P0855 OBD-II: Drive Switch Input Circuit High
P0855 Severity
Should you fix P0855 yourself?
Identifying an OBD code is just the start of a complete diagnostic routine. Most trouble codes are caused by a sensor reporting a value that is out of range. Just replacing a sensor may not fix underlying issues. Be sure to understand the code, the part or system in your car that the code refers to, and the risks of delaying professional repair.
Proper diagnosis will save you time and money on unnecessary repairs.
Urgent codes indicate immediate action is necessary. These are urgent and significant malfunctions that can cause severe damage to the vehicle or harm the driver and passengers.
What causes OBD-II fault code P0855?
The Overdrive/Tow Switch allows the driver to tell the engine computer (PCM) if the vehicle is towing anything so that the transmission can perform accordingly. If the switch sends the PCM an implausible signal, code P0855 will be stored.
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