Vehicle traction control systems are designed to help you maintain traction in slippery conditions by mitigating wheel spin. This is an extremely important safety feature, and helps to save many lives each year. A P0857 DTC means that the input signal coming from the traction control system falls outside of the parameters programmed into the ECU.
How Serious is the Code?
Obviously, a P0857 diagnostic trouble code is extremely serious, and can affect the safety of your vehicle. If your vehicle has this trouble code, exercise extreme caution when driving in low traction situations, have a mechanic diagnose the problem as soon as possible.
Symptoms of a P0857 include:
- Traction control system does not work
- Harsh, delayed or erratic shifting
- Limp mode
- Damaged wiring and/or connectors
- Faulty traction control switch
- Faulty electronic brake control module/ABS module
- Faulty traction control module
How to Diagnose the Code?
When diagnosing a P0857 OBDII trouble code, it’s important to first examine the condition of the wiring and connectors. If the vehicle has an on/off switch for the traction control, examine it for signs of water damage and broken or corroded connectors. If no issues are found up to this point, then the traction control module and ABS control module should be considered.
What Repairs Will Fix P0857?
- Repair or replace damaged wiring and/or connectors
- Replace traction control switch
- Replace traction control module
- Replace electronic brake control module / ABS control module