Network, generic

U0117 Lost Communication With PTO Control Module

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

U0117 points to a lost link with the power take-off (PTO) control module, which engages and governs an engine-driven output for auxiliary equipment such as a tipper body, aerial bucket or recovery winch. CARB defines such a PTO unit and lets the engine controller pause monitor counters while it runs, so dependable PTO status on the bus matters for OBD bookkeeping. Saab's 2011 9-5 and 9-4X U-code lists, both taken over from GM's global electrical architecture, carry the code as loss of the power take-off control module; neither these nor any other maker's documents give timing or lamp rules. U0465 stands for invalid PTO data, P064B for a PTO module fault. For the operator the attached equipment cannot be engaged or its engine-speed control drops out.

Likely causes

Faulty upfitter wiring or connector between chassis and PTO controller
PTO module without power or ground
Vehicle configuration expects a PTO module that is missing or not programmed
PTO control module internally faulty

Symptoms

  • PTO cannot be engaged or disengages
  • Elevated idle or remote engine speed control unavailable
  • Warning message in the cluster

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€60–1,000
Time0.5–4 h

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

Parts involved

pto control modulecan bus wiring

Related codes

U0465P064BU0100

References: saabwisonline.com, saabwisonline.com, law.cornell.edu, en.wikipedia.org.