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O2 sensor low voltage

Drifter60060

By Drifter60060
in Ask A GM Technician

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Drifter60060 New Member

Drifter60060

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Ok, I have a 97 GMC Sierra 1500 2wd. SES light came on with the code P0137and P0143, which I understand to be low voltage at the drivers side post-cat sensor. I checked the voltages as suggested and I have 12v at the sensor but I only had 387mA. My schematic shows pins 20 and 24 to be the wires for this sensor. I checked voltage there but couldn't get a reading. Would this suggest my PCM is going bad or should I look into the EGR solenoid?

  • 2 weeks later...
Drifter60060 New Member

Drifter60060

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That should read 387mV, not milliamps. So I guess the GM tech has never come across this problem. I guess I should just take it to a repair shop and pay the big bucks.

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