edit: title should be "transfer case module swap", oops... not sure why we can not edit titles, on other forums I can.

Neighbors truck, we knew it had issues due to major corrosion of the computer area. This was found after he already purchased it, no clue what cause it but it seems to be more extreme than typically vent tube not being hooked up. I mean the connectors are literally disintegrated. Last fall I neutralized it with water and baking soda, took a lot. Figured there would be issues going forward and it finally did. Last week he was getting faults with flashing low range indicator on the cluster. I think the GAP fault was something about gear shift range selection. Anyway, noticed when running if we touched the connectors to the transfer case module the faults would come and go, easily repeatable. So today I swapped the two smaller connectors. Annoyingly the faults continued, so we swapped the module itself and so far all is well. But I am getting a code, U1A35-4A - VIN data - System Internal Failure - Incorrect Component Installed. But it does changes ranges just fine and the truck it not complaining about anything. We did do all the transfer case calibrations too, which went fine. Thinking just to ignore the fault?

 

Did you use the GAP tool to do the transfer case calibrations?

I've recently replaced my transferase and have not done the calibrations per the workshop manual but everything seems to be fine while driving and no error codes. After parking I'm hearing something that sounds like it is going form the front drive shaft to the front diff but I have not been able to investigate it further due to the weather. I also did some suspension component replacement at the same time so it could be something else.

 

I did not replace the transfer case computer, just the actual transfer case

 

Yeah, GAP tool for sensor position and calibration.

 

Do you have to go into the calibration sequence more than once? Was just reading the thread at https://landroverforums.com/forum/lr...se-ecu-102144/ ...

 

No clue. We did the calibration once just to do it. But did not throw faults prior and it not throwing any now, changes range just fine.

 

Well it must be OK then, strange that you are seeing that U1A35-4A code, I guess it is something in software, but if it is behaving itself and not affecting vehicle performance it must be an "undocumented enhancement"...

 

Drive it. I've tested many of these modules for functionality in my LR3 and found they all (but one) came up with the same "incorrect component" code. Some may think this message means the wrong module (part number, type or spec code) but I believe it is simply the BCM (or whatever scans the modules) warning that the original module it was looking for is no longer installed. My original module was replaced with a used one a few years ago... never had any issues... in fact, it doesn't throw the "incorrect component" code anymore. It must have learned the replacement module is the new norm and given up creating the fault code.