P0857 OBD Error Code: Problem & Solutions

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Error code P0857? Here’s how you can simply diagnose and solve the error code P0857. When an error in the traction control input signal circuit is detected by the PCM, the code is stored. The PCM and other controllers receive data from the traction control input signal, that is further used to calculate engine RPM, fuel delivery strategy, and engine timing, amidst various other things. This code is valid only to the vehicles equipped with electronic traction control systems.

It should be noted that the electronic brake control module (EBCM) and the engine computer constantly communicate with each other. The EBCM informs the PCM to reduce the amount of power coming out of the engine when the engine is braking. The traction control system disables and the code P0857 is stored, if the two modules fail to communicate.

What causes this problem with the Traction Control Input Signal Range/Performance?

When the PCM or one of the other control modules fail to pick up an input signal from the traction control module the code P0857 is stored. A liquid contact damage with the module or one of the related components often triggers the code. It is observed that the P0857 results due to a malfunctioning traction control switch in most of the cases. The traction control module may also at times be damaged. A P0857 code at times can be triggered due to a damaged, broken, burnt or disconnected wirings.

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3. Electronic Brake Control Module - A lot of issues can arise due to an erroneous electronic brake control module. So, it is always recommended to change a distorted one.
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It is vital to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P0857 here:

Common Symptoms

Common symptoms leading to the error code P0857 include a failure in the traction system and complications with the transmission. A fall in fuel efficiency is also observed at times. The code P0857 at its worst may also disable the vehicle’s ability to shift gears. The code P0857 is stored in the vehicle’s onboard computer and the dashboard engine light may illuminate too.

Want to correct the Trouble Code P0857? Read these points mentioned below

• A defective traction control switch should be mended if required
• Wirings that are corroded, defective and disconnected should be repaired or restored if required
• If the control modules itself have been repaired, one must connect the module in question with a memory saver in order to avoid a costly reprogramming
• It is advised compare the voltage reading with the manufacturer's default specifications
• Lastly, the vehicle should be retested to check the following repairs to ensure that the trouble code has been solved successfully

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It is essential to diagnose this fault code. Here are some steps which a mechanic should follow for diagnosing the problem that triggered a P0857 code to be stored:

This code P0857 can be detected by connecting an OBD-II code reader into the vehicle’s computer. Firstly, the traction control switches should be inspected as these are the most common issues triggering the error code. A specialized scanner like the Auto hex should be used to simplify the process of diagnosing if the problem lies in the traction - related control modules. The wirings related to the traction control circuit should be investigated for any traces of corrosion and disconnections. One should carefully inspect the components related to the traction circuit too. 

Common Mistakes When Diagnosing the P0857 Code

Here are few common mistakes that should be avoided while diagnosing the error code P0857

• Issues with the wirings should not be overlooked
• A possible failure in the PCM
• A malfunctioning electronic brake control module (EBCM)