O2 sensor bank 1 sensor 1 wiring diagram needed?

STARRPAT76

MEMBER
2011 CHEVROLET COLORADO
2.9L
4 CYL
2WD
AUTOMATIC
215,000 MILES

Have replaced sensor 3 times getting a sensor inactive code best I can tell only getting 0.47 volts to sensor can't find out what voltage is supposed to be coming to sensor. If I could find the correct wiring diagram it would help. Any tips on fixing this problem would be appreciated. Thank you

5 Replies

KEN L

MASTER CERTIFIED MECHANIC
48,969 POSTS

The heater circuit for the O2 sensor receives 12V from a fused power source and a ground signal from the PCM. The sensor generates its own voltage (between 0.1V to 0.9V) based on the oxygen levels in the exhaust. Here are the wiring diagrams and a guide to help you test the continuity from the sensor to the PCM.

https://www.2carpros.com/articles/how-to-check-wiring

Check out the images (below). Let us know how it goes.

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Thursday, January 9th, 2025 AT 11:35 AM

STARRPAT76

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Yes I believe it's going to be helpful, but our weather has been bad here an haven't been able to try it.

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Sunday, January 12th, 2025 AT 3:31 PM

KEN L

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Oh ya, that is common, please let me know when the weather lets up and you can check it :)

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Monday, January 13th, 2025 AT 1:07 PM

STARRPAT76

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I pulled the trouble codes today I've got p2a00, p0134, and this is a new one p0053 it seems that every time I pull the codes there's always one new one.

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Monday, January 13th, 2025 AT 2:12 PM

KEN L

MASTER CERTIFIED MECHANIC
48,969 POSTS

Yep, I would check the wiring to the PCM and if okay it sounds like the PCM is bad.

P0053 - HO2S Heater Resistance Bank 1 Sensor 1
P2A00 - O2 Sensor Circuit Performance Bank 1 Sensor 1
P0134 - O2 Sensor Circuit No Activity Detected Bank 1 Sensor 1

If the wiring is okay here is how to change the PCM out, you can get a preprogrammed unit by searching Google or Ebay. Check out the images (below). Please let us know what happens.

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