P05DC: Brake Pedal Position Sensor B Circuit Range/Performance

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. P05DC means channel B leaves its learned or permitted working range without a clear short – for example from a misadjusted or uncalibrated sensor or contact resistance. No admissible manufacturer document available to us gives thresholds for it.

Symptoms

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

Most likely causes

• Pedal sensor misadjusted, misassembled or not calibrated
• Contact resistance on signal line B
• Sensor worn internally
• Brake module

What to check, in order

Start with the simplest. You can tick off each step.

1. Check the pedal and throttle connectors
2. Compare the reading with other engine data while varying the engine speed.
3. Use live data to confirm that both sensors rise smoothly and consistently
4. Clean the throttle if it has carbon buildup
5. Run the relearn procedure with the scanner if the manufacturer requires it
6. Replace the part identified by the diagnosis

Good to know

• Repair difficulty: hard
• It can trigger limp mode.
• It affects emissions.

What each character of P05DC means

• P: Powertrain: engine and transmission
• 0: Generic code: same on every make
• 5: Speed and idle
• DC: Specific fault in that system

Frequently asked questions

Can I keep driving with code P05DC?

Be careful: the car may suddenly lose power. If it goes into limp mode, get off the highway and calmly make your way to a repair shop.

What causes code P05DC?

The most common causes are: pedal sensor misadjusted, misassembled or not calibrated; contact resistance on signal line B; sensor worn internally.

Related codes

• P05DBBrake Pedal Position Sensor B Circuit/Open
• P05DDBrake Pedal Position Sensor B Circuit Low
• P05DEBrake Pedal Position Sensor B Circuit High
• P05DFBrake Pedal Position Sensor B Circuit Intermittent/Erratic
• P057BBrake Pedal Position Sensor A Circuit Range/Performance
• P05E0Brake Pedal Position Sensor A/B Correlation

Sources

• estimateca.mymitchell.com: RM100000002GAKZ
• law.cornell.edu: 13 CCR 1968.2

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.