Engine Coolant Bypass Valve C Position Sensor Circuit Low

Where it lives

For P23C4, the description names the sensor as the part involved.

Check these first

• A short to ground on the bypass valve C position signal wire
• A failed bypass valve C position sensor
• Coolant or oil contamination in the sensor connector
• An open in the sensor reference voltage feed

What to do next

1. Read bypass valve C position on a scan tool
2. Test the C position signal wire for a short to ground
3. Check for reference voltage at the sensor C connector
4. Inspect the connector for coolant or oil intrusion
5. Replace the bypass valve C position sensor if the circuit tests good
6. Clear the code and retest

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