2012 Grand Cherokee 3.6L P0058 O2 sensor and P0113 IAT codes

Blaze

The Jeeper Reaper
Joined
Aug 9, 2005
Location
Wake Forest, NC
Working on my brother's 2012 Grand Cherokee 3.6L. It was throwing a P0058 O2 sensor code and a P0113 IAT code. It was at the age where the O2 sensors were probably older anyway so I went ahead and replaced the rear pair and cleared the codes, but the code came back before it was even fired up. I checked wiring, seems all good. IAT sensor code went away after replacing but it immediately came back after starting.

A mechanic told him it might be PCM but they also told him it was overheating because it needed a new engine and it was just a bad water pump. Now I'm wondering if maybe it does need a PCM since it is throwing random circuit codes. What does everyone think?
 
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