The P0859 trouble code indicates that the traction control input signal is registering as high. Here’s what you need to know about this code:
P0859 Traction Control Input Signal High
Code symptoms P0859.
1. Illumination of the traction control warning light on the dashboard.
2. Possible disabling of the traction control system.
3. Reduced vehicle stability during acceleration or cornering.
4. Rough or erratic engine operation may occur.
Causes of the code P0859.
1. Faulty traction control switch.
2. Damaged or corroded wiring or connectors in the traction control circuit.
3. Issues with the traction control module (TCM).
4. Sensor malfunction or improper input signal.
Code Solutions P0859.
1. Replace the traction control switch if it’s found to be faulty.
2. Repair or replace any damaged wiring or connectors in the traction control circuit.
3. Ensure proper installation of the traction control switch and secure any wiring harnesses.
4. Reset the fault codes and test drive the vehicle to verify that the issue has been resolved.