P004E
Turbocharger/Supercharger Boost Control A Circuit Intermittent/Erratic
Intermittent dropouts or noise on boost control A circuit. Loose connector, partial wiring break, or solenoid degrading.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
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.
- Connector loose or corrodedCommon
- Wiring chafed inside loomPossible
- Connector with intermittent contact under vibrationLess likely
Parts involved
- Boost Control Solenoid
- Connector
P004E 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.