OBD-II Trouble Code Description for P0137 GMC

O2 Sensor Circuit Low Voltage

What does this mean?

OBD2 Code P0137 GM definition:
Essentially the same as P0136 GM, P0137 GM definition:the second oxygen sensor on Bank 1. P0137 GM means the O2 oxygen sensor’s voltage remained low for longer than 2 minutes. This, is interpreted by the ECM as a low voltage condition and sets the MIL. Bank 1 Sensor 2 is located to the rear of the catalytic converter and should produce an output signal relative to oxygen storage capacity of the catalytic converter. This rear (sensor 2) sensor is less active than the signal produced by the front sensor. However, if the ECM senses the sensor is inactive, this code will set.

Symptoms

Possible sumptoms of OBD code P0137 GM
There may be no visible symptoms to the driver, other than the MIL (Check Engine / Service Engine Soon) illumination.

Causes

Possible causes of OBD code P0137 GM
A code P0137 GM may mean that one or more of the following has happened: Faulty o2 sensor Exhaust leak near the rear sensor Plugged catalyst Short to voltage on O2 signal circuit High resistance or open on O2 signal circuit

Possible Solutions

Replace faulty sensor Repair exhaust leak near the rear sensor Check for restriction in catalyst and replace as necessary Repair short, open, or high resistance on o2 signal circuit