Crankshaft Position Sensor B Circuit High

Where it lives

For P0388, the sensor sits on the circuit this code reports. The description of P0388 reports a fault at the sensor.

Check these first

• Faulty crankshaft position sensor B
• Open or shorted wire in the CKP sensor B circuit
• Corroded connector at CKP sensor B
• Damaged crank pulley or tone ring upsetting sensor B
• Low battery voltage skewing the sensor B signal

What to do next

1. Check the CKP sensor B connector for corrosion
2. Test the CKP sensor B circuit for opens and shorts
3. Inspect the crank pulley and tone ring for damage
4. Read the CKP sensor B signal while cranking
5. Replace crankshaft position sensor B if the signal is wrong
6. Clear the code and retest

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