What are the common causes of P00B6?

A radiator coolant temperature sensor that reads off from the engine sensor. A failed engine coolant temperature sensor. Air pockets leaving one sensor dry. A thermostat stuck partly open. Corroded wiring on either sensor circuit.

Compare radiator and engine coolant temperature after a cold start. Bleed the cooling system to remove air pockets. Inspect both sensor connectors and wiring for corrosion. Test the thermostat if the two readings diverge warm. Replace the sensor that reads off from the other. Clear the code and retest.

P00B6

Radiator Coolant Temperature/Engine Coolant Temperature Correlation

System: Fuel and air metering (P code)
Lamp: Check Engine Light
Category: Powertrain - Fuel/Air Metering

What it means

P00B6 means Radiator Coolant Temperature/Engine Coolant Temperature Correlation.

Check these first

A radiator coolant temperature sensor that reads off from the engine sensor
A failed engine coolant temperature sensor
Air pockets leaving one sensor dry
A thermostat stuck partly open
Corroded wiring on either sensor circuit

What to do next

Compare radiator and engine coolant temperature after a cold start
Bleed the cooling system to remove air pockets
Inspect both sensor connectors and wiring for corrosion
Test the thermostat if the two readings diverge warm
Replace the sensor that reads off from the other
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.