Engine Coolant Bypass Valve C Position Sensor Circuit High

Where it lives

For P23C5, the part to look at first is the sensor named here.

Check these first

• A short to voltage on the bypass valve C position signal wire
• An open in the bypass valve C position sensor ground
• A failed bypass valve C position sensor
• A poor connector pin fit at the sensor C

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 voltage
3. Check the sensor C ground circuit for an open
4. Wiggle test the C connector pins for poor contact
5. Replace the bypass valve C position sensor if the wiring tests good
6. Clear the code and retest

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