Powertrain, generic · Vehicle speed, idle control and auxiliary inputs

P05DD Brake Pedal Position Sensor B Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

Brake-by-wire and hybrid systems use a dual-channel pedal travel sensor; channel B runs opposite to A at Toyota (3.6–4.4 V at rest, falling when pressed), so a common fault of both channels shows up. It feeds brake assist and regenerative blending; CARB requires inputs used by other diagnoses to be monitored. A channel fault blocks the A/B correlation P05E0 and usually limits brake assist or regeneration. P05DD means channel B is below its valid range – signal or shared 5 V reference shorted to ground (then sensor A reports as well). Mitsubishi's 2022 Outlander PHEV sets it with the regeneration warning light and the check engine light; for channel A it uses below 0.2 V for 0.5 s.

Likely causes

Signal line B shorted to ground (harness at the pedal box)
5 V reference shorted to ground (also sensor A code)
Pedal sensor faulty
Brake or hybrid module

Symptoms

  • Brake or regeneration warning light
  • Check engine light
  • Regeneration or brake assist reduced, pedal feel changed

Repair estimate

DifficultyHardWorkshop job
Parts and labour€80–600
Time1–3 h

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

Parts involved

brake pedal position sensor bsensor wiringbrake control module

Related codes

P05DBP05DCP05DEP05DFP057CP05E0

References: mitsubishitechinfo.com, mitsubishitechinfo.com, law.cornell.edu.