Powertrain, generic (extended)

P260A PTO Control Circuit/Open

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

P260A reports an open circuit in the output a control module uses to engage the power take-off, typically the coil circuit of a PTO relay or engagement solenoid. GM's PTO module on 2008-2014 Silverado/Sierra 3500 HD chassis cabs, described in upfitter bulletin UI 80c, switches both the supply and the ground side of an upfitter-installed relay and refuses PTO operation unless both lines are connected; GM also notes that the relay output is disabled from the factory and must be programmed on. GM's PTO code table lists the low and high faults of this relay output, but not P260A, so no manufacturer documents this exact code publicly. CARB defines a PTO unit as engine-driven equipment for bodies such as dump beds or winches. The PTO stays disengaged, while normal driving is unaffected.

Likely causes

Relay coil wiring missing, broken or only one side connected by the upfitter
Open coil in the PTO relay or engagement solenoid
Corroded or loose connector in the chassis wiring

Symptoms

  • PTO does not engage
  • PTO indicator flashes or stays off

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

P260BP260CP260DP251A

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