What Does P255C Mean?
The powertrain control module (PCM) has detected an abnormally low voltage signal from the secondary power take-off (PTO) speed selector sensor or switch circuit. This indicates a short to ground, open circuit, or faulty sensor preventing proper PTO speed selection.
Common Causes
35%
Damaged or chafed wiring harness causing short to ground
30%
Faulty PTO speed selector sensor/switch internal failure
20%
Corroded or loose electrical connector at sensor
10%
Open circuit in sensor ground wire
5%
Failed PCM unable to process sensor signal correctly
Diagnostic Steps
1
Step 1: Visually inspect PTO speed selector sensor connector for corrosion, damage, or loose pins
2
Step 2: Measure voltage at sensor connector with key on; should read reference voltage (typically 5V)
3
Step 3: Check continuity of signal wire from sensor to PCM and ground circuit integrity
4
Step 4: Test sensor resistance per manufacturer specifications; replace if out of range
5
Step 5: If all circuits and sensor test good, perform PCM power and ground verification
Estimated Repair Cost
$150 - $450
Parts + labor, varies by vehicle and location
The powertrain control module (PCM) has detected an abnormally low voltage signal from the secondary power take-off (PTO) speed selector sensor or switch circuit. This indicates a short to ground, open circuit, or faulty sensor preventing proper PTO speed selection.
The most common cause of P255C (PTO Speed Selector Sensor/Switch 2 Circuit Low) is: Damaged or chafed wiring harness causing short to ground
Typical repair costs for P255C range from $150 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle may be safe to drive but PTO functionality will be impaired or inoperative. Do not operate PTO equipment until repaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P255C to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Power Take-Off System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
