Pulled a code P1644

[Mr. iNCREDIBLE]

thanks Pete, going to see if JonW can help me resolve this cause my starscan has not arrived yet.. :(

[killercustomz]

I was at the dealer today and when we tried to initialize the TCM is when we got the P1644 code on the starscan. We tried resetting the ECU and the TCM with no luck. If we tried reflashing the TCM would we lose the upgraded programming that came in the Mopar TCM?

[fnkychkn]

If we tried reflashing the TCM would we lose the upgraded programming that came in the Mopar TCM?

if this is a mopar performance TCM, then i have no idea. i would think it would only update to a newer version of the same part number (just guessing).

[killercustomz]

It is a Mopar performance TCM. I'm going to get a replacement and see what happens. Thanks for the info.

[Mr. iNCREDIBLE]

keep us posted, as I would like to know..

[killercustomz]

keep us posted, as I would like to know..

I called the Mopar performance tech line number off the install sheet today and talked to a tech. He said the tcm was fried and if I sent it to them they would reflash it for free. He said they have seen 5 or so of these and most were because the dealer had used the starscan to initialize the tcm. Since the directions do not say not to initialize the performance tcm, like they would with the stock tcm, they will do the reflash at no charge. I will let you know when I get it back next week it that fixes the problem.

[TrunkBoii]

I am able to fix that issue if you ever need it resolved.

[backlash43]

I have a 2006 Charger R/T. I recently purchased a mopar tcm P5153332 / P5153854ab. I have a Predator with the 91 octane tune. I followed the instructions listed in another posting to install the tcm. the procedure was to take the car back to stock, swap out the tcm, drive the car several miles at different speeds to adapt the module. after adapting the module, reload the tune on the car. i did all of the above without any problem (the car drove great) until i got to the point of reloading the tune. As soon as i loaded the tune back on the car and started it up, and put it in gear, i had nothing. the car would not back up. it would not go forward. even the throttle would not respond. i then took the car back to stock again. with the car back to stock, the car would move in reverse and in forward. i then found that the transmission was in limp and would not shift past second. i scanned the car with the predator and it has only one code P1644. I had to put the original tcm back into the car to be able to drive the vehicle.
that all happened about a month ago. just to give you as much info as possible, i added a 3.73 Getrag last weekend. i will have to change the gear ratio in the tcm if i can save it. the reason i mention this is i have read another post that recommended loading the 91 tune on the car with the stock tcm and then change the tcm out. doing that would avoid tuning the tcm. with the gear change i just did, i will have to use the predator to change the gear ratio.
Any suggestions/assistance would be appreciated.

[backlash43]

i sent the tcm in as a core to Karma Racing. they reprogramed the unit and sent it back with their program in it. i sent a note with it indicating that i needed the gear ratio to be 3.73 when they programed it. i got it back and the gear ratio was set and it shifts great. installation was super simple. no tuner needed, no adaptation needed. plug and play. when i changed the gears to 3.73, the lag when the transmission shifted was extremely noticeable. the lag is gone and the shift points are at a much higher rpm. it is a HUGE improvement. i purchased this service through High Horse Performance.