Motor Electronics Coolant Temperature Sensor B Circuit Range/Performance

Where it lives

For P2BD9, the part to look at first is the sensor named here.

Check these first

• A coolant temperature sensor B signal that does not track engine temperature
• An intermittent connection at sensor B that skews the reading
• A sensor B element that reads slow or erratically as it warms
• A thermostat stuck open that keeps actual coolant temperature low

What to do next

1. Read coolant temperature sensor B against a cold soak baseline
2. Watch sensor B live data through a full warm up cycle
3. Check the sensor B connector for an intermittent fit
4. Compare sensor B to the cylinder head temperature reading
5. Replace coolant temperature sensor B if its output stays skewed
6. Clear the code and retest

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