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Discussion Starter · #1 ·
A couple of months back, 2005 Wrangler automatic transmission went into limp mode with service engine light. Codes were P0700 (Automatic transmission control system malfunction) and P0891 (A/T TCM Relay always on). I could not find a TCM so I pulled mine and sent off for refurbishment. It was returned and the jeep ran fine for two months. The same thing has happened so I pulled the TCM and sent it back. The tech says the TCM is not the problem and the code is coming from somewhere else. I replaced the Transmission Control Relay in the Power Distribution Box. Received service engine light with codes. Feels like it may be in the wiring harness but wanted to see if there were other ideas.

Thanks!
 
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