Diagnostic Aids

WARNING: This page is about a different car, the 2002 Pontiac Grand Am, 2002 Oldsmobile Alero, 2002 Chevrolet Monte Carlo, and 2002 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.

DTC P1374 can be caused by secondary components leaking high voltage into the IC module.

Check for any of the following conditions:

Incorrect harness routing near secondary ignition components.
Ignition coil arcing to wiring harness or IC module Inspect the ignition coils for cracks, carbon tracking and other signs of damage.
Secondary ignition wires arcing to the wiring harness.
If the DTC is determined to be intermittent, see INTERMITTENT CONDITIONS under SELF-DIAGNOSTIC SYSTEM.