Powertrain, generic (extended)

P2139 Throttle/Pedal Position Sensor/Switch D/F Voltage Correlation

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2139 compares signals D and F, in practice the first and third tracks of a three-track accelerator pedal. No manufacturer publishes a detection rule for this exact code; FCA only lists P2139 in emissions recall T21 for the 2004-2006 Dodge Sprinter among codes that can appear after the ECU update. Makers with three-track pedals handle the comparison differently: GM's 2004-2005 trucks scale sensor 3 and test it against sensors 1 and 2 at 0.26 V, then blame the odd track through P2131 or P2126 instead of naming a pair, and Ford reports a deviating track F as P2131. A pair code like P2139 cannot say which of the two tracks is wrong, so check both with a scope while moving the pedal. Effects are a warning lamp and softened acceleration.

Likely causes

Track D or F of the pedal sensor worn or drifted
Contact resistance at the pedal connector
Fault on a shared ground or 5 V reference

Symptoms

  • Engine or wrench warning lamp on
  • Softened or delayed acceleration

Repair estimate

DifficultyEasyDIY possible
Parts and labour€20–350
Time0.3–1.5 h

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

Parts involved

throttle position sensoraccelerator pedal position sensor

Related codes

P2138P2140P2131P2121P2130P212F

References: static.nhtsa.gov, gsi.ext.gm.com, newtonnet.co.uk.