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

2014 RAM 1500

129,000 MILES • 5.7L • V8 • 4WD • AUTOMATIC

SMIRO

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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.

Aug 23, 2023 at 2:12 PM

STRAILER

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53,872 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.

Images (Click to enlarge)

Aug 24, 2023 at 12:14 PM

SMIRO

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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.

Aug 24, 2023 at 12:50 PM

STRAILER

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Can you clear the codes and then turn the key on without starting the engine and re-run the codes please?

Aug 25, 2023 at 11:42 AM

SMIRO

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6 POSTS

This was just done fresh cleared codes.

Images (Click to enlarge)

Aug 25, 2023 at 11:54 AM

SMIRO

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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.

Images (Click to enlarge)

Aug 25, 2023 at 12:07 PM

SMIRO

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After achieving warm temperature, live data.

Images (Click to enlarge)

Aug 25, 2023 at 12:18 PM

STRAILER

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53,872 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

Check out the images (below). Please let us know what happens.

Images (Click to enlarge)