Technical Description of OBD-II Trouble Code
PTO Speed Selector Sensor/Switch 2 Range/Performance
What does that signify?
This is a generic powertrain diagnostic trouble code (DTC) that is applicable to various OBD-II vehicles (1996-newer). This includes vehicles from Ford, GMC, Chevy, Dodge, Ram, etc. Although it is a generic code, the specific repair steps may vary depending on the year, make, model, and powertrain configuration.
OBD-II trouble code P255B and its related codes P255A, 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 connected to the vehicle’s transmission and is used to operate auxiliary equipment such as snow plows, dump beds, etc.
When the PCM detects voltage or resistance in the PTO speed selector sensor/switch 2 circuit that is outside the expected range or performance parameters, code P255B will be triggered and the check engine light, service engine soon light, or both may illuminate.
What is the severity of this DTC?
This code is generally not severe as it is likely to only affect PTO functions and not regular vehicle functions.
What are some of the symptoms of the code?
Symptoms of a P255B trouble code may include:
What are some of the common causes of the code?
Causes for this P255B code may include:
What are some P255B troubleshooting steps?
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 inspect them for any obvious physical damage. Conduct a thorough visual inspection to check the associated wiring for any visible defects such as scraping, rubbing, bare wires, or burn spots. Next, check the connectors and connections for security, corrosion, and damaged pins. This process should include all wiring connectors and connections to all components, including the PCM. Consult the specific technical 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 Steps
The 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 purely informational, and the specific technical data and service bulletins for your vehicle should always take priority.
