P05DBBrake Pedal Position Sensor B Circuit/Open
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- 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.
- What you may notice
- Brake or regeneration warning light
- Check engine light
- Regeneration or brake assist reduced, pedal feel changed
- Likely causes
- LikelyHarness or connector at the pedal sensor (open, contact fault)
- PossiblePedal sensor assembly faulty
- RareRetrofitted wiring near the pedal (e.g. trailer brake controller)
- RareBrake or hybrid module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €80 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.