Replace the power relay for the heater circuit due to a burned out or shorted circuit that the pinpoint test indicated.Īdditional comments for consideration regarding the P2237 codeĬode P2237 is caused most commonly from an internal failure of the heater circuit inside the O2 sensor.Repair the wiring connector or wiring to the O2 sensor.Replace the O2 sensor for an open circuit in the heater circuit.This will also cause the vehicle to fail emissions testing. This will cause the fuel feedback control to not work and the ECM to put the engine into failure mode. Tests the O2 sensor wiring is not shorted to the power relay or ground.Ĭhecks the wiring harness for shorts or open circuits from the O2 sensor to the ECM.Ĭommon mistakes when diagnosing the P2237 code?Ĭlearing ECM memory codes before checking the freeze frame data for the main failure problem, so the failure may be duplicated and repairedįailing to verify the failure before replacing the O2 sensorĬode P2237 is a code indicating the O2 sensor heater circuit is open or shorted causing the circuit voltage control to be open. Scans for codes and documents the code in the ECM and looks at the freeze frame data for failure.Ĭhecks the O2 sensor heater circuit compared to the other O2 sensors to be the same voltage input and control voltages.Ĭhecks the O2 heater circuit for open or short circuit in the sensor. How does a mechanic diagnose the P2237 code? The engine may have different drivability symptoms depending on the manufacture failure mode controls. The ECM may go into failure mode fuel control on most manufacturer vehicles. The ECM will turn off the Check Engine light if three drive cycles pass without another failure. The Check Engine light will be illuminated and the code is set in ECM memory as a fault. The wiring or connector for the O2 sensor has an open circuit or corrosion in the connections.The heater power relay is shorted to the O2 sensor circuit ground.The O2 sensor has an open circuit in the heater circuit internal of the sensor.The ECM tests the sensor circuit after the engine is warmed up. P2237 is an OBD-II generic code for the engine control module (ECM) detecting the O2 sensor for bank 1 sensor 1 and has an open circuit for the heater control circuit of the O2 sensor.
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