P05DE

Code

Generic P — Powertrain

Brake Pedal Position Sensor B Circuit High

Brand: Generic

Type: P — Powertrain

Views: UK: 21 EN: 39 RU: 35

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Open or shorted wiring in Brake Pedal Position (BPP) sensor B circuit
Corroded, loose, or damaged connector at sensor or ECU
Faulty Brake Pedal Position sensor (B)
Short to vehicle battery/ignition 5V reference or pull‑up within ECU
Poor ground or PCB/ECU internal fault

Symptoms

Malfunction Indicator Lamp (MIL) or warning lamp illuminated
Cruise control, shift interlock or regenerative braking inhibited or degraded
Brake pedal position readings inconsistent or pegged high in live data
Brake-related warning messages, reduced engine torque or limp modes on some vehicles
Possible inability to disable cruise or problems with starting interlock systems

What to check

Connect a fully‑capable OBD-II scan tool and read freeze frame/live data for Brake Pedal Position sensor A and B
Visually inspect sensor connector, wiring harness and ECU plug for corrosion, damage, or water intrusion
Check for other codes (power/ground/reference circuits) that might be related
With connector disconnected, inspect pins for corrosion, pushed pins or melted plastic
Perform wiggle test on harness while monitoring live data for intermittent faults

Signal parameters

Typical BPP sensor output: approx. 0.5–4.5 V (vehicle-dependent). ‘High’ fault often seen when signal > ~4.5 V or pegged near supply voltage
Reference voltage to sensor: ~5 V (check manufacturer spec)
Sensor ground: near 0.0 V (low resistance to chassis ground)
Expected behaviour: sensor voltage should change smoothly with pedal travel; B and A channels should track each other proportionally

Diagnostic algorithm

Verify the code(s) and review freeze frame / live data. Note conditions when fault set (key on, driving, pedal position).
Compare BPP sensor A vs B live voltages at different pedal positions. If A is normal and B is high, fault is local to B circuit.
Visually inspect wiring, connector and harness for damage, corrosion, pin damage, or signs of shorting. Repair any damage found.
With key ON (engine off) backprobe sensor connector: verify reference voltage (~5 V) at reference pin, ground continuity at ground pin, and measure signal pin voltage. Record values at rest and while moving pedal.
If signal is high with connector disconnected, check for short to battery/ignition feed in wiring harness. If signal only high when connected to sensor, replace the sensor.
Check continuity/resistance between sensor ground and chassis ground, and between signal pin and PCM input. Repair open or high resistance paths.
If wiring and sensor check good, test or inspect PCM input for proper operation. Replace PCM only after ruling out wiring and sensor failures.
After repairs, clear codes and perform functional test and road test to confirm the fault does not return.

Likely causes

Connector corrosion or bent pins at BPP sensor or ECU
Broken wire or intermittent open in sensor signal return causing the input to float high
Sensor internal failure (stuck high output)
Short to 5V reference or external power source
Failed PCM/ECU input circuit (less common)

Fault status

⚠️ Status

Brake Pedal Position Sensor B Circuit High — stored when the pedal position sensor B voltage exceeds the allowed threshold or reports an out‑of‑range/high signal to the PCM.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours