P05DFBrake Pedal Position Sensor B Circuit Intermittent/Erratic
- 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. P05DF means channel B jumps or is noisy within its valid range – loose contacts or brief interruptions. Toyota lists it as a channel B code that blocks the correlation check; no admissible manufacturer document available to us gives thresholds.
- What you may notice
- Sporadic brake warning and check engine light
- Regeneration cutting out at times
- Code often only stored as history
- Likely causes
- LikelyLoose contact or fretting corrosion at the sensor connector
- PossibleBroken or chafed wire in the moving pedal area
- PossibleSensor track or Hall element worn
- RareInterference on the shared 5 V reference
- 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.