Transmission control module programming?
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From: SoCal
S211
Transmission control module programming?
Does anyone know if the TCU needs to be programmed to work? Or can I buy a used one from the salvage yard from the same car same model and it will work?
MBWorld Fanatic!
Joined: Dec 2003
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From: BC, Canada
2003 C230K Coupe Orion Blue
My understanding is that they're a direct swap if you buy the same version.
Guessing your TCU got soaked in transmission fluid. If this is the case, did you try simply hosing off the assembly with brake or electrical contact cleaner?
Guessing your TCU got soaked in transmission fluid. If this is the case, did you try simply hosing off the assembly with brake or electrical contact cleaner?
Thread Starter
Junior Member
Joined: Nov 2012
Posts: 26
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From: SoCal
S211
Also, what do you mean by the same version?
MBWorld Fanatic!
Joined: Dec 2003
Posts: 3,275
Likes: 236
From: BC, Canada
2003 C230K Coupe Orion Blue
Just curious, what are the symptoms for a malfunctioning TCU?
Thread Starter
Junior Member
Joined: Nov 2012
Posts: 26
Likes: 0
From: SoCal
S211
For the safest result buy one that has the same HW and SW versions. A newer/different version may or may not work, though I imagine that as long as you get the same MB PN you’ll be fine. The firmware inside the TCU can be flashed by a dealer as well. I’m guessing the different HW versions may account for different features such as manual/automatic or AMG shift logic.
Just curious, what are the symptoms for a malfunctioning TCU?
Just curious, what are the symptoms for a malfunctioning TCU?
MBWorld Fanatic!
Joined: Dec 2003
Posts: 3,275
Likes: 236
From: BC, Canada
2003 C230K Coupe Orion Blue
As in the car would start in 3?
I once had a weird problem with the car dropping out of gear randomly during normal driving. It would go back into gear (2nd) if I dropped the speed below 40km/h. Updating the leaky pilot bushing fixed the problem. Opened up the passenger footwell to check a few years later and found the compartment soaked with old fluid which I mostly soaked up. The TCU casing and electronics were dry, but maybe it had all evaporated. I got lucky because there was a dip in the cable routing before the TCU so it looked like the fluid pooled and dripped off before reaching the TCU.
I once had a weird problem with the car dropping out of gear randomly during normal driving. It would go back into gear (2nd) if I dropped the speed below 40km/h. Updating the leaky pilot bushing fixed the problem. Opened up the passenger footwell to check a few years later and found the compartment soaked with old fluid which I mostly soaked up. The TCU casing and electronics were dry, but maybe it had all evaporated. I got lucky because there was a dip in the cable routing before the TCU so it looked like the fluid pooled and dripped off before reaching the TCU.
Last edited by slammer111; Jan 21, 2022 at 11:32 AM.
Thread Starter
Junior Member
Joined: Nov 2012
Posts: 26
Likes: 0
From: SoCal
S211
As in the car would start in 3?
I once had a weird problem with the car dropping out of gear randomly during normal driving. It would go back into gear (2nd) if I dropped the speed below 40km/h. Updating the leaky pilot bushing fixed the problem. Opened up the passenger footwell to check a few years later and found the compartment soaked with old fluid which I mostly soaked up. The TCU casing and electronics were dry, but maybe it had all evaporated. I got lucky because there was a dip in the cable routing before the TCU so it looked like the fluid pooled and dripped off before reaching the TCU.
I once had a weird problem with the car dropping out of gear randomly during normal driving. It would go back into gear (2nd) if I dropped the speed below 40km/h. Updating the leaky pilot bushing fixed the problem. Opened up the passenger footwell to check a few years later and found the compartment soaked with old fluid which I mostly soaked up. The TCU casing and electronics were dry, but maybe it had all evaporated. I got lucky because there was a dip in the cable routing before the TCU so it looked like the fluid pooled and dripped off before reaching the TCU.
I have already changed the pilot bushing along with the conductor plate. Also I have a code of p2600 and p2601
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