PTO Speed Selector Sensor/Switch 2 Circuit Low
The P255C code indicates that the Powertrain Control Module (PCM) has detected a low voltage condition in the circuit of the PTO (Power Take-Off) speed selector sensor or switch 2. This sensor/switch is used to monitor the PTO speed selection, typically on vehicles equipped with a PTO unit. A low voltage reading suggests a short to ground, open circuit, or a faulty sensor/switch, which can prevent proper PTO operation.
1. Most Common Causes
- Faulty PTO speed selector sensor/switch 2
- Short to ground in the sensor circuit
- Open circuit or broken wire in the sensor harness
- Corroded or loose connector at the sensor
- Failed PCM (rare)
2. Symptoms You Will Notice
- PTO inoperative or erratic operation
- Check Engine Light illuminated
- PTO speed not selectable or incorrect speed
- Possible transmission or driveline issues
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to retrieve all stored codes and freeze frame data.
Step 2: Visually inspect the PTO speed selector sensor/switch 2 and its wiring for damage, corrosion, or loose connections.
Step 3: Test the sensor/switch resistance and compare to manufacturer specifications; replace if out of range.
Step 4: Check for short to ground or open circuit in the sensor wiring using a multimeter.
Step 5: If wiring and sensor are okay, test the PCM output signal; if no signal, suspect PCM failure.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally safe to drive, but the PTO may not function properly. If the PTO is critical for your work, have it repaired promptly.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for parts and labor, depending on the sensor price and accessibility.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.