P0858 Fault Code

Traction Control Input Signal Low

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

The P0858 fault code indicates that the traction control system is receiving a low input signal from one or more of its sensors. This can affect vehicle stability and traction, especially during accelerations, turns, or slippery conditions. The traction control system is essential for maintaining control over the vehicle by adjusting the throttle and brakes when it detects a loss of traction.

What are the symptoms of the P0858 code?

Drivers may experience a number of symptoms when the P0858 code is triggered, including:

• Traction control warning light illuminated on the dashboard
• Reduced engine power or hesitation during acceleration
• Inconsistent or delayed engagement of traction control system
• Difficulty maintaining control of the vehicle in slippery conditions
• Increased tire spin during acceleration

What causes the P0858 code?

There are several potential causes for a low traction control input signal, including:

• Faulty wheel speed sensors
• Poor electrical connections or damaged wiring
• Malfunctioning traction control module
• Issues with the brake system, such as low brake fluid
• Problems with the anti-lock braking system (ABS)
• Incorrect installation of tire size affecting the sensors

How to fix P0858?

To resolve the P0858 fault code, a technician will typically:

• Perform a thorough inspection of the wheel speed sensors and their wiring harnesses
• Ensure that all electrical connections are clean, tight, and free from corrosion
• Check for any trouble codes that may provide further insight into the problem
• Test the traction control module as well as the ABS for proper functionality
• Replace any faulty sensors, wiring, or components as necessary
• Clear the fault codes and perform a road test to confirm that the issue has been resolved.