Technical Description of OBD-II Trouble Code
The PTO Speed Selector Sensor/Switch 2 is registering a low signal.
What does that indicate?
This is a generic diagnostic trouble code (DTC) that applies to many OBD-II vehicles (1996-newer), including Ford, GMC, Chevy, Dodge, Ram, and others. The specific repair steps may vary depending on the year, make, model, and powertrain configuration of the vehicle.
OBD-II trouble code P255C and related codes P255A, P255B, P255D, and P255E are associated with the PTO or power take off speed selector sensor/switch 2 circuit.
The PTO or power take-off system is connected to the vehicle’s transmission and is used to operate auxiliary equipment such as snow plows and dump beds.
When the PCM detects a voltage or resistance in the PTO speed selector sensor/switch 2 circuit that is lower than the expected range, it will set code P255C and illuminate the check engine light or service engine soon light, or both.
What is the severity of this DTC?
This code is generally not severe as it primarily affects the functionality of the PTO equipment and not the regular vehicle functions.
What are some of the symptoms of the code?
Symptoms of a P255C trouble code may include:
What are some of the common causes of the code?
Possible causes for this P255C code may include:
What are some P255C troubleshooting steps?
The first step in troubleshooting any malfunction is to research the Technical Service Bulletins (TSB’s) specific to the vehicle’s year, model, and engine/transmission configuration. This can save time by providing guidance in the right direction.
The second step is to inspect all components associated with the PTO power take-off circuit for physical damage. Conduct a thorough visual inspection of the wiring for any obvious defects such as scraping, rubbing, bare wires, or burn spots. Check the connectors and connections for security, corrosion, and damaged pins. This includes all wiring connectors and connections to the PCM. Consult the vehicle’s technical data to verify the configuration of the oil level safety circuit and determine if a fuse or fuse-able link is part of the circuit.
Advanced Steps
The advanced steps are vehicle-specific and require advanced equipment for accurate performance. These procedures involve using a digital multimeter and referencing the specific technical information for the vehicle. In this situation, an oil pressure gauge may aid in the troubleshooting process.
This article is for informational purposes only, and the specific technical data and service bulletins for your vehicle should always take precedence.
