Diagnostic Aids

WARNING: This page does not describe the selected car, but rather 13 other vehicles, including the 2003 Hummer H2, 2003 GMC Yukon XL, 2003 GMC Yukon, 2003 GMC Sierra, and 2003 GMC Cab & Chassis Sierra. However, it is still accessible from the selected car via links, so may be relevant.

The following conditions may cause this DTC to set:

Excessive air gap between the CKP sensor and the reluctor wheel.
Crankshaft reluctor wheel damage or improper installation.
The CKP sensor coming in contact with the reluctor wheel.
Foreign material passing between the CKP sensor and the reluctor wheel.
Insufficient fuel.

Excess crankshaft end play causes the CKP sensor reluctor wheel to move out of alignment with the CKP sensor. This could result in any one of the following:

A no-start.
A start and stall.
Erratic performance.

For an intermittent, see INTERMITTENT CONDITIONS under SELF-DIAGNOSTIC SYSTEM.