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P003A

Turbocharger/Supercharger Boost Control A Position Exceeded Learning Limit

Turbocharger/Supercharger Boost Control A Position Exceeded Learning Limit: the control module has detected this fault condition. This affects turbo/supercharger boost-pressure control.

  • Check engine light: Yes
  • Emissions related: Yes
  • Repair difficulty: hard

Symptoms

  • Charge status indicator shows fault
  • Charging may not start or interrupts
  • Slower-than-expected charge rate

Common causes

Ordered by how often each turns out to be the cause.

  • Wastegate actuator worn or stickingCommon
  • Linkage rod stretched or loosePossible

Parts involved

  • Wastegate Actuator
  • Turbocharger
  • Position Sensor

P003A is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.