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Trails14
Samba Member
Joined: September 30, 2022
Posts: 2
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 Posted: Fri Sep 30, 2022 4:09 pm Post subject: 2001 Euro TCM 😫 |
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Check engine light keeps coming on in cool foggy CA coastal weather but goes off in warm dry inland weather. Replaced neutral safety switch. Dealer diagnosed faulty TCM code 65535, after transmission guy said faulty ECU. Dealer didn’t find faulty ECU.
I’m sure you all know all about this but I don’t know anything. Part no longer made by VW. Out of stock at LKQ. Are these refurbished parts really $2 grand? Will I need to replace ECU too? Can dealer program refurbished TCM? I read a thread here where they couldn’t reprogram because they no longer have those programs. The van runs fine but as I said above the check engine light does come on. What if I keep driving it? What’s going to happen? Will I ruin the transmission?
Any and all honest help is greatly appreciated.
Thank you. |
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EuroTec
Samba Member
Joined: August 24, 2020
Posts: 382
Location: Asheville, North Carolina
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| Posted: Sat Oct 01, 2022 9:49 am Post subject: Re: 2001 Euro TCM 😫 |
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| Trails14 wrote: |
Check engine light keeps coming on in cool foggy CA coastal weather but goes off in warm dry inland weather. Replaced neutral safety switch. Dealer diagnosed faulty TCM code 65535, after transmission guy said faulty ECU. Dealer didn’t find faulty ECU.
I’m sure you all know all about this but I don’t know anything. Part no longer made by VW. Out of stock at LKQ. Are these refurbished parts really $2 grand? Will I need to replace ECU too? Can dealer program refurbished TCM? I read a thread here where they couldn’t reprogram because they no longer have those programs. The van runs fine but as I said above the check engine light does come on. What if I keep driving it? What’s going to happen? Will I ruin the transmission?
Any and all honest help is greatly appreciated.
Thank you. |
First, year and model and engine size please. 
TCM can't be simply reprogrammed. You'll need a used one with the SAME part number IF yours is bad.
That code indicated a possible problem with moisture which correlates with the times you have the code present and CEL on. It's worth checking the TCU for moisture. It's located behind the carpet in the right most area of the drivers footwell, just below the fuse box. Pull back the carpet and have a look. If it's wet in there, that's the issue. TCM should be taken out and left in a bag of uncooked rice overnight to dry it out, then figure out why it got wet in the first place. The connector faces up so it may have gotten wet as well.
Of course, without further info, this is all just theory. 
_________________
If it ain't broke, don't fix it! |
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Trails14
Samba Member
Joined: September 30, 2022
Posts: 2
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| Posted: Wed Oct 05, 2022 2:22 pm Post subject: Re: 2001 Euro TCM 😫 |
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| Thank you! I’ll get out there to check that asap. I did put year and model in subject but didn’t put engine type. It’s Eurovan 2001 V6. I don’t think the mechanics have agreed with me that moisture had anything to do with this. |
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