Turbocharger Speed Sensor Circuit Range/Performance
The P2579 code indicates that the Engine Control Module (ECM) has detected a signal from the turbocharger speed sensor that is outside the expected range or performance parameters. This sensor monitors the rotational speed of the turbocharger shaft to prevent over-speed and ensure proper boost control. A faulty sensor, wiring issues, or mechanical problems with the turbocharger can trigger this code.
01. Most Common Causes
- Faulty turbocharger speed sensor
- Damaged or corroded wiring/connectors to the sensor
- Turbocharger mechanical failure (e.g., worn bearings, shaft play)
- ECM software issues or calibration errors
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or limp mode
- Poor acceleration or turbo lag
- Unusual turbocharger noises (whining, screeching)
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 turbo speed sensor and its wiring for damage, corrosion, or loose connections.
Step 3: Test the sensor's resistance and signal output with a multimeter per manufacturer specifications.
Step 4: Check turbocharger for excessive shaft play or mechanical binding.
Step 5: If sensor and wiring are okay, update ECM software or replace the sensor.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. Driving with a faulty turbo speed sensor can lead to turbocharger over-speed, causing catastrophic failure and expensive repairs. The vehicle may enter limp mode to protect the engine.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for a new sensor, plus labor if installed by a shop. However, if the turbocharger itself is damaged, costs can exceed $1,000.