OBD Guide
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P05DB

Brake Pedal Position Sensor B Circuit/Open

P05DB is an OBD-II diagnostic trouble code meaning: Brake Pedal Position Sensor B Circuit/Open. Common causes: broken wire in the brake pedal position sensor b circuit, damage to the sensor connector (corrosion, broken retainer, dropped contact). Estimated repair cost: $33–133.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$33–133 (est.)

Symptoms

  • Check Engine Light and/or ABS/ESP Warning Illuminated
  • Disabling adaptive cruise control
  • Engine start blocking (in some cars, starting is impossible without a signal from the brake sensor)
  • Disabling or incorrect operation of the regenerative braking system
  • Delayed response when pressing the brake pedal in systems with brake-by-wire

Causes

  • Broken wire in the brake pedal position sensor B circuit
  • Damage to the sensor connector (corrosion, broken retainer, dropped contact)
  • Malfunction of the sensor itself (internal break)
  • Moisture ingress into the pedal unit area and corrosion of the contacts
  • Mechanical damage to the wiring harness during pedal assembly repair

How to Fix

  1. Read fault codes; check related ABS, ESP, cruise control codes
  2. Inspect the brake pedal position sensor B and its connector under the pedal unit - the presence of moisture, corrosion, mechanical damage
  3. Check the presence of power and ground at sensor connector B with the ignition on
  4. Measure the resistance of sensor B or check its signal when pressing the pedal
  5. Check the signal wire from the sensor connector to the ECU for a break
  6. Replace brake pedal position sensor B or repair wiring

Related codes

P05DCP05DDP05DEP05DFP05E0P0571P0572

Error P05DB by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P05DB code mean?

P05DB is an OBD-II diagnostic trouble code that indicates: Brake Pedal Position Sensor B Circuit/Open

What causes a P05DB error code?

The most common causes of P05DB include: Broken wire in the brake pedal position sensor B circuit; Damage to the sensor connector (corrosion, broken retainer, dropped contact); Malfunction of the sensor itself (internal break); Moisture ingress into the pedal unit area and corrosion of the contacts.

How do I fix a P05DB diagnostic trouble code?

To fix P05DB: Read fault codes; check related ABS, ESP, cruise control codes. Inspect the brake pedal position sensor B and its connector under the pedal unit - the presence of moisture, corrosion, mechanical damage. Check the presence of power and ground at sensor connector B with the ignition on. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P05DB?

Do not drive — repair immediately

How much does it cost to fix P05DB?

The estimated repair cost for P05DB is $33–133. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat