mannysalsero

Can anyone help me with this i pulled code and it came up with p2100. It started last week got in car in am and notice that the car was stucked in 1st gear i drove it then pulled over and turned car off. Then i restarted car and it went away. Was fine for 3-4 days then it happened again and the check engine light came on also.My mechanic came and brought his scanner tool and we pulled the error code p2100. Please help.

pcy

quick search of P2100 shows the following - "1-2 And 4-5 Shift Solenoid Valve Malfunction".

Please search this forum with 'pilot bushing' or 'trans connector'.
Check the trans connector and the pilot bushing. When you open the pilot bushing, see if the oil is on the pins/connector. If you see oil on the pins/connector, change the pilot bushing.

If cleaning/replacing the pilot bushing doesn't solve the issue, you may have to change the 'conductor plate' that holds the solenoids.

mannysalsero

Is This what you are taking about.

Glyn M Ruck

Yes

mannysalsero

Thanks any part numbers available.

Glyn M Ruck

BTW P2100 can also = Throttle Actuator Control Motor Circuit/Open

Bush is P/N A 203 540 02 53 - have one lying on my computer stand.

mleskovar

If you're getting the error code because that 'plug' is leaking then you need to look at the TCU (under a plate in the front passenger foot well ) for trans fluid migration/contamination up the wire loom. Use circuit board cleaner and compressed air to clean/dry things off and hopefully you'll save the TCU.

Glyn M Ruck

I posted it all here recently.

https://mbworld.org/forums/c-class-w...sues-help.html

mannysalsero

Thanks everybody tommorow i will go buy 2 or 3 bushings and try the fix myself.I wil post update after. Then i will keep a couple for spare's just in case. Again thanks to all for the help.This is why forums are so helpful.

Glyn M Ruck

Go well - it's a pretty easy DIY. I find as long as I carry spares I have no trouble. LOL

At $8 each it's good insurance.

mannysalsero

Got part today hope to install tommorow.

mannysalsero

Well cant get car fixed till Friday by my mechanic. And i am doing a transmission drain.Hopefuly we will be all set.

mannysalsero

Took car to mechanic today changed transmission oil swap bushing and all filters. Changed engine oil also. Drove car everthing was fine. Codes all gone then later drove car and error come back. same systems but when we were checking code one code we could not change p2ooo cdfe now what.This is really getting to me. Any suggestions?

mannysalsero

ok found code what does this mean.
P2000 NOx Trap Efficiency Below Threshold (Bank 1)

Glyn M Ruck

P2000 NOx Trap Efficiency Below Threshold (Bank 1)
P2001 NOx Trap Efficiency Below Threshold (Bank 2)

You have a Cat converter on the way out

OR

You have an upstream O2 sensor that is cycling too slowly & effecting fuel trim to the rich end of the scale.

How many miles on the car?

What is the general state of tune?

mannysalsero

car has 74,000 miles 02 c240 tuned by tvt design last year runs fine til now.but what about my original problem its back also?

mleskovar

P2100 again? Was the plug leaking before it was replaced? Did you check the TCU under the passenger floor rug for oil contamination? What did tvt do to "tune" the car?

Glyn M Ruck

+1 sounds like oil somewhere still.

mannysalsero

i checked tcu on passenger side floor panel it looked dry to me ,but i didn't open the tcu should i? and how do i open it? and yea the bushing was leaking . The mechanic did not dry the inside where the bushing was. Could that be the problem?But what about the p2000 error code now?

mannysalsero

Glyn,
i spoke to my mechanic and he did verify that he did not dry inside where the bushing was leaking. He didnt want to spray brake cleaner in there to dry it. Is it ok to do that.And do you think that s the problem that it is still wet.You have been so helpful that is why i like this forum.

Glyn M Ruck

You have to dry off any oil that might get on the connector pins or into the harness. The oil causes a partial short across the pins a sends wierd values to the TCU.

Regarding the other code - 2000 - clear it & see if it comes back. I don't know why you are not getting an O2 sensor code if it's going out. You might have a Cat failing & I think you are protected by US law up to 80,000 miles so you might get Benz to pay the bill.

When your car was tuned - did they mess with the ECU mixture mapping?

mannysalsero

Sorry for the delay but car is all set thanks for all the help.

mleskovar

What solved the problem?

pcy

what fixed the problem?

mannysalsero

The plug was still wet.We took out bushing again and dried it with brake cleaner.