P260B code meaning
PTO Control Circuit Low
What P260B means
P260B is stored when the PTO control output reads too low, the classic case being a grounded wire leading to the PTO relay coil. GM documents the code as P260B.00, a low voltage on the PTO relay control line, among the faults the PTO module can set on 2008-2014 Silverado and Sierra 3500 HD chassis cabs. That module drives both ends of an upfitter-supplied relay, energizes it when the in-cab switch requests PTO and drops it again once engine speed is back at base idle; a ground fault on its control side therefore prevents engagement. Because the relay and its wiring are added by the body builder, their routing and protection deserve the first look. P260A is the open circuit, P260C the high-side fault. The truck still drives, only the PTO stays off.
P260B at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P260B
- PTO cannot be engaged
- Message or flashing PTO indicator
Common causes of P260B
- Most likelyRelay control wire chafed against the frame or body
- PossibleShorted coil in the PTO relay or solenoid
- Less likelyRelay wired incorrectly during body installation
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Pto engagement solenoidPto relayWiring harness
What each part of P260B means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 6 | Area: computer (engine control module) and output circuits. |
| 0B | The exact fault in that area. |
What to do next
- Note P260B and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P260B
What does P260B mean?
P260B means "PTO Control Circuit Low". P260B is stored when the PTO control output reads too low, the classic case being a grounded wire leading to the PTO relay coil. It is a generic code, so it means the same on every make.
Is it safe to drive with P260B?
P260B does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will P260B fail an emissions test?
P260B is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is P260B to fix?
Difficulty: medium. A typical repair takes 0.5 to 2.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P260B clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.