Turbocharger Boost Control Position Sensor "B" Circuit Intermittent/Erratic
P2590 indicates an intermittent electrical fault in the Turbo Boost Control Position Sensor B circuit. This sensor monitors the boost control solenoid position, and an intermittent signal disruption prevents the engine computer from accurately controlling turbo boost pressure.
What You Might Notice
- Check engine light (MIL) illuminated
- Poor engine performance and power loss
- Hesitation or sluggish acceleration
- Decreased fuel economy
- Possible turbo boost pressure fluctuations
Most Common Causes
- 1
Open or loose connection in sensor circuit
A break or intermittent open in the wiring harness or connector terminals leading to the boost control position sensor causes signal dropout.
- 2
Short to voltage in signal wire
The sensor signal wire is shorted to a high voltage source, causing intermittent signal corruption and sensor reading errors.
- 3
Faulty Turbo Boost Control Position Sensor B
The sensor itself has internal intermittent contact issues or is failing, producing sporadic or missing voltage signals.
- 4
Short to ground in signal circuit
The sensor signal wire has intermittent contact with ground, causing the circuit to drop voltage unpredictably.
How to Diagnose It
- 1
Check Open or loose connection in sensor circuit — A break or intermittent open in the wiring harness or connector terminals leading to the boost control position sensor causes signal dropout.
- 2
Check Short to voltage in signal wire — The sensor signal wire is shorted to a high voltage source, causing intermittent signal corruption and sensor reading errors.
- 3
Check Faulty Turbo Boost Control Position Sensor B — The sensor itself has internal intermittent contact issues or is failing, producing sporadic or missing voltage signals.
- 4
Check Short to ground in signal circuit — The sensor signal wire has intermittent contact with ground, causing the circuit to drop voltage unpredictably.
How to Fix It
- 1
Inspect and repair sensor wiring harness
Locate the boost control position sensor B circuit and inspect all wiring for damage, corrosion, fraying, or loose connections. Repair or replace damaged sections and ensure all connector pins are fully seated.
- 2
Test and clean sensor connectors
Disconnect the boost control position sensor connector and inspect for corrosion, moisture, or bent pins. Clean with electrical contact cleaner and reconnect firmly, ensuring no water intrusion.
- 3
Replace Turbo Boost Control Position Sensor B
If wiring and connections are intact, the sensor itself is likely failing intermittently. Remove and replace the boost control position sensor with a new OEM or quality aftermarket unit.
- 4
Clear code and perform test drive
After repairs, use a diagnostic scanner to clear the DTC and monitor for reoccurrence during a test drive under various throttle conditions to confirm the fix.
Need a deeper diagnosis?
Search for related repair guides or browse by system.