No communication with the TCM. Car is in limp mode

Eduardo Technician Florida Posted   Latest   Edited  
Network Communications
2006 Chrysler 300 C 5.7L (H) 5-spd (NAG1)
P0605 — Internal Control Module Read Only Memory (ROM), Error
U0101 — Lost Communication with TCM
Car Will Not Accelerate Over 40 Mph

Good evening I'm having a issue finding the problem on this 2006 Chrysler 300. I check the power, ground, the high and low bus communication to the TCM and all checks out fine.

Mario Diagnostician
Mario Default

Load test those powers and grounds, all of them. If they are fine, replace tcm

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Matt Manager
Matt Default

I would disconnect the pcm and see if you have comm with tcm. The P0605 is a pcm failure code for the most part.

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Frank Owner/Technician
Frank Default

As Mario stated, make sure your power and ground can carry current. I've chimed in because I encountered the identical symptoms and codes no longer than 2 months ago...300srt with nag1. Used tcm followed by programming was the fix.

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Eduardo Technician
Eduardo Update

Just want to thank everybody for their help really appreciate. Cause of the problem ended up being a bad TCM

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