Description of DTC code P2237

To monitor the amount of oxygen in the exhaust and verify the efficiency of the Catalytic Converter (TWC), the Powertrain Control Module (PCM) relies on the input from the Oxygen (O2) Sensors. This sensor is located in the exhaust manifold, and detects the oxygen in the exhaust gas, comparing it with the outside air.

DTC P2237 OBD2 indicates that the PCM has encountered a positive current mismatch on bank 1 O2 sensor number 1. The positive current control circuit is a low voltage circuit.

Symptoms of fault code P2237

  • The Check Engine light illuminates.
  • Reduced fuel efficiency.
  • Stored rich ignition or exhaust fault codes.

Causes of OBD2 P2237

Causes for setting the P2237 OBDII diagnostic code:

  • Oxygen Sensor 1 located on bank 1 may be defective.
  • Cables or connectors related to the O2 Sensor may be damaged.
  • Perhaps the Oxygen Sensor heater circuit may be open.

Possible solutions of the DTC code P2237

Steps to solve the faults associated with the P2237 OBD2 trouble code:

  • Check the Oxygen Sensor cables and connectors for damage such as burns, wear, or corrosion. If they have such damage, repair or replace them as necessary.
  • Check with a DVOM the resistance between the positive current control circuit with the ground. If there is continuity, the O2 Sensor may be defective.
  • Start the engine and allow the engine to reach the operating temperature, then observe the input data from the Oxygen Sensor with a scanner. The sensor voltage should be between 1 and 900 mV, but it will stabilize and remain stable. If not, the sensor is defective, replace it.

Codes related to P2237

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