Powertrain, generic (extended)

P2126 Throttle/Pedal Position Sensor/Switch E Circuit Range/Performance

Check engine lightUsually off
EmissionsRelevant
Drive cycleNot required
Limp modePossible

Signal E is electrically intact but its value does not fit the situation. Ford's 2012 OBD summary uses P2126 for the second pedal sensor on Gen2 throttle systems: it sets when sensors D and E disagree by more than 1.1 degrees, as a non-MIL fault with the wrench lamp. Mitsubishi lists P2126 as accelerator pedal sensor E on the 2022 Outlander. Many newer systems report the same disagreement as P2138 instead. P2125 is the general circuit fault, P2127/P2128 are voltage below or above limits, P2129 covers dropouts. The vehicle usually stays drivable with softened pedal response; on Ford the MIL stays off and only the wrench lamp lights.

Likely causes

Worn or dirty sensor track E giving offset readings
Contact resistance at the pedal connector
Shared reference or ground circuit shifting one signal

Symptoms

  • Wrench or engine warning lamp on
  • Softened or delayed acceleration
  • Idle may be raised when braking

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

accelerator pedal position sensorpedal sensor wiringecm

Related codes

P2125P2127P2128P2129P2138P2121

References: newtonnet.co.uk, static.nhtsa.gov, law.cornell.edu.