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Use an advanced OBD-II code reader to read and erase Engine CEL, Transmission, ETS, ABS, Airbag and other systems.

P0720 P0715 Mercedes Transmission Issues

Is your Mercedes-Benz stuck in second gear (limp mode), and the check engine light came on? You are experiencing transmission problems. You press the gas pedal, and the engine RPMs go up to 4000 or even higher, and you are limited to a max speed of about 30 MPH. The check engine light (CEL) comes on. Scan the car using an OBD-II code reader and get fault codes such as P0715, P0720, and P0700. Di gnostic Trouble Code (DTC) P0715 is detected when TCM or ECM does not receive the signal from the input/turbine speed sensor.

Quick Tip If you need to get home, try turning off the car. Remove key and wait a couple of minutes then restart the car. You may be lucky and get the car out of limp mode. It is a matter of time before your Mercedes-Benz goes back into limp mode. Get your transmission problem resolved. Read on to learn how to troubleshoot and fix the most common Mercedes Benz automatic transmission problems.

Mercedes Automatic Transmission Fault Codes

Here is a list of Mercedes 5-speed and 7-speed automatic transmission-related error codes.

  • P0720 – Output Speed Sensor Circuit Malfunction
  • P0715 – Input/Turbine Speed Sensor Circuit Malfunction (Transmission Conductor Plate or 13-pin connector issue)
  • P0700 – Transmission Control System Malfunction (Generic Code telling you there is a gearbox problem)
  • P 0716 P0717 P0718 – Input / Turbine Speed Sensor Circuit Malfunction / Range Performance / No Signal / Intermittent
  • P0719 – Torque Converter Brake Switch Circuit Low

All these fault codes point to powertrain malfunction, typically automatic transmission problems.


  • Mercedes-Benz does not shift properly
  • Check Engine Light / Service Engine Light On
  • Stuck in second gear / Limp Mode
  • High Engine RPM
  • Limited Max Speed of 30 MPH

Possible Causes

In most cases, the problem is one of the following:

Mercedes Benz Valve Body 722.6 5 Speed Transmission
Defective Conductor Plate
Failed 13-pin connector harness, Leaks Oil, Transmission O-Ring

Cost to fix P0715 P0720 P0700.

The good news is that to repair any of the problems mentioned above, you don’t need to remove the Transmission from the car. You can perform the repairs with the Transmission in place. The most expensive repair could cost a few hundred dollars.

mercedes benz transmission plug connector bolt 5 speedThe first thing that you should check is the 13-pin connector plug. This is the electrical wire harness plugs into the valve body inside the Transmission. It leaks oil and causes communication problems between the transmission control unit and the sensors on the valve body. This part costs less than $20 and can be found on Amazon. Follow this article o  How to replace the 13-pin connector on the Mercedes-Benz transmission. 

If the valve body conductor plate is the problem, you are looking to spend $150-$250 for the conductor plate. Depending on your location, auto repair shops may charge between $650 and $950. The Mercedes-Benz dealer hip quoted between $1400 and $1800 for this repair. One place where you will find reasonably priced conductor plates for Mercedes-Benz 5-Speed 722.6 and 7-speed 722.9 transmissions is Amazon.

How to replace the valve body

If the 13-pin connector doesn’t fix the problem, the next step is replacing the valve body conductor plate. Replacing the conductor plate is easy. It is mounted on top of the valve body. You will need to remove the valve body from the Transmission. The Transmission doesn’t need to be r placed. The valve body can be removed from un underneath. Replace the conductor plate and reins all the valve bodies.

YouTube video

DIY Troubleshooting

The codes listed above give you a general idea of what’s wrong with the car. They are fault codes stored on the Engine Contol Unit (ECU); you get them from a generic OBD II scanner. To properly troubleshoot the transmission problem on your Mercedes-Benz, you will need a diagnostic scanner to retrieve the fault codes from the transmission control unit (TCU). The next step is to get a hold of such an advanced diagnostic scanner and read the TCU error codes, which will help you narrow down the problem with your Mercedes-Benz. If you don’t have one, there are a couple f affordable scanners that will allow you to read transmission fault codes (also abs, etc., esp and most of the systems on your Mercedes-Benz), and you can find these scanners on Amazon, see links below.

If you want to read more about diagnostic scanners that work on Mercedes-Benz, you may find this article helpful: Top 10 Best Diagnostic Scanners for Mercedes-Benz.

Once you fix the problem, such as replacing the 13-pin connector or the valve body, you will need a diagnostic scanner, such as the YOUCANIC full system scanner, to erase the fault codes and get the car out of limp mode.

How to read and erase transmission fault codes.

Use an advanced scanner to read the fault codes from the transmission control module. Fix the problem that is specific to your car, then use the OBD-II scanner to erase the fault codes to get the car out of limp mode. Watch the video using the above scanner to read and erase the fault codes.

Possible Solutions

Depending on your troubleshooting outcome, here are some articles that will help you repair the problems on your Mercedes-Benz.

13 Pin Connector – DIY Replace Transmission Connector Adapter Plug O-rings Mercedes Benz 722.6
Mercedes-Benz Valve Body 722.6 NAG1 Installation
Check the Transmission Fluid Level

Still having Automatic Transmission Problems

If your Mercedes-Benz transmission is still acting up, other reasons could cause it to shift erratically, be stuck in second gear, limp mode, stuck in park, or other problems. Read Mercedes-Benz Automatic Transmission Problems and Solutions article if you need more help.

What is the Best Scanner to use for my Mercedes-Benz?

If you’re experiencing problems with your Mercedes-Benz, the YOUCANIC full system diagnostic scanner can be an invaluable tool for troubleshooting and diagnosing the issue. This scanner is designed specifically for use with Mercedes-Benz vehicles, allowing you to access and analyze data from your car’s various systems and modules.

With the YOUCANIC scanner, you can perform various diagnostic functions, including reading and clearing fault codes, monitoring live data, performing component activation tests, and more. This allows you to identify the root cause of the problem and take appropriate action to fix it, whether it involves replacing a faulty component, adjusting to a system setting, or performing more extensive repairs.

By using the YOUCANIC full system diagnostic scanner, you can save time and money by avoiding unnecessary trips to the mechanic and performing repairs yourself. Plus, with the ability to access real-time data and diagnostics, you can stay on top of your vehicle’s maintenance and prevent potential problems before they occur.


Applicable Models

This problem is common in many Mercedes-Benz models, including Chrysler Crossfire, Dodge Sprinter Vans, and SLR McLaren.

Mercedes-Benz Transmission Valve Body Electrical Conductor Plate  (5-Speed 722.6xx Transmission) 1402701161 => 1994-1997 5-Speed A/T SL320 / 1994-2006 5-Speed A/T SL500 / 2003-2007 5-Speed  SL55 AMG / 1994-2007  SL600 / 2005-2007  SL65 AMG / 1998-2004  SLK230 / 2002-2004  SLK32 AMG / 2001-2004 SLK320 / 2010  Mercedes-Benz Sprinter 2500 3500 / 2003-2009  Dodge Sprinter 2500 3500 / 2002-2010 Freightliner Sprinter 2500 3500

MERCEDES-BENZ TRANSMISSION IMPACTED MODELS 1997-2007 C230,C240,C32,C320,C55,CL500,CL55,CLK320,CLK500,CLK55,E300.E320,E420,E430,E500,E55,ML320,ML350,ML430,ML500,ML55,S430,SL320,SL500,SL55,SL600,SLK320,SLK32,SLK320,AMG,SPRINTER


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