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 or switch 2. This sensor/switch is used to select the PTO speed and is typically part of the vehicle's PTO system, which is common in trucks and commercial vehicles. A high voltage reading suggests a short to power, a faulty sensor/switch, or a wiring issue. This can prevent the PTO from engaging or operating correctly, affecting auxiliary equipment operation.
01. Most Common Causes
- Faulty PTO speed selector sensor/switch 2
- Short to voltage in the sensor circuit
- Damaged wiring or connector
- Corroded or loose electrical connections
- Faulty PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- PTO inoperative or erratic operation
- Inability to select PTO speed
- Possible drivability issues if PTO is engaged
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to retrieve all codes and freeze frame data.
Step 2: Visually inspect the PTO speed selector sensor/switch and its wiring for damage, corrosion, or loose connections.
Step 3: Disconnect the sensor and measure voltage at the harness connector; compare to manufacturer specifications.
Step 4: Test the sensor/switch resistance and continuity; replace if out of spec.
Step 5: If wiring and sensor are okay, check for a short to power in the circuit and repair as needed.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It may be safe to drive if the PTO is not needed, but the Check Engine Light will remain on. However, if the PTO engages unexpectedly, it could cause a safety hazard. It's best to diagnose and repair promptly.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and repair, including parts and labor. Replacing the sensor/switch is usually inexpensive, but wiring repairs may add to the cost.