Meaning

The engine control module has detected that the crankshaft position (CKP) sensor signal is consistently above the maximum allowed threshold. The circuit exhibits excessive voltage or signal amplitude, indicating a short to power, external voltage induction, or an internal sensor failure.

Common causes

• CKP sensor signal wire shorted to supply voltage (battery or reference)
• Faulty CKP sensor with abnormally high voltage output
• Induction from adjacent high-voltage wiring (ignition, alternator)
• Sensor connector swapped with another circuit
• Defective internal pull-up resistor in the ECM
• Moisture contamination in the connector creating a resistive path to supply

Symptoms

• Check-engine light (MIL) illuminated
• No-start or hard-start condition
• Engine stalls while driving
• Possible fixed or implausible RPM reading on the instrument cluster
• Injection and ignition disrupted or disabled

Severity

What to do

1. Measure voltage on the CKP signal wire with ignition ON and engine stopped
2. Check for short to supply voltage on the signal wire
3. Inspect wiring insulation against adjacent high-voltage circuits
4. Check the connector for moisture, corrosion, or internal short circuits
5. Replace the CKP sensor if wiring is found serviceable

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