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

P05DB Brake Pedal Position Sensor B Circuit/Open

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. P05DB is the general circuit or open-circuit fault of channel B. Toyota's electronically controlled brake (RAV4 Hybrid 2024–25) reports channel B faults under it; while it is stored, the A/B correlation does not run.

Likely causes

Harness or connector at the pedal sensor (open, contact fault)
Pedal sensor assembly faulty
Retrofitted wiring near the pedal (e.g. trailer brake controller)
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

P05DCP05DDP05DEP05DFP057AP05E0

References: estimateca.mymitchell.com, law.cornell.edu.