Diagnostic Aids

WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

This DTC will only set at idle.
An improperly torqued harmonic balancer or improperly built engine will set this DTC.
PCM will disable the ability to command the variable cam phaser on scan tool. This will prevent engine damage from excessive valve overlap.