What Does P2579 Mean?
The turbocharger speed sensor is providing a signal that is outside the expected range or shows implausible readings. The sensor may be reading turbo speed that doesn't correlate with engine operating conditions.
Common Causes
35%
Failing turbocharger speed sensor providing erratic signal
25%
Intermittent wiring issue or poor connection causing signal dropout
20%
Excessive turbocharger shaft play or bearing wear affecting sensor reading
12%
ECM software issue or calibration error
8%
Sensor contamination from oil or debris affecting signal accuracy
Diagnostic Steps
1
Step 1: Monitor turbo speed sensor data with scan tool during operation; compare readings to boost pressure and engine load
2
Step 2: Inspect turbocharger for excessive shaft play; check radial and axial movement
3
Step 3: Check for oil leakage around turbo seals that may contaminate the speed sensor
4
Step 4: Test sensor signal voltage/frequency output while manually spinning turbo (engine off, cool); verify signal changes
5
Step 5: Check for ECM software updates or TSBs related to turbo speed sensor calibration
Estimated Repair Cost
$200 - $1,500
Parts + labor, varies by vehicle and location
The turbocharger speed sensor is providing a signal that is outside the expected range or shows implausible readings. The sensor may be reading turbo speed that doesn't correlate with engine operating conditions.
The most common cause of P2579 (Turbocharger Speed Sensor Circuit Range/Performance) is: Failing turbocharger speed sensor providing erratic signal
Typical repair costs for P2579 range from $200 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Reduced engine performance and potential limp mode activation. Undetected turbo over-speed could lead to catastrophic turbocharger failure.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2579 to identify the root cause.
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Quick Info
Category
Powertrain
System
Forced Induction System
Difficulty
Type
Generic (SAE)
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