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Home › Chevrolet › 2001 › Impala LS › Repair and Diagnosis › Engine Performance › System › Engine Control System Self-Diagnostics - 3.8L › Diagnostic Tests › DTC P1640: Output Driver Module Circuit No. 1 › Code Enable Criteria

Code Enable Criteria

Ignition is on.

DTC sets when ODM has detected a voltage more than 33 volts or excessive current is detected on any circuit to ODM for 30 seconds.