OBD Guide
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P003B

Turbocharger/Supercharger Boost Control B Position Exceeded Learning Limit

P003B is an OBD-II diagnostic trouble code meaning: Turbocharger/Supercharger Boost Control B Position Exceeded Learning Limit. Common causes: boost regulator malfunction, problems in the control wiring harness. Estimated repair cost: $56–333.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–333 (est.)

Symptoms

  • Reduced engine power
  • Unstable engine operation
  • Switching to emergency mode
  • Increased fuel consumption
  • Check engine light comes on

Causes

  • Boost regulator malfunction
  • Problems in the control wiring harness
  • Jamming of the mechanism for changing the turbine geometry
  • Boost control solenoid valve malfunction
  • Mechanical wear of turbocharger/supercharger components

How to Fix

  1. Check the condition of the boost control system wiring harness and connectors
  2. Check the operation of the boost control solenoid valve
  3. Check the mechanism for changing the turbine geometry for jamming and wear.
  4. Perform the boost control system adaptation procedure
  5. If necessary, replace the boost regulator or turbocharger
  6. Clear error codes and check system operation

Related codes

P003AP003CP0045P0234P0299

Error P003B by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P003B code mean?

P003B is an OBD-II diagnostic trouble code that indicates: Turbocharger/Supercharger Boost Control B Position Exceeded Learning Limit

What causes a P003B error code?

The most common causes of P003B include: Boost regulator malfunction; Problems in the control wiring harness; Jamming of the mechanism for changing the turbine geometry; Boost control solenoid valve malfunction.

How do I fix a P003B diagnostic trouble code?

To fix P003B: Check the condition of the boost control system wiring harness and connectors. Check the operation of the boost control solenoid valve. Check the mechanism for changing the turbine geometry for jamming and wear.. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P003B?

Limited driving only, diagnose soon

How much does it cost to fix P003B?

The estimated repair cost for P003B is $56–333. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat