The P0858: Traction Control Input Signal Low refers to a condition where the traction control system is receiving a lower-than-expected voltage signal. This can be caused by a faulty sensor, wiring problems, or an issue with the traction control module or transmission control module (TCM). Proper voltage levels are critical for the traction control system to function effectively, ensuring vehicle stability and safety.
P0858 – Quick Overview
Code | Information |
---|---|
Meaning | P0858: Traction Control Input Signal Low |
Is it serious? | Yes, it can lead to malfunctioning traction control, affecting vehicle stability and performance on slippery surfaces. |
Possible causes | – Low voltage in the traction control input signal – Faulty sensor or wiring – Faulty traction control module or transmission control module (TCM) |
How to diagnose? | – Test the signal for low voltage – Inspect wiring and connectors – Replace faulty components if needed |
P0858 Meaning
The P0858: Traction Control Input Signal Low code indicates that the voltage in the traction control input signal is below the acceptable range. This low voltage could cause the traction control system to malfunction, reducing its ability to prevent wheel slip and maintain vehicle stability, especially on slippery or uneven terrain.
Step-by-step diagnostic guide
Action | Description | Tools Needed |
---|---|---|
Check for Other Codes | Use an OBD-II scanner to check for additional codes related to the traction control or transmission systems. | OBD-II Scanner |
Inspect Traction Control System | Visually inspect the traction control module, sensors, and related components for signs of damage or wear. | Flashlight, Safety Gloves |
Test the Signal for Low Voltage | Use a multimeter to measure the voltage in the traction control input signal circuit and compare it with manufacturer specifications. | Multimeter |
Check Wiring and Connectors | Inspect the wiring and connectors for damage, corrosion, or loose connections that could cause low voltage in the circuit. | Flashlight, Multimeter |
Replace Faulty Components | If the sensor, wiring, or module is found to be faulty, replace the necessary components to restore proper voltage levels. | Replacement Parts, Basic Tools |
Clear the Code and Test Drive | After repairs, clear the code using an OBD-II scanner and test the vehicle to ensure proper traction control operation. | OBD-II Scanner, Vehicle Owner’s Manual |
Recheck for Codes | After the test drive, re-scan the system to confirm that the P0858 code does not return. | OBD-II Scanner |
OBD-II scanner Buyer’s Guide
- Scanner features explained
- Different types of scanners
- Scanners for coding/odometer/ECU/checks
- Best picks + discount codes
I test OBD-II scanners and make DIY Engine diagnostics guides to help you solve your car problems without having to depend on the mechanic. A lot of them will try to scam you or are just no help at all. About Juraj Lukacko