How serious is the code?
Clearly, a P0857 diagnostic code is extremely serious and can affect your vehicle’s safety. If your vehicle has this fault code, be extremely cautious when driving in low-traction conditions, and have a mechanic diagnose the problem as soon as possible.
Symptoms
Symptoms of a P0857 include:
- The traction control system is not working
- Harsh, delayed, or erratic shifting
- Limp mode
Causes
- 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 an OBDII P0857 fault code, it is important to first check the condition of the wiring and connectors. If the vehicle has a traction control on/off switch, inspect it for signs of water damage and broken or corroded connectors. If no issues are found so far, the traction control module and ABS control module should be considered.