Diagnostic Aids

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

Inspect for the following conditions:

• Incorrect harness routing near secondary ignition components.
• Ignition coil arcing to wiring harness or IC module. Inspect the ignition coils for the following conditions: 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 INTERMITTENTS in TROUBLE SHOOTING - NO CODES - 3.4L MONTANA, SILHOUETTE & VENTURE article.