Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer is not getting a strong enough signal from the traction control system. It's like when your TV remote's batteries are low, and the TV doesn't respond well.
The P0858 code is triggered when the traction control system's input signal to the powertrain control module (PCM) is lower than expected.
The traction control system helps maintain vehicle stability by preventing wheel spin. The PCM monitors the input signal from the traction control system to ensure proper operation. If the signal is too low, it indicates a potential issue with the system's communication or functionality.
• Traction control warning light on
• Reduced traction control performance
• Possibly impaired vehicle stability
• Faulty traction control switch
• Damaged wiring or connectors
• Failed traction control module
PCM: Powertrain Control Module
ABS: Anti-lock Braking System
• Inspect the traction control switch for proper operation.
• Check wiring and connectors for damage or corrosion.
• Test the traction control module for faults.
• Replace the faulty traction control switch.
• Repair or replace damaged wiring or connectors.
• Replace the traction control module if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$100 - $300
Moderate
• Toyota Camry
• Ford Focus
• Honda Accord
• Regularly inspect traction control components.
• Ensure connectors are free from corrosion.
• Keep the vehicle's electrical system in good condition.
Sensor Issue
• Avoid driving in conditions where traction is critical until fixed.
• Get the vehicle inspected by a professional mechanic.
Check if your vehicle's warranty covers electronic system repairs.
This code has been associated with issues in vehicles with electronic traction control systems, especially in models from the early 2000s.
Moderate – Addressing this issue is important for maintaining vehicle stability and safety.
Ignoring this code can lead to safety issues, especially in slippery conditions. Always fix traction control issues promptly.
• Vehicle on a flat surface
• Engine running and in park
The traction control module is typically located near the vehicle's ABS module or integrated within the PCM.
Q: Can I drive with a P0858 code?
A: While you can drive with this code, it's not recommended, especially in slippery conditions, as it may affect vehicle stability.
Q: How does traction control work?
A: Traction control helps prevent wheel spin by adjusting power to the wheels, ensuring better grip and stability.
Pro · Four-system diagnostics
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