Diagnostic Aids

The following conditions may cause this DTC to set:

• Poor connection or poor terminal tension at the sensor.
• Crankshaft reluctor wheel damage or improper installation.
• Excessive air gap between the CKP sensor and the reluctor wheel.
• The engine running out of fuel.
• Foreign material passing between the sensor and the reluctor wheel.

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 INTERMITTENTS in TROUBLE SHOOTING - NO CODES - 4.3L ASTRO, BLAZER, JIMMY CANADIAN, SAFARI, SONOMA & S10 PICKUP article.