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2003 C240 4matic wagon transmission drops into neutral

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Old 12-04-2012, 11:19 AM
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2003 C240 4matic wagon
2003 C240 4matic wagon transmission drops into neutral

Hi all,

I contacted a third party online with my issue as follows:

My 2003 C240 wagon transmission started slipping last night, then when placed in drive, acted like it was still in neutral. When I shut the car off for 5 minutes, it would go back into gear, but when slowing or stopping on an upward incline, back to neutral. Check engine light is on. 5 minutes off, allows it to go back into gear
There are four error codes displaying now.



1-P2502

2-P220A

3-P2500

4-P2221
The guy that I contacted has a strong opinion that the wiring harness has been contaminated, and the seal is bad, but my mechanic did not observe that issue.

"As I mentioned on the 5th, I'm still strongly suspecting a common problem with the main electrical connector."

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Any other opinions out there? Thanks for any help...

Jon
Old 12-04-2012, 06:03 PM
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2005 c230 kompressor 2003 s500 94 wrangler
buy a transmission dipstick to check the level or your the mechanic check

when was the last transmission drain and refill? n replaced AT plug adapter?

if past 40k miles then your transmission was most likely leaking from plug adapter and destroyed the trans computer
Old 12-04-2012, 08:54 PM
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2003 c240 4matic wagon
check your RAD you may have the valeo rad which can leak into the tranny cooler causeing coolant in your tranny VERY bad

do a search here on the rad troubles i had it happen to my car 2 years ago I stopped driving it replaced rad and did a tranny FLUSH and i got lucky all was well!

good luck!
Old 12-05-2012, 04:33 PM
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2003 C240 4matic wagon
Sammydragon: My mechanic did flush the system and replace the filter. Is there a way to check the transmission module?

Contact148: I will have him check the radiator brand; I had heard of this issue from a co-worker. He did say that the tranny fluid looked fine. Which would be easier to detect?...tranny fluid in the coolant or vice versa?
Old 12-05-2012, 10:57 PM
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2003 c240 4matic wagon
when mine got coolant into it you could NOT see it with your eyes i sent a sample to blackstone labs and they confirmed coolant in my tranny fluid

dont drive the car till you figure it out you may cause more dammage

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