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
  2. Replace PCM. Program replacement PCM. See PROGRAMMING .
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