Diagnostic Aids
WARNING: This page does not describe the selected car, but rather 13 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Sierra, 2002 GMC Savana Special, 2002 GMC Savana Camper Special, and 2002 GMC Savana. However, it is still accessible from the selected car via links, so may be relevant.
The following problems may cause this DTC to set:
- Poor connections.
- Crankshaft reluctor wheel damage or improper installation.
- Excessive air gap between the sensor and the reluctor wheel.
- The engine running out of fuel.
- If the crankshaft rotates backwards, this DTC sets. This condition is only with vehicles equipped with a manual transmission. This condition can occur when a vehicle is on an incline and the clutch is released and an engine stall occurs.
- Foreign material passing between the sensor and the reluctor wheel.
Excess crankshaft end play will cause the CKP sensor reluctor wheel to move out of alignment with the CKP sensor. This could result in any one of the following conditions:
- A no-start.
- A start and stall.
- Erratic performance.
An improperly installed crankshaft could cause excess crankshaft end play.
For an intermittent, see INTERMITTENT CONDITIONS under SELF-DIAGNOSTIC SYSTEM.