Chassis, generic

C0042 Brake Pedal Position Sensor Circuit A

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

Covers circuit A of the brake pedal position sensor, which reports how far the pedal is pressed rather than just on/off like a switch. The brake or stability module uses this analog signal for brake-by-wire assist, regenerative braking blending and precise stop-lamp and cruise control. The module sets the code for a signal outside the valid voltage range, an open or short, or a value that disagrees with the pedal switch or a second sensor channel. Chrysler documents C0042 on 2015-2017 Durango and Grand Cherokee alongside P0572, with the brake lamps remaining lit or cruise control failing to engage, and prescribes checking and relearning the pedal rest position. A fault can disable assist and cruise functions and set a warning lamp.

Likely causes

Pedal position sensor out of range
Pedal home position not learned
Harness or connector fault

Symptoms

  • Brake lights stay on
  • Cruise control will not set
  • ABS or brake warning lamp on

Repair estimate

DifficultyMediumDIY possible
Parts and labour€40–350
Time0.4–1.5 h

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

Parts involved

brake pedal position sensor

Related codes

C0043C0040C0041

References: static.nhtsa.gov, en.wikipedia.org.