Turbo Boost Control Position Sensor Circuit Intermittent/Erratic
The P2590 code indicates that the Powertrain Control Module (PCM) has detected an intermittent or erratic signal from the turbocharger boost control position sensor. This sensor monitors the position of the turbocharger wastegate or variable geometry turbo (VGT) actuator. An erratic signal can cause the PCM to incorrectly adjust boost pressure, leading to performance issues. Common causes include a faulty sensor, damaged wiring, poor electrical connections, or a malfunctioning actuator.
01. Most Common Causes
- Faulty turbocharger boost control position sensor
- Damaged or corroded wiring/connectors in the sensor circuit
- Intermittent short or open in the sensor circuit
- Malfunctioning turbocharger actuator or wastegate
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or acceleration
- Turbocharger boost pressure fluctuating or too high/low
- 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 and resistance with a multimeter according to manufacturer specifications.
Step 4: Check the actuator and wastegate for mechanical binding or sticking.
Step 5: If no issues found, clear the code and test drive to see if it returns.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances with this code, as it can cause reduced engine performance and potential damage to the turbocharger or engine. Limp mode may activate, limiting speed and power.
How much does it cost to fix?▼
The cost to diagnose and repair P2590 typically ranges from $50 to $150 for diagnosis, plus parts and labor. Sensor replacement can cost $100-$300, while wiring repairs may be less.