limp mode after transmission swap?
#1
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hello all, as the title says, I have swapped my transmission with one with 67,000 miles. However, after swapping it, the car goes into limp mode, and a transmission fault Error appears. My mechanic says that it is a transmission programming issue, that he will have to fix, but that doesn't make any sense, because the original programmed transmission ecu was also installed with the transmission. Does anybody have any ideas?
#2
![Default](/forum/images/icons/icon1.gif)
VCATS,VCATS,VCATS,VCATS,VCATS,VCATS,VCATS,VCATS,VC ATS,VCATS,VCATS,VCATS!!!!!!!!!!!!!!!!!
There is NO NEED to replace a fully functional TCM on the AJ26/AJ27 ZF5HP24.(the correct software is already loaded in the TCM)
The TCM with the SAME VCATS /xxx suffix with work with ANY similar gearbox.
Put your original TCM in the CAN bus and see if that fixes your issue.
There might actually be an issue with the replacement gearbox to cause the gearbox fault?
What DTC(s) is/are logged in the TCM?
There is NO NEED to replace a fully functional TCM on the AJ26/AJ27 ZF5HP24.(the correct software is already loaded in the TCM)
The TCM with the SAME VCATS /xxx suffix with work with ANY similar gearbox.
Put your original TCM in the CAN bus and see if that fixes your issue.
There might actually be an issue with the replacement gearbox to cause the gearbox fault?
What DTC(s) is/are logged in the TCM?
Last edited by motorcarman; 12-02-2023 at 06:30 PM.
The following 3 users liked this post by motorcarman:
#3
![Default](/forum/images/icons/icon1.gif)
VCATS,VCATS,VCATS,VCATS,VCATS,VCATS,VCATS,VCATS,VC ATS,VCATS,VCATS,VCATS!!!!!!!!!!!!!!!!!
There is NO NEED to replace a fully functional TCM on the AJ26/AJ27 ZF5HP24.(the correct software is already loaded in the TCM)
The TCM with the SAME VCATS /xxx suffix with work with ANY similar gearbox.
Put your original TCM in the CAN bus and see if that fixes your issue.
There might actually be an issue with the replacement gearbox to cause the gearbox fault?
What DTC(s) is/are logged in the TCM?
There is NO NEED to replace a fully functional TCM on the AJ26/AJ27 ZF5HP24.(the correct software is already loaded in the TCM)
The TCM with the SAME VCATS /xxx suffix with work with ANY similar gearbox.
Put your original TCM in the CAN bus and see if that fixes your issue.
There might actually be an issue with the replacement gearbox to cause the gearbox fault?
What DTC(s) is/are logged in the TCM?
Last edited by ericnunez; 12-02-2023 at 08:30 PM.
#4
The following 2 users liked this post by motorcarman:
ericnunez (04-14-2024),
MountainMan (01-30-2024)
#5
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[QUOTE=ericnunez;2700095]Thats the thing, the original TCM of the replacement was loaded in as well. Man I really hope its not an actual gearbox issue. As for DTC's, I'm not sure, the mechanic said it said something about programming on there but I'm not sure that's even thing. Do you mean to put the original 100k TCM from the old gearbox on the replacement?[/QUOTE
Yes, motorcarman said put your original TCM back in. There was no need to change it.
Yes, motorcarman said put your original TCM back in. There was no need to change it.
#6
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[QUOTE=RJ237;2700233]
I was told by the "Jag Specialist" who sold me the replacement to swap in the new TCM with the replacement, as using the old TCM could result in issues. So that's what I did.
Thats the thing, the original TCM of the replacement was loaded in as well. Man I really hope its not an actual gearbox issue. As for DTC's, I'm not sure, the mechanic said it said something about programming on there but I'm not sure that's even thing. Do you mean to put the original 100k TCM from the old gearbox on the replacement?[/QUOTE
Yes, motorcarman said put your original TCM back in. There was no need to change it.
Yes, motorcarman said put your original TCM back in. There was no need to change it.
#7
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#8
The following 2 users liked this post by RJ237:
ericnunez (03-08-2024),
vincent661983 (12-14-2023)
#10
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Okay, so, according to my mechanic, he now tried using the trans with both TCMs, and both TCMs resulted with the same problem. Limp mode and transmission fault dash code. He says the issue is actually being caused by something electrical, and, according to him, it's because the engine and transmission are not communicating properly. He says he's trying to find where the issue is. My question is, is that possible? Or is it certainly a gearbox issue?
Last edited by ericnunez; 12-04-2023 at 05:42 PM.
#12
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Have them check:
1) The main electrical connector on the back of the transmission should be clean and dry. Check for any damaged or folded over pins.
2) The electrical connector on the top side of the transmission for the range switch should be plugged in and hopefully all pins are making proper contact and none of the wires are pinched between the engine and transmission.
3) The ground cable going from the transmission to the body on the passenger side in front of the catalytic convertor should have a good clean connection.
4) Have them record the codes from the ECM and TCM and please post them on here. I’m sure it’s already been done but, I’d advise to clear the codes with the key on, engine OFF, do not try to start it, disconnect the scanner, perform hard reset then try to retest everything again.
5) If all else fails, maybe a wiring issue inside the replacement transmission??
1) The main electrical connector on the back of the transmission should be clean and dry. Check for any damaged or folded over pins.
2) The electrical connector on the top side of the transmission for the range switch should be plugged in and hopefully all pins are making proper contact and none of the wires are pinched between the engine and transmission.
3) The ground cable going from the transmission to the body on the passenger side in front of the catalytic convertor should have a good clean connection.
4) Have them record the codes from the ECM and TCM and please post them on here. I’m sure it’s already been done but, I’d advise to clear the codes with the key on, engine OFF, do not try to start it, disconnect the scanner, perform hard reset then try to retest everything again.
5) If all else fails, maybe a wiring issue inside the replacement transmission??
Last edited by Addicted2boost; 12-04-2023 at 08:59 PM.
The following users liked this post:
ericnunez (12-04-2023)
#13
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Have them check:
1) The main electrical connector on the back of the transmission should be clean and dry. Check for any damaged or folded over pins.
2) The electrical connector on the top side of the transmission for the range switch should be plugged in and hopefully all pins are making proper contact and none of the wires are pinched between the engine and transmission.
3) The ground cable going from the transmission to the body on the passenger side in front of the catalytic convertor should have a good clean connection.
1) The main electrical connector on the back of the transmission should be clean and dry. Check for any damaged or folded over pins.
2) The electrical connector on the top side of the transmission for the range switch should be plugged in and hopefully all pins are making proper contact and none of the wires are pinched between the engine and transmission.
3) The ground cable going from the transmission to the body on the passenger side in front of the catalytic convertor should have a good clean connection.
#14
![Default](/forum/images/icons/icon1.gif)
Have them check:
1) The main electrical connector on the back of the transmission should be clean and dry. Check for any damaged or folded over pins.
2) The electrical connector on the top side of the transmission for the range switch should be plugged in and hopefully all pins are making proper contact and none of the wires are pinched between the engine and transmission.
3) The ground cable going from the transmission to the body on the passenger side in front of the catalytic convertor should have a good clean connection.
4) Have them record the codes from the ECM and TCM and please post them on here. I’m sure it’s already been done but, I’d advise to clear the codes with the key on, engine OFF, do not try to start it, disconnect the scanner, perform hard reset then try to retest everything again.
5) If all else fails, maybe a wiring issue inside the replacement transmission??
1) The main electrical connector on the back of the transmission should be clean and dry. Check for any damaged or folded over pins.
2) The electrical connector on the top side of the transmission for the range switch should be plugged in and hopefully all pins are making proper contact and none of the wires are pinched between the engine and transmission.
3) The ground cable going from the transmission to the body on the passenger side in front of the catalytic convertor should have a good clean connection.
4) Have them record the codes from the ECM and TCM and please post them on here. I’m sure it’s already been done but, I’d advise to clear the codes with the key on, engine OFF, do not try to start it, disconnect the scanner, perform hard reset then try to retest everything again.
5) If all else fails, maybe a wiring issue inside the replacement transmission??
#15
The following 2 users liked this post by Addicted2boost:
ericnunez (12-13-2023),
motorcarman (12-14-2023)
#18
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A replacement ECM needs an IMMOBILIZATION SETUP.
Once the setup is complete you cannot install the original ECM without ANOTHER 'immo-setup' to configure to original back to the CAN bus.(THERE CAN BE ONLY ONE)
You can install the replacement ECM and then try to start the engine only to find out you need an 'immo-setup' then realize you don't have the equipment so the original can be reinstalled and everything is back the way it was.
Once the setup is complete you cannot install the original ECM without ANOTHER 'immo-setup' to configure to original back to the CAN bus.(THERE CAN BE ONLY ONE)
You can install the replacement ECM and then try to start the engine only to find out you need an 'immo-setup' then realize you don't have the equipment so the original can be reinstalled and everything is back the way it was.
Last edited by motorcarman; 12-14-2023 at 10:23 AM.
The following 3 users liked this post by motorcarman:
#19
![Default](/forum/images/icons/icon1.gif)
A replacement ECM needs an IMMOBILIZATION SETUP.
Once the setup is complete you cannot install the original ECM without ANOTHER 'immo-setup' to configure to original back to the CAN bus.(THERE CAN BE ONLY ONE)
You can install the replacement ECM and then try to start the engine only to find out you need an 'immo-setup' then realize you don't have the equipment so the original can be reinstalled and everything is back the way it was.
Once the setup is complete you cannot install the original ECM without ANOTHER 'immo-setup' to configure to original back to the CAN bus.(THERE CAN BE ONLY ONE)
You can install the replacement ECM and then try to start the engine only to find out you need an 'immo-setup' then realize you don't have the equipment so the original can be reinstalled and everything is back the way it was.
#20
![Default](/forum/images/icons/icon1.gif)
Last edited by ericnunez; 12-15-2023 at 11:20 AM.