P255A PTO Speed Selector Sensor/Switch 2 Circuit /Open
Description and meaning of DTC p255a
This is a generic powertrain diagnostic trouble code (DTC) and applies to many OBD-II vehicles (1996-newer). That may include but is not limited to vehicles from Ford, GMC, Chevy, Dodge, Ram, etc. Although generic, the exact repair steps may vary depending on year, make, model and powertrain configuration. OBD-II trouble code P255A and related codes P255B, P255C, P255D and P255E are associated with the PTO or power take off speed selector sensor/switch 2 circuit. The PTO or power take-off is a system that is linked to the transmission of the vehicle and is used to drive auxiliary equipment. That auxiliary equipment might include things such as snow plows, dump beds, etc. When the PCM detects improper voltage or resistance within the PTO speed selector sensor/switch 2 circuit, code P255A will be set and the check engine light, service engine soon light or both may be illuminated.
p255a diagnostic trouble code symptoms
Symptoms of a P255A trouble code may include:Auxiliary PTO equipment will not functionCheck engine light illuminated
DTC p255a - possible causes
Causes for this P255A code may include:Defective PTO sensorOpen or short in PTO sense circuitFaulty or damaged wiringCorroded, damaged or loose connectorDefective fuse or fuse-able link (if applicable)Defective PCM
How to fix OBD-II diagnostic trouble code p255a
The first step in the troubleshooting process for any malfunction is to research the Technical Service Bulletins (TSB's) for the specific vehicle by year, model and engine/transmission configuration. In some circumstances, this can save a lot of time in the long run by pointing you in the right direction. The second step is to locate all components associated with the PTO power take-off circuit and look for obvious physical damage. Perform a thorough visual inspection to check the associated wiring for obvious defects such as scraping, rubbing, bare wires, or burn spots. Next is to check the connectors and connections for security, corrosion and damaged pins. This process must include all wiring connectors and connections to all components including the PCM. Consult the specific tech data for the vehicle to verify the configuration of the oil level safety circuit and see if a fuse or fuse-able link is incorporated into the circuit. Advanced StepsThe advanced steps become very vehicle specific and require the appropriate advanced equipment to perform accurately. These procedures require a digital multimeter and the specific technical references for the vehicle. In this situation, an oil pressure gauge may facilitate the troubleshooting process. This article is strictly informational and the specific technical data and service bulletins for your vehicle should always take priority.