P0138 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


OBD-II Trouble Shooting Got a code reader? Find out what your GM car's Check Engine light is trying to tell you (and then turn Check Engine light off).

 
 
 
 
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Old 09-24-2009, 12:18 PM   #1
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Default P0138

P0138

Description
HO2S 2 CIRCUIT VOLTAGE HIGH

Three-Way Catalyst (TWC) system is used to control emissions.
PCM uses signal from Heated Oxygen Sensor (HO2S) behind TWC to read
efficiency of TWC. PCM will set DTC P0137 if TWC oxygen storage
capacity is less than a predetermined threshold.

Symptoms
There may be no noticeable symptoms except for MIL light. Engine might be running rich.

Causes
  • Faulty O2 sensor
  • Short to battery voltage in O2 sensor signal circuit
  • High fuel pressure
Possible Solutions
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obd2, obdii, p0138, p138

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