SB500

my car is jerking when I put it in reverse or drive then it gets stuck wont shift to park i have to turn the car on im gettin p0705, p0134, p0135, p2143 anything to look at or try before taking it to a mechanic?

Rudeney

These are all generic OBDII codes from the ECU. You really need to get the TCU codes pulled, which requires a specialized scanner, such as the dealer's SDS. Here are the codes you have:

P2067 Fault is stored in component N15/3 (ETC [EGS] control unit). (P0705)

^^^ That one tells you the TCU needs to be scanned

P20BE - [1] G3/4 (Right O2 sensor, before TWC [KAT]) : Short circuit to positive /
Resistance of sensor heater too low (P0135)
P20BE - [2] G3/4 (Right O2 sensor, before TWC [KAT]) : Short circuit to ground (P0135)
P20BE - [4] G3/4 (Right O2 sensor, before TWC [KAT]) : Open circuit in sensor heater line
(P0135)
P2008 - [8] Heating of component G3/4 (Right O2 sensor, before TWC [KAT]) : Heating
capacity is too low. (P0135)
P200F - [4] G3/4 (Right O2 sensor, before TWC [KAT]) : Open circuit (P0134)

^^^ All of those indicate a problem with the "upper" O2 sensor on the right (USA passenger) side. This has nothing to do with the transmission issues or limp mode.


OBDII codes P2143 doesn't translate directly to an MBZ-specific DTC.

SB500

thank you for always replying man u been a good help!!! What do u think i should do? Change the o2sensor and get the tcu scanned? ..... Should i check to see if i have that famous 722.6 leak that goes to the tcu or u dnt think thats the problem?

xsever

I am not one to throw parts at cars, but given the symptoms you are describing with the jerking and all that and given how common this problem is with 2003-2004 models , it's probably the conductor plate gone bad and needing replacement. I've had the same thing happen to me with my old 2003 CLK 320. While you do that, yes it would be good to replace the pilot bushing connector which leaks and to check the TCU as well and make sure no fluid got into there.

However, you are definitely recommended to have the car scanned with STAR diagnostic to know exactly what is going on.

Rudeney

On the O2 sensor codes, I'd first check the wiring harness - it's possible that it has come dislodged from a clip and has contacts the exhaust and melted. If not, then it;s probably a bad sensor that needs to be replaced.

As for the limp mode on the transmission, you need pull codes from the TCU with proper diagnostic equipment (like the dealer's SDS). In the mean time, you can check the TCU for oil intrusion. It's located under the passenger side dash. Pull the carpet down fron under the dash to expose the sloped part of the footwell. Remove the foam insulation panel, then remove the metal panel and the TCU is attached to the back of it.

SB500

thanks for all the help again, I pulled the tcu and it was covered in liquid as well *** the connectors and under the carpet it didnt come through the carpet tho but it looks like its been sitting there for quiet some time, should i change the conductor plate, gasket, filter and adapter and clean the tcu and connectors to tcu with contact cleaner (i believe its called). Or can i just replace the adapter & clean the tcu? do u think i'll have to replace the tcu?

Rudeney

I'd work on the TCU first. Since oil has wicked into it, the first step is to fix the pilot bushing on the transmission's electrical connector. I have hear that some success has been had in cleaning the wiring harness and TCU of all oil. MAF sensor cleaner or other fast-flash de-greaser might work. If not, you may have a new TCU in your future. I would not look to the conductor plate until that is resolved.

gixxerboy

Rudeney is correct. those case connectors leak allot and are a easy and cheap part to replace. I've had a few come in our shop and the fluid wicked its way up to the tcu and it was still ok after.

SB500

Ok im going to get to that this week i seen the adapter "Dorman part # 917-505" with good reviews on amazon, advance auto zone by my house carries it so im going to pick that & some electrical cleaner up

SB500

i cant get the tcu open, can i just spray the contact cleaner inside and let it drip down and air dry?

gixxerboy

I would put in a container with something absorbant to try to wick any fluid out of it, kinda like a cell phone in rice when it gets wet

SB500

I ended up getting it open and also purchased the adapter, going to get some crc electrical spray and get started

SB500

i got the adapter changed a few days ago, but in order to see if its fixed is by resetting my tcu with star diagnostic?

gixxerboy

any scanner should clear the codes to see if its fixed. You dont need star

SB500

from my understand only STAR can clear tcu/tcm codes though, so any obd can clear it?

SB500

can any1 shed light on the tcu being reset

gixxerboy

i do it all the time at work. I run a trans shop, i can do it with a snap on scanner

SB500

can u shed light on the star clearing the tcu or can anything clear the tcu codes?

gixxerboy

you do not need star to clear codes. I do it all the time at work, we work on Mercedes often its not an issue. I just use our snap-on scanner, im sure most scanners would work.

DanielFD

snap-on scanners are great, some of the best worldwide, thats why you have no problem clearing TCU codes, in fact almost all off the shelf cheap scanners wont read TCU codes.

gixxerboy

yea the cheap one wont, but any independent shop with a decent scanner can clear them.

DanielFD

OP should find a trustworthy independent shop for things like these. Always useful to have somebody with a decent scanner and some knowledge about our cars.

SB500

thank you both for the replies




also, one more question.. is this level too high?

DanielFD

perfectly normal!

SB500

thanks for all the help dan! Much appreciated... I changed 2 faulty fuel injectors & the transmission adapter... when i changed the transmission adapter alot of atf came out.. i added 1 quart of febi... can not having enough atf cause limp mode? i ordered a dip tool offebay should be here tomorrow, was only $7