Powertrain, generic (extended)

P258E PTO Enable Switch Performance

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

P258E is the plausibility check of the power take-off enable switch. The line is not open or shorted – those faults are P251A to P251C – but the state of the switch does not fit the other PTO inputs, for instance an enable request without a valid arming step or contact signals that contradict each other. GM lists P258E among the PTO module codes in UI Bulletin 80C for Silverado and Sierra chassis cabs: the in-cab rocker delivers three mode signals that the module decodes so that every press is cross-checked, and an upfitter's remote enable switch only works if the arming button was pressed within five seconds before. GM warns upfitters against load-engage switches because they defeat these diagnostics. The truck still drives; the PTO refuses to engage or drops out.

Likely causes

PTO switch contacts worn or contaminated, mode signals disagree
Upfitter wiring or load-engage switch interfering with the enable input
Remote enable used without arming sequence or with wrong switch type
PTO module configuration not matching the installed switches

Symptoms

  • PTO cannot be switched on or switches off unexpectedly
  • Driver information message about PTO conditions

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–500
Time0.5–3 h

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

Parts involved

pto enable switch

Related codes

P251AP251BP251C

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