PTO Speed Selector Sensor/Switch 2 Circuit/Open
The P255A code indicates an open circuit in the Power Take-Off (PTO) speed selector sensor/switch 2 circuit. This sensor monitors the PTO speed setting and sends a signal to the PCM. An open circuit means there is a break in the wiring or a faulty sensor/switch, preventing the PCM from reading the PTO speed selector position. This can affect PTO operation and may cause the vehicle to enter a failsafe mode.
1. Most Common Causes
- Open circuit in the PTO speed selector switch/sensor #2 signal wire (broken or disconnected)
- Open circuit in the 5V reference or ground wire
- Damaged, corroded, or loose connector at the speed selector switch
- Faulty PTO speed selector switch/sensor #2 (internal failure)
- Failed PCM (rare)
2. Symptoms You Will Notice
- PTO inoperative or erratic operation
- Check Engine Light illuminated
- Reduced engine power or limp mode
- PTO speed selector not responding
3. 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 2 connector and wiring for damage, corrosion, or loose connections.
Step 3: Using a multimeter, check for continuity in the circuit between the sensor and PCM. Repair any open or short.
Step 4: If wiring is intact, test the sensor/switch resistance per manufacturer specs; replace if out of range.
Step 5: Clear codes and test drive to verify repair. If code returns, check PCM for faults.
4. 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, reducing drivability and potentially causing safety issues.
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. Sensor replacement is usually under $100.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.