O2 sensor bank 1 sensor 1 wiring diagram needed?

Tiny
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
Wednesday, January 8th, 2025 AT 8:28 AM

11 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 51,500 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
Tiny
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
Tiny
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
Tiny
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
Tiny
KEN L
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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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Tuesday, January 14th, 2025 AT 10:06 AM
Tiny
STARRPAT76
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I've checked wiring to o2 sensor no brakes. I'm getting 12volts on heater circuit i've got 9.3 resistance on o2 sensors heater I cleaned contacts on PCM but still getting trouble codes.
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Wednesday, January 29th, 2025 AT 5:52 AM
Tiny
KEN L
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I would send the PCM for testing, it sounds like it is bad.
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Wednesday, January 29th, 2025 AT 8:43 AM
Tiny
STARRPAT76
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Where can I take it to or send it to?
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Wednesday, January 29th, 2025 AT 9:00 PM
Tiny
KEN L
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I would search google or ebay.
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Thursday, January 30th, 2025 AT 12:00 PM
Tiny
STARRPAT76
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I still haven't got my truck fixed. I have been able to work on lately will let you know what the problem is when I figure it out. Thank you for your help.
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Wednesday, February 26th, 2025 AT 12:41 PM
Tiny
KEN L
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No problem, have a nice weekend!
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Thursday, February 27th, 2025 AT 10:33 AM

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