Powertrain, generic (extended)

P260B PTO Control Circuit Low

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

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.

Likely causes

Relay control wire chafed against the frame or body
Shorted coil in the PTO relay or solenoid
Relay wired incorrectly during body installation

Symptoms

  • PTO cannot be engaged
  • Message or flashing PTO indicator

Repair estimate

DifficultyMediumDIY possible
Parts and labour€30–400
Time0.5–2.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

pto engagement solenoidpto relaywiring harness

Related codes

P260AP260CP251B

References: gmupfitter.com, law.cornell.edu.