Error Code P0856: What It Means & What To Do?

<<See All OBD Codes

Error code P0856? Don’t know what to do? Well, this Parts Avatar guide is all you need to crack the OBD error code P0856. This code is a regular code that identifies an error with the traction control input signal. The powertrain control module (PCM) and a set of other modules receives data from the traction control input signal. This data is further used by the PCM and the other set of modules to determine the proper revolutions per minute (RPM) for the vehicle along with the engine timing, fuel delivery and various other functions. When the traction control modules fail to send input signals to the PCM as well as the other control modules, the trouble code P0856 is stored.

It is observed that the electronic brake control module (EBCM) and the engine computer (PCM) constantly communicate and connect. The EBCM informs the PCM about reducing the amount of power coming out of the engine while the engine is braking. The code P0856 sets in causing a traction control system to disable if the two modules fail to communicate with each other.

What causes this problem with the Traction Control Input Signal?

An erroneous ON/OFF switch in the traction control system triggers the code P0856. Spills or leakage damaging the control switch, or defective, loose, or damaged wires, connectors, and other electrical components in the system are some major causes that lead to an error code P0856. Besides a distorted switch, a deteriorating traction control sensor connector also leads to the P0856 code to be detected. In rare cases, the traction control module may also malfunction and lead to further complications.

1. Powertrain Control Module - abbreviated PCM; this is an integral control unit. So, a defective one should be changed immediately.
2. Electrical Connectors - Corroded and defective electrical connectors can often be problematic. So, to add some spark to your ride you definitely need the perfect quality connectors offered at Parts Avatar. Isn’t that just the perfect deal?
3. Scanner - Having problems with the scanner? Don’t you worry, Parts Avatar has it all. A faulty scanner could end up being the root cause behind the error code P0856.
4. Park/Neutral Switch - A malfunctioning park/neutral switch can end up being the chief host inviting the error code P0856. So, replacing one can be one of the wisest decisions to avoid a problematic system.

It is essential 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 P0856 here:

Common Symptoms

A check engine soon warning light located on the instrument cluster illuminates along with the traction control malfunction warning light as the error code P0856 is detected. Apart from the illumination of these warning lights, the traction control system is likely to stop working, that often results in a loss of grip (primarily on slippery or icy conditions). The vehicle is likely to experience a falling fuel economy as well as it is also observed that the transmission may also have a difficult time in shifting, or may at ties fail to shift at all.

Here are some ways with the help of which you will be able to correct the OBD Code P0856

• The wires and connectors in the traction control module should be replaced or repaired
• The ON/OFF switch in the traction control module should be mended or restored
• The traction control module should be changed

There is no need to be anxious as Parts Avatar – Car Parts Online is here to help you out! We have high grade powertrain control module, connectors, scanner, park/neutral switch, trailer brake controller, electronic brake control module, automatic transmission module, brake rotors, shift solenoid, body control module, brake proportioning valve, brake switch, transmission sensor, electronic control module, pressure control solenoid and a lot more for our precious customers.

Here are some steps which you should follow in order to diagnose this fault code:

A standard OBD-II trouble code scanner should be used to diagnose this trouble code P0856. The scanner will be used to check and view the freeze frame data and assess the code by a certified technician. The technician should also check for additional trouble codes stored. After the repairs have been performed, the codes should be retested and the vehicle should be restarted to see if the code pertains. If the code disappears it could likely be due to a faulty diagnose or may represent an intermittent issue.

The technician should visually inspect the electrical components in the traction control system in case the code returns. Any loose, damaged or burnt wires in the connectors in the traction control system should be checked and replaced as per requirements. If observed, the ON/OFF switch should be replaced if damaged. It is advised to retest and reset the vehicle every time replacements of the components are made. This helps in bringing out a clear picture of the error code, whether if it has been resolved or if requires more work.

Common Mistakes When Diagnosing the P0856 Code

Here are a few common mistakes that should be avoided while diagnosing the error code P0856:

The failure to stick to the OBD-II trouble code diagnosis protocol is one of the most common mistakes made while diagnosing the P0856 code. To ensure the efficiency and the accuracy of the diagnosis, all technicians should follow the protocol properly,

The most common mistake is when the traction control module is replaced while actually the only problem was a malfunctioning ON/OFF switch or some other defective electrical components.