What Does P255B Mean?
The PTO speed selector sensor/switch 2 signal is reading outside expected parameters or showing implausible values. The switch position does not correlate with commanded PTO operation or other system inputs.
Common Causes
40%
PTO speed selector switch providing intermittent or incorrect position signals
25%
Intermittent wiring fault or poor connection causing erratic signals
20%
PTO switch misadjusted or mechanically binding in detent positions
10%
Voltage supply issue to PTO switch causing irregular signal output
5%
PTO control module receiving conflicting signals from multiple sensors
Diagnostic Steps
1
Step 1: Monitor PTO switch signal values with scan tool while moving selector through all positions slowly
2
Step 2: Inspect PTO selector switch mechanical operation for binding, damage, or incorrect adjustment
3
Step 3: Check reference voltage supply to PTO switch (typically 5V or 12V) for stability
4
Step 4: Test PTO switch resistance or voltage output at each detent position and compare to specifications
5
Step 5: Perform wiggle test on switch connector and wiring while monitoring signal to identify intermittent faults
Estimated Repair Cost
$130 - $500
Parts + labor, varies by vehicle and location
The PTO speed selector sensor/switch 2 signal is reading outside expected parameters or showing implausible values. The switch position does not correlate with commanded PTO operation or other system inputs.
The most common cause of P255B (PTO Speed Selector Sensor/Switch 2 Range/Performance) is: PTO speed selector switch providing intermittent or incorrect position signals
Typical repair costs for P255B range from $130 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
PTO may engage at incorrect speeds or fail to operate, affecting auxiliary equipment performance. Does not impact vehicle driving safety.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P255B to identify the root cause.
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Quick Info
Category
Powertrain
System
PTO Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
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