What Does P260B Mean?
The PCM detected abnormally low voltage in the PTO control circuit. This indicates a short to ground in the wiring, a failed switch, or internal control module issues preventing proper PTO engagement control.
Common Causes
40%
PTO control wiring shorted to ground
25%
Failed PTO switch with internal short to ground
20%
Damaged PTO control relay with shorted coil
10%
Corroded connector causing short circuit at PTO solenoid
5%
Faulty PCM internal driver circuit
Diagnostic Steps
1
Step 1: Disconnect PTO switch and measure resistance to ground; should read infinite (open circuit)
2
Step 2: Disconnect PTO relay/solenoid and check for short to ground on control wire from PCM; should read open
3
Step 3: Inspect entire PTO wiring harness for pinched, chafed, or damaged insulation causing ground shorts
4
Step 4: Test PTO switch operation and internal resistance; verify switch opens and closes properly without resistance to ground
5
Step 5: With all components disconnected, check PCM driver circuit voltage output; should show battery voltage when commanded
Estimated Repair Cost
$120 - $500
Parts + labor, varies by vehicle and location
The PCM detected abnormally low voltage in the PTO control circuit. This indicates a short to ground in the wiring, a failed switch, or internal control module issues preventing proper PTO engagement control.
The most common cause of P260B (PTO Control Circuit Low) is: PTO control wiring shorted to ground
Typical repair costs for P260B range from $120 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive but PTO will not function. May cause unwanted PTO engagement attempts; ensure mechanical disengagement before operation.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P260B to identify the root cause.
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Quick Info
Category
Powertrain
System
Power Take-Off System
Difficulty
Type
Generic (SAE)
Recommended Tools
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