Powertrain, generic (extended)

P260D PTO Engaged Lamp Control Circuit

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

P260D concerns the output that drives the lamp or LED telling the operator that the power take-off is engaged; the module has found a fault in that lamp circuit. For GM's heavy-duty pickup chassis cabs, upfitter bulletin UI 80c explains how such an indicator behaves: the LED in the PTO switch blinks quickly while the relay is energized, turns steady once load feedback confirms engagement or after 3 s without feedback, and blinks slowly when a memory speed is stored. A remote PTO indicator can be wired as well. GM's PTO code table does not list P260D, and no other maker documents it publicly. The PTO itself may work normally, but the operator loses the visual confirmation, which matters for safe work with tippers, cranes or pumps. P260A to P260C cover the control circuit itself.

Likely causes

Failed indicator lamp or LED
Open or shorted wire to the indicator, often in add-on wiring
Fault in the PTO switch assembly with integrated LED

Symptoms

  • PTO indicator stays dark or lit regardless of PTO state
  • PTO itself works normally

Repair estimate

DifficultyEasyDIY possible
Parts and labour€10–250
Time0.3–1.5 h

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

Parts involved

pto indicator lampinstrument clusterwiring harness

Related codes

P260AP260BP260CP251A

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