Ashley P Posted October 25, 2023 Share Posted October 25, 2023 2012 wrangler w/5 speed "NAG1" or "W5A580" Mercedes automatic trans. Limp mode, p0753 "1-2 / 4-5 Solenoid circuit" fault. Followed diag flow chart which is checking the wires and solenoid for resistance/shorts, all wires were good. Replace TCM. Not fixed. Retested. Same results. Switched "contact plate" (circuit board at valve body) as an educated guess. Truck shifted perfectly from 3 stops, then back to p0753. Replaced the contact plate AGAIN. Did not fix it at all. My hunch is that the code is generated from a shifting concern yet the code only covers the electrical side. I'm up a creek.... Quote Link to comment Share on other sites More sharing options...
Ashley P Posted October 25, 2023 Author Share Posted October 25, 2023 Also called a "722.6". Quote Link to comment Share on other sites More sharing options...
Ashley P Posted February 14 Author Share Posted February 14 New hunch, the test for p0753 is GARBAGE. It only tests the circuit for the 1-2/4-5 solenoid, and only gives possible failures of that circuit or the computer. News flash to the fine folks who wrote that garbage, improper power supply can cause that code. Thanks DiamlerChrylser. (And the wiring diagrams have several wrong colors and some wrong terminal numbers. That's REALLY handy.) Quote Link to comment Share on other sites More sharing options...
Ashley P Posted March 1 Author Share Posted March 1 ^ That last post was from an ignorant person. Said person has bypassed that suspect wire and the code and all driveability symptoms are gone. The test was inadequate to find whatever problem that wire had. Quote Link to comment Share on other sites More sharing options...
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