Guide To P0858 OBD Error Code Solutions

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See the error code P0858 flashing? Don’t know what to do? Well, this Parts Avatar guide is all you need to treat the error code P0858. The trouble code P0858 is stored when an error is detected in the traction control input signal circuit by the powertrain control module (PCM). the PCM receives data from the traction control input signal circuit via signal which is further utilized to calculate the engine revolutions per minute (RPMs) required, engine timing, and the amount fuel needed for current vehicle traction. This P0858 code strictly focuses on vehicles that have an electronic traction control system installed. P0856, P0857, P0859 and P0860 are the codes that share similarities with the code P0858.

A trouble code P0858 sets in and a check engine light illuminates when the PCM or a related module fails to receive input from the traction control module. The traction control light may also illuminate and the transmission is placed in the limp-in mode in particular models.

What causes this problem with the Traction Control Input Signal Low?

The primary cause triggering the P0858 code is most likely to be a damaged traction control ON/OFF switch. Defective wirings or electrical connectors, corrosion in the sensor connector and liquids spilled into the traction control switch are some general reasons that lead to an error code P0858 being stored.

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3. Electronic Brake Control Module - Want to fight the error code P0858? Well, get that fixed with a new electronic brake control module at Parts Avatar available online at the best prices.
4. Scanner - A malfunctioning scanner can end up being the chief host inviting the error code P0858. So, replacing one can be one of the wisest decisions to avoid a problematic system.

Willing to know some common symptoms of OBD Code P0858? Your wish is our demand. Have a look at them below:

Common Symptoms

The failed operations of a traction control system most obvious in slippery driving conditions is one of the symptoms of the error code P0858. One can encounter issues with shifting gears and increased fuel usage in addition to warning lights. These are some common symptoms observed.

We have listed out some ways which would help you to correct the occurrence of OBD Code P0858. They are mentioned here as follows:

• A defective traction control switch should be replaced or repaired
• All the wirings burnt, defective or loose should be mended or replaced as per requirements
• In order to spare the cost of reprogramming, one should connect the module in question with a memory saver if the control modules are being repaired by themselves
• All the voltage readings should be compared to the manufacturer’ default specifications
• All the codes should be cleared and the vehicles should be test driven after the repairs have been performed to ensure a successful treatment and diagnosis

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If you want to easily diagnose this fault code, then all you have to do is to follow the steps which are mentioned below:

• Firstly, the wirings, connectors and components should all be inspected. It should be verified for any faulty, corroded or defective components.
• Any stored codes or freeze frame data should be downloaded.
• Using a specialized CAN bus scanner, the pins of the CAN bus scanner should be tested for any faults in the wiring and a memory-saving device should be installed.
• The technician should keep in mind the cost and as well the time in mind.
• To check the CAN bus circuits, control modules, connectors and fuses for any defects, a digital volt/ohmmeter should be used.
• It is advised to test for reference voltage and continuity with battery ground while checking the connectors, wirings and other components.
• To check the continuity and ground at the traction control ON/OFF switch, a volt/ohmmeter should be used.
• The codes should be cleared the system should be retested to see if the code returns.

Common Mistakes When Diagnosing the P0858 Code

Here are a few common mistakes that should be avoided while diagnosing the error code P0858:

The most commonly committed mistake is citing the traction control module for being at fault, when in fact the problem might lie in a faulty switch, circuit or connector. The code P0858 might return as a following replacement of the traction control module might fail to fix the cause.