R170 Gearbox issues

[Sbryantgb]

2000 R170 SLK 200 Kompressor

Gearbox will not shift beyond 1st (Limp mode). This happened directly after having run the car through an automatic car wash. (Which also performed an underbody wash)

B-3020-Body
P0220- Powertrain

The above codes are from the OBD connector using Torque Pro.I have looked up both and also read as many posts and threads that I can find, but I'm wondering if the issue might be moisture in the Mercedes Transmission 13-Pin Connector?

 

[Sbryantgb]

I have been trying to diagnose this issue for the past few days. Unfortunately I do not live nor is the car parked in the most ideal situation since the street is both very narrow and always busy. I have checked off some items though.
1/ Fluid levels are correct
2/ Battery voltage seems good, 13v ignition off. 14.5v at engine idle.
2/ No corrosion or or oil seepage in the TCM.
3/ No apparent contamination on shift lever control board. (although more on this in a moment).

I am unable to get under the car to check the 13 pin connector or the shift solenoid etc at this time, and checking the throttle pedal sensor is virtually impossible due to its location and the traffic flow on the street.

Going back to the shift lever. With the key in the 3rd position (all lights on etc) if I cycle the shifter through P N D the lcd display shows the correct position. However if I select any other gear 4 3 2 1 the D legend remains. I seem to remember that the downshifts would show previous to this issue.

 

[wongl]

2000 R170 SLK 200 Kompressor

Gearbox will not shift beyond 1st (Limp mode). This happened directly after having run the car through an automatic car wash. (Which also performed an underbody wash)

B-3020-Body
P0220- Powertrain

The above codes are from the OBD connector using Torque Pro.I have looked up both and also read as many posts and threads that I can find, but I'm wondering if the issue might be moisture in the Mercedes Transmission 13-Pin Connector?

I am not familiar with the error codes listed, but a quick search on Google would suggest that B-3020 could be caused by a faulty MAF (among other possible fault). See

b3020 Engine Trouble Code

Learn what b3020 means for your car: causes, symptoms, and solutions.

b3020.enginetroublecode.com

The P0220 error code could be caused by a faulty throttle position sensor or a faulty accelerator pedal position sensor. See

P0220 OBD-II Trouble Code: Throttle/Pedal Position Sensor/Switch Circuit "B" Malfunction

P0220 trouble code definition Throttle/pedal position sensor/switch circuit B malfunction. What the P0220 code means The P0220 code means that the vehicle’s powertrain control module has detected a voltage or resistance reading...

www.yourmechanic.com

.

 

[Sbryantgb]

Based on the two fault codes I ordered a replacement MAF and Throttle pedal switch. They finally arrived and installed today.
This has sorted the original two fault codes.
However I now have a P0715 code, and the car is still in limp mode
This is directly pointing at the 13 pin connector or conductor plate, I was hoping to avoid this.
Will try a transmission reset (nothing to lose)

 

[Jigglyjohnson]

Based on the two fault codes I ordered a replacement MAF and Throttle pedal switch. They finally arrived and installed today.
This has sorted the original two fault codes.
However I now have a P0715 code, and the car is still in limp mode
This is directly pointing at the 13 pin connector or conductor plate, I was hoping to avoid this.
Will try a transmission reset (nothing to lose)

Hi
Wha is the p0715 code saying ??

 

[Sbryantgb]

Pending Fault Input/Turbine Speed Sensor Circuit

P0720 P0715 Mercedes Transmission Issues – MB Medic

www.mercedesmedic.com

 

[amazighman]

Might well be the conductor plate as per the symptoms you described .
Good thing is that they are not mega job to replace for a Diy mechanic

 

[Sbryantgb]

Might well be the conductor plate as per the symptoms you described .
Good thing is that they are not mega job to replace for a Diy mechanic

I agree, unfortunately I have neither the tools or facilities to attempt at this time.

 

[amazighman]

Tbh all it needs is basic tools and loads of videos are available online
If you check with your local transmission specialist they will be able to advice.

 

[Sbryantgb]

Tbh all it needs is basic tools and loads of videos are available online
If you check with your local transmission specialist they will be able to advice.

Sorry my fault, should have been clearer. I'm more than capable of doing the job. What I need is to find somewhere off road to do the work. I have a spare 13pin connector so I will probably find someone local to at least swap that out. I would at least then know it's the conductor plate.

 

[Jigglyjohnson]

I would suggest it is indeed the electrical plate we saw these quite common back in the day. Not a hard job to do and I would also do the 13 pin connector it has to come off anyway