What Does P255A Mean?
The PCM has detected an open circuit or electrical fault in the Power Take-Off (PTO) speed selector sensor/switch circuit number 2. This affects vehicles equipped with PTO systems for auxiliary equipment operation.
Common Causes
35%
Open or broken wiring in PTO speed selector switch circuit
30%
Faulty PTO speed selector switch or sensor with internal open circuit
20%
Disconnected or corroded connector at PTO switch or control module
10%
Blown fuse or faulty relay in PTO control circuit
5%
PTO control module internal fault or poor ground connection
Diagnostic Steps
1
Step 1: Locate and inspect PTO speed selector switch and connector for damage, corrosion, or loose connections
2
Step 2: Check PTO circuit fuse and relay operation, verify power supply to switch
3
Step 3: Test continuity of wiring between PTO selector switch and control module/PCM
4
Step 4: Measure resistance across PTO switch terminals in various speed selector positions per specifications
5
Step 5: Monitor PTO switch signal voltage or state with scan tool while cycling through speed selector positions
Estimated Repair Cost
$120 - $450
Parts + labor, varies by vehicle and location
The PCM has detected an open circuit or electrical fault in the Power Take-Off (PTO) speed selector sensor/switch circuit number 2. This affects vehicles equipped with PTO systems for auxiliary equipment operation.
The most common cause of P255A (PTO Speed Selector Sensor/Switch 2 Circuit/Open) is: Open or broken wiring in PTO speed selector switch circuit
Typical repair costs for P255A range from $120 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
PTO auxiliary equipment will not function properly or may not operate at all. Does not affect primary vehicle drivability or safety.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P255A to identify the root cause.
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Quick Info
Category
Powertrain
System
PTO Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
