The transmission ECU lives (together with the engine ECU) in a nice protective & controlled environment in the E-box (the big black plastic box on the RH inner wing).

For that reason, they rarely give problems.

The transmission ECU is plug & play so it can just be swapped over (though clearly different ECUs will have learnt different long-term adaptions). The US and ROW ECUs have different settings so make sure that you get one from an American vehicle.

Phil

 

Phil if you see this, I could use some guidance. I had a 3-4 shift issue so using your awesome information on this site, I was able to drop the valve body/mechatronic unit out and put in a couple new solenoids. Problem is, the truck is together now, but it won't start. Everything works as normal, just won't crank and key will only turn once then it won't go past the "on" position. There is no gear shown on the dash (usually it shows "P" for park and so on) but when I shift through the gears nothing comes up. I also have a fault showing a communication failure from the TCM something to do with an algorithm. I checked the connector sleeve and plug, there was some tranny fluid in there so I cleaned it as best I could and ensured a tight connection, but no luck. My IIDTool isn't even showing a transmission ECU at this point so it seems it isn't connecting. Any ideas on what to do?

 

Just wondering if u ever figured out there problem. I swapped out my shift solenoids and now can't start mine.

 

Oh and it's a 2006 RRSC

 

Hi Phil
I could only find my Denso ECU and Bosch Integrated transfer case, I am still trying to locate my Transmission controller. Can you show some pictures?

 

Which model & year is your Range Rover?

Phil

 

Hi Phil, i have an 08 L322 HSE and the Bosch integrated transfer case comp got wet (hole in the plastic cover) and now my RR says transmission failure, HDC failure and Parking brake autorelease unavailable and the low range light is flashing. is that the Trans control module? ive been looking for what forum to post on and this was as close as i could find.

any help would be awesome.

-Coop

 

Hi Phil, i have an 08 L322 HSE and the Bosch integrated transfer case comp got wet (hole in the plastic cover) and now my RR says transmission failure, HDC failure and Parking brake autorelease unavailable and the low range light is flashing. is that the Trans control module? ive been looking for what forum to post on and this was as close as i could find.

any help would be awesome.

-Coop

hi , did you manage to get this problem fixed , i am afraid i have done same thing on my rrs😓

 

Probably didn't get the shift lever inside the transmission aligned properly. Theres a slide on the mechatronics unit that fits on to pins on the mechanical shift arm, if that slide isn't properly lines up you get no start, and no dash indications.

Theres a picture in this thread; https://www.rangerovers.net/threads/replaced-solenoid-in-mechatronic-unit.227554/#post-1630602

 

Probably didn't get the shift lever inside the transmission aligned properly. Theres a slide on the mechatronics unit that fits on to pins on the mechanical shift arm, if that slide isn't properly lines up you get no start, and no dash indications.

Theres a picture in this thread; Replaced solenoid in mechatronic unit

Hi Mark I need help as well is the tcm and the transfer case module the same for a 06 RR sport if not how can I get the part # for the TCM please...

 

Mark,

It goes without say that you were absolutely right. As much as I hated having to drain all that fresh fluid and lift the trans up again to drop the pan, you really hit the nail on the head. Thanks for still lurking or at least checking your email after all these years.