PTO Speed Selector Sensor/Switch 2 Range/Performance
The P255B code indicates that the Powertrain Control Module (PCM) has detected a range or performance issue with the PTO (Power Take-Off) speed selector sensor or switch circuit 2. This sensor monitors the PTO engagement speed and position. The code sets when the signal from the sensor is outside the expected range or does not match the commanded state, often due to a faulty sensor, wiring issues, or a mechanical problem with the PTO system.
01. Most Common Causes
- Faulty PTO speed selector sensor/switch
- Damaged or corroded wiring/connectors in the sensor circuit
- Mechanical binding or failure of the PTO mechanism
- PCM software or hardware issue (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- PTO inoperative or erratic operation
- Reduced engine power or limp mode
- Unusual noises from PTO area
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 sensor and wiring for damage, corrosion, or loose connections.
Step 3: Test the sensor's resistance and voltage output per manufacturer specifications.
Step 4: Check for mechanical binding or damage to the PTO assembly.
Step 5: If all else is normal, update PCM software or replace PCM as last resort.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with this code as it may cause the PTO to malfunction or the vehicle to enter limp mode, potentially leading to unsafe driving conditions.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and sensor replacement, but can be higher if wiring repairs or PCM replacement is needed.