Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that a part of the car that helps control how fast a special system (like a snow plow or a tow truck winch) is going is not working right. It's like when a toy car's remote control doesn't work properly because the buttons are stuck.
The Power Take-Off (PTO) system allows vehicles to use engine power for auxiliary equipment. The code indicates an issue with the circuit that monitors the speed selector for this system, specifically that the voltage is too high.
The P255D code is triggered when the Engine Control Module (ECM) detects a high voltage condition in the PTO Speed Selector Sensor/Switch 2 circuit. This could be due to a short circuit, a faulty sensor, or a wiring issue.
• Check Engine Light illuminated
• PTO system not functioning properly
• Erratic behavior of connected equipment
• Faulty PTO Speed Selector Sensor/Switch 2
• Short circuit in the wiring harness
• Poor electrical connection in the circuit
PTO: Power Take-Off, a device that transfers engine power to auxiliary equipment.
ECM: Engine Control Module, the computer that controls engine functions.
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for damage or corrosion.
• Test the PTO Speed Selector Sensor/Switch 2 for proper operation.
• Replace the faulty PTO Speed Selector Sensor/Switch 2.
• Repair or replace damaged wiring or connectors.
• Clear the code and test the system for proper operation.
• OBD-II scanner
• Multimeter
• Basic hand tools
$100 - $300
Moderate
• Ford F-Series
• Chevrolet Silverado
• Ram 2500
• Regularly inspect PTO system wiring and connections.
• Ensure proper maintenance of auxiliary equipment.
• Avoid overloading the PTO system.
Sensor Issue
• Avoid using the PTO system until the issue is resolved.
• Consult a professional mechanic if unsure about repairs.
Check with your vehicle manufacturer for specific warranty coverage related to the PTO system.
PTO-related codes have been more prevalent in vehicles equipped with auxiliary systems, especially in commercial and utility vehicles.
Moderate – The vehicle can still be driven, but the PTO system should not be used until the issue is fixed.
Operating a vehicle with a malfunctioning PTO system can be dangerous and may violate safety regulations.
• Vehicle engine running
• PTO system engaged
The PTO Speed Selector Sensor/Switch 2 is typically located near the transmission or the PTO unit itself.
Q: Can I drive my vehicle with this code?
A: Yes, but avoid using the PTO system until the issue is resolved.
Q: Will this code affect my vehicle's performance?
A: It may not affect normal driving, but it will impact the operation of the PTO system.
High-End · Full-system diagnostics
A full-system bidirectional platform aimed at advanced DIY users and professional diagnostic workflows.
Network faults often require full-system access instead of a generic code reader alone.
View on Amazon
Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
Helpful for checking voltage drops, grounds, and basic circuit health when modules are not communicating.
View on Amazon
Universal · Wire connectors and repair kit
Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.