P0857 Fault Code

Traction Control Input Signal Range/Performance

• What does that mean?
• Symptoms
• Causes
• Solutions

The P0857 fault code indicates a problem with the traction control input signal range or performance. This typically occurs when the traction control system detects an issue with the signal being received from the input sensor, which can affect the vehicle's handling and stability. It is a part of the onboard diagnostics for the traction control system, helping to enhance safety while driving under different conditions.

What are the symptoms of the P0857 code?

Symptoms of a P0857 fault can manifest as:

• Warning lights on the dashboard, typically the traction control or ABS light
• Reduced traction control functionality
• Unusual or inconsistent handling of the vehicle
• Activation of the traction control system at inappropriate times
• Engine performance issues if the vehicle goes into limp mode

What causes the P0857 code?

Common causes for the P0857 code include:

• Faulty traction control input sensor
• Damaged wiring or connectors leading to the traction control system
• Issues with the powertrain control module (PCM)
• Malfunctioning brake switch
• Improper calibration or configuration of the traction control system

How to fix P0857?

To resolve the P0857 fault code, you should:

• Begin by performing a thorough inspection of the traction control input sensor and related wiring
• Check the brake switch and ensure it is functioning properly
• Replace any damaged or corroded connectors
• If the sensor and wiring are good, consider reprogramming or updating the software for the traction control system
• In some cases, replacing the traction control input sensor or the PCM may be necessary if they are determined to be faulty.