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O2 High voltage, it appears to have 4 new O2 sensors and 2 new cats?

Tiny
SMIRO
  • MEMBER
  • 2014 RAM 1500
  • 5.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 129,000 MILES
I bought the truck, and it appears to have 4 new O2 sensors and 2 new cats. Check engine light on and even after being reset comes back on. I was told that it probably has a computer issue. I ordered a refurbished computer that was programmed to the truck and ended up with more codes than originally had so I was able to send it back. All 4 O2 sensor codes are saying high voltage.

So, this is what my code reader brings up:

Stored codes
P1128
P1129
P0132
P0138
P0152
P0158

Pending codes
P1128
P1129
P0132
P0138
P0152
P0158

Permanent codes
P1128
P1129
P0132
P0152
P0138
P0158
P0038
P0032

Thanks in advance for any help.
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Wednesday, August 23rd, 2023 AT 2:12 PM

9 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,924 POSTS
This is a PCM issue, I would try another place for a rebuilt PCM. here is how the job is done correctly if you need it. Also, this guide can help:

https://www.2carpros.com/articles/how-to-replace-a-vehicles-main-engine-computer-pcm-ecm-ecu

Check out the images (below). Please let us know if you need anything else to get the problem fixed.

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Thursday, August 24th, 2023 AT 12:14 PM
Tiny
SMIRO
  • MEMBER
  • 6 POSTS
I don't believe it's a PCM issue because even with the reman PCM, the original O2 codes still showed up. That PCM had other codes that the truck had no issues with.
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Thursday, August 24th, 2023 AT 12:50 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,924 POSTS
Can you clear the codes and then turn the key on without starting the engine and re-run the codes please?
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Friday, August 25th, 2023 AT 11:42 AM
Tiny
SMIRO
  • MEMBER
  • 6 POSTS
This was just done fresh cleared codes.
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Friday, August 25th, 2023 AT 11:54 AM
Tiny
SMIRO
  • MEMBER
  • 6 POSTS
I started it and let it run for a few minutes. I shut it off and plugged the scan tool back in. I wanted to send live data pics as well but before the scan tool got to the live data screen, all stored, pending, and permanent codes are on the scanner again.
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Friday, August 25th, 2023 AT 12:07 PM
Tiny
SMIRO
  • MEMBER
  • 6 POSTS
After achieving warm temperature, live data.
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Friday, August 25th, 2023 AT 12:18 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,924 POSTS
Thanks for the images, it sounds like the PCM is bad, but to be sure let's check the power and grounds. This guide can help, and I have included the wiring diagrams for the PCM so you can see which wires to test and how the system works.

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

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Saturday, August 26th, 2023 AT 11:00 AM
Tiny
SMIRO
  • MEMBER
  • 6 POSTS
Apparently there is a compatibility issue with aftermarket sensors. Replaced all 4 with OEM sensors and the issues were all fixed.
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Saturday, September 16th, 2023 AT 9:54 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,924 POSTS
Glad you could get it fixed, thanks for letting us know. Please use 2CarPros anytime we are here to help.
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Monday, September 18th, 2023 AT 10:58 AM

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