PTO Speed Selector Sensor/Switch 2 Circuit High
The P255D code indicates that the Powertrain Control Module (PCM) has detected a high voltage condition in the circuit of the PTO (Power Take-Off) speed selector sensor/switch 2. This sensor monitors the position or speed of the PTO selector, and a high voltage reading suggests a short to power, a faulty sensor, or a wiring issue. The PTO system is used in trucks and commercial vehicles to operate auxiliary equipment like winches or hydraulic pumps.
1. Most Common Causes
- Faulty PTO speed selector sensor/switch 2
- Short to voltage in the sensor circuit
- Damaged wiring or connector
- Corroded pins or poor electrical connection
- Faulty PCM (rare)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- PTO system inoperative or erratic operation
- Inability to engage or disengage PTO
- Reduced engine power or limp mode
3. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for additional codes.
Step 2: Visually inspect the PTO sensor wiring and connector for damage, corrosion, or loose pins.
Step 3: Disconnect the sensor and measure voltage at the harness connector; compare to manufacturer specifications.
Step 4: Test the sensor resistance and continuity; replace if out of spec.
Step 5: If wiring and sensor are good, check for a short to power and repair as needed.
Step 6: Clear the code and test drive to verify repair.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally safe to drive short distances, but the PTO system may not function properly. If the vehicle enters limp mode, it should be repaired promptly.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and repair, depending on labor rates and parts needed.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.