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Oxygen sensor DTC P0036 will not go away.



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Have you check your wiring real close? If not double check it.


P0036 GM’s Definition


HO2S heater control circuit sensor 2

– The ECM detects an open in the heater circuits of the HO2S when the heater is commanded off


Probable Cause


1. Poor electrical connection

2. Open or short circuit condition

3. HO2S

4. ECM




P0036 Generic Definition


O2 (Oxygen Sensor) Heater condition-Check repair resource for sensor location identification

– The powertrain control module controls the electrical circuit for the oxygen sensor heater. The computer has recognized a failure in this circuit.


Probable Cause


1. Check circuit fuse

2. Relay defective

3. Check circuit wiring

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