P2564
Turbocharger Boost Control Position Sensor A Circuit Low
Position sensor A signal voltage below the lower limit — short to ground in the signal line or open reference voltage at the sensor.
- 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.
- Signal wire shorted to groundCommon
- Missing 5 V reference at the sensorPossible
- Connector pins corroded - high contact resistanceLess likely
Parts involved
- Turbo Actuator Position Sensor A
- Sensor Wiring
P2564 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.