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U013C Lost Communication With Accelerator Pedal Module

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

U013C applies to an accelerator pedal module that reports over a data bus instead of analog sensor lines. In a drive-by-wire system the pedal module carries the driver's torque request to the engine or drive controller, so that controller has to fall back to a safe state as soon as the pedal messages disappear. No manufacturer documents U013C publicly; most pedals still use two analog tracks, whose faults appear as circuit codes such as P2122 or P2127 instead. CARB requires lack of communication from a digital input to be detected separately and stored as its own fault code. U043D covers implausible pedal data. Expect reduced power or idle only, a warning lamp and, depending on the manufacturer, the MIL.

Likely causes

Loose or corroded connector at the pedal module (footwell moisture)
Supply, ground or bus wiring of the pedal module faulty
Accelerator pedal module internally faulty

Symptoms

  • No response to the accelerator, engine stays at idle
  • Reduced power warning
  • MIL on depending on the manufacturer

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€60–700
Time0.5–3 h

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

Parts involved

accelerator pedal modulecan bus wiring

Related codes

U043DP2122P2127U0100

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