Engine Coolant Bypass Valve B Position Sensor Circuit

Where it lives

For P2AA7, start at the sensor the description names.

Check these first

• A failed coolant bypass valve B position sensor
• An open or short in the bypass valve B position sensor wiring
• A corroded bypass valve B position sensor connector
• A coolant leak through the bypass valve B sensor housing

What to do next

1. Scan all modules and read the bypass valve B position sensor voltage
2. Inspect the bypass valve B sensor connector for corrosion or coolant intrusion
3. Test the bypass valve B position sensor wiring for open and short faults
4. Compare the bypass valve B sensor reading to a known good valve
5. Replace the bypass valve B position sensor if the circuit is sound
6. Clear the code and retest

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