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Home / DTC / P05DB — Brake Pedal Position Sensor B Circuit/Open

P05DB — Brake Pedal Position Sensor B Circuit/Open

Detailed page for trouble code P05DB.

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P05DB

Generic P — Powertrain

Brake Pedal Position Sensor B Circuit/Open

Brand: Generic
Type: P — Powertrain
Views: UK: 14 EN: 33 RU: 15
AI status
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Page language: EN

Causes

  • Open or broken wiring in sensor B circuit
  • Corroded, bent or disconnected connector/pin at sensor or module
  • Short to ground or battery voltage on sensor B signal
  • Failed Brake Pedal Position Sensor (B)
  • Poor sensor or module ground
  • Intermittent contact due to harness chafe or water intrusion

Symptoms

  • Malfunction Indicator Lamp (MIL/Check Engine) illuminated
  • Cruise control may be disabled or will not set
  • Erratic throttle response, limp-home/limited functionality in some drive-by-wire systems
  • Brake lights may be inoperative or behave incorrectly (depending on vehicle architecture)
  • Brake-related warning lights or messages (on some vehicles)

What to check

  • Read stored freeze frame and live data (brake pedal position sensor B and A PIDs) with a scan tool
  • Compare sensor B output to sensor A while operating the brake pedal — values should change smoothly and correlate (often inverse or proportionate depending on design)
  • Visual inspection of harness, connectors, and pedal-area for damage, corrosion, or water intrusion
  • Backprobe sensor connector with ignition ON and measure reference voltage (usually 5V) and ground presence
  • Measure sensor B signal voltage while moving the pedal from rest to depressed position
  • Check continuity between sensor connector and PCM pin for open or high resistance

Signal parameters

  • Reference supply: typically +5.0 V (verify to vehicle spec)
  • Ground: near 0 V reference
  • Signal at rest: commonly ~0.5–1.5 V (varies by design)
  • Signal at full pedal: commonly ~3.5–4.5 V (varies by design)
  • Sensor A vs B relationship: often non-identical (redundant) sweeps — expect smooth, monotonic change without jumps
  • Resistance check (if applicable): sensor resistance should change smoothly across pedal travel — compare to service spec

Diagnostic algorithm

  1. Retrieve DTCs, freeze frame, and live data for brake pedal position sensors A and B. Note values and conditions when code set.
  2. Perform a visual inspection of the pedal area harness and connectors for damage, corrosion, loose pins or water entry.
  3. With ignition ON (engine off), verify the sensor reference voltage (typically 5V) at the sensor connector and a good ground. If reference or ground missing, trace wiring to PCM and repair.
  4. Backprobe the sensor signal pin and slowly depress/release the pedal while observing voltage change. Confirm signal moves smoothly through expected range. If signal is stuck or absent, continue.
  5. If signal is open or intermittent, perform continuity check between sensor signal pin and the PCM pin. Repair any open/high resistance circuits.
  6. Inspect for and repair any shorts to 12V or ground if signal is abnormal (use wiring diagrams to locate circuits that run near the harness).
  7. Swap/compare sensor A and B signals (live data) — if A works and B does not but wiring to PCM is good, suspect sensor B failure.
  8. If wiring, connectors and sensor check good and code persists, test or substitute known-good sensor. Replace sensor if confirmed faulty.
  9. After repairs clear codes, perform functional test and road test to verify proper operation and that code does not return.
  10. If all wiring and sensors are good but fault returns, consult manufacturer wiring diagrams and consider module diagnosis/repair.

Likely causes

  • Broken or pinched wire between pedal sensor and PCM
  • Corroded connector at the pedal sensor or module connector
  • Sensor B internal failure (open element)
  • Shorted signal wire to ground or 12V from nearby damaged wiring
  • Poor ground at pedal bracket or chassis ground point

Fault status

⚠️ Status
Brake Pedal Position Sensor B Circuit/Open — open or abnormal signal in sensor B circuit
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P05DA P05DC P0504 P0221 P0222
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