Turbo Boost Sensor Circuit Low
The P2564 code indicates that the Engine Control Module (ECM) has detected a low voltage signal from the turbocharger boost control position sensor circuit. This sensor monitors the position of the turbocharger wastegate or variable geometry turbo actuator. A low voltage reading suggests a short to ground, open circuit, or a faulty sensor, which can lead to improper boost control and reduced engine performance.
01. Most Common Causes
- Faulty turbocharger boost control position sensor
- Short to ground in the sensor circuit wiring
- Open circuit in the sensor signal wire
- Corroded or damaged connector at the sensor
- Failed ECM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power and acceleration
- Turbocharger not boosting properly
- Possible limp mode activation
- Poor fuel economy
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for additional codes.
Step 2: Visually inspect the boost control position sensor and its wiring for damage, corrosion, or loose connections.
Step 3: Test the sensor's voltage reference and ground at the connector using a multimeter (typically 5V reference, good ground).
Step 4: Measure the sensor signal voltage while manually actuating the turbo actuator (should vary smoothly).
Step 5: If signal voltage is stuck low, disconnect the sensor and check for short to ground in the wiring harness.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as the vehicle may enter limp mode, reducing power and potentially causing further turbocharger damage.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for a DIY sensor replacement, or $150 to $300 if professionally diagnosed and repaired.