The P2579: Turbocharger Speed Sensor Circuit Range/Performance code indicates that there is a problem with the range or performance of the turbocharger speed sensor circuit. This may result from a faulty sensor, issues with the wiring or connectors, or a malfunction that prevents the sensor from accurately reporting turbocharger speed, which is critical for proper boost management.
P2579 – Quick Overview
Code | Information |
---|---|
Meaning | P2579: Turbocharger Speed Sensor Circuit Range/Performance |
Is it serious? | Yes, as incorrect readings from the turbocharger speed sensor can lead to incorrect turbocharger control, which may cause underboost or overboost, potentially damaging the engine. |
Possible causes | – Range or performance issues with the turbocharger speed sensor circuit – Faulty turbocharger speed sensor – Wiring or connector problems |
How to diagnose? | – Test the range and performance of the turbocharger speed sensor circuit – Inspect and test the turbocharger speed sensor – Check wiring and connectors – Replace faulty components if needed |
P2579 Meaning
The P2579: Turbocharger Speed Sensor Circuit Range/Performance code means that the signal from the turbocharger speed sensor is out of the expected range or shows performance issues. The sensor is crucial for monitoring the rotational speed of the turbocharger to ensure that it operates within a safe and efficient range. Problems in this sensor can result in improper boost pressure management, affecting engine performance and potentially causing mechanical damage to the turbocharger.
Step-by-step diagnostic guide
Action | Description | Tools Needed |
---|---|---|
Check for Other Related Codes | Use an OBD-II scanner to determine if other related fault codes are present. Additional codes may provide further insights into broader issues affecting the turbo system. | OBD-II Scanner |
Test the Range and Performance of the Sensor Circuit | Use a multimeter or diagnostic tool to measure the output of the turbocharger speed sensor. Compare the values to manufacturer specifications to see if they fall within the acceptable range. Ensure the signal changes appropriately with changes in engine and turbo speed. | Multimeter, Diagnostic Tool |
Inspect the Turbocharger Speed Sensor | Visually inspect the sensor for any signs of damage, corrosion, or wear that could affect its performance. Check that the sensor is securely mounted and in good condition. | Flashlight, Safety Gloves |
Test the Turbocharger Speed Sensor | Use a diagnostic scanner to observe real-time data from the turbocharger speed sensor. Ensure the sensor provides a consistent and accurate reading corresponding to the actual speed of the turbocharger. | OBD-II Scanner, Diagnostic Tool |
Check Wiring and Connectors | Inspect all wiring and connectors leading to the turbocharger speed sensor. Look for loose connections, frayed wires, or corrosion that could cause performance issues or incorrect readings. | Flashlight, Multimeter |
Repair or Replace Faulty Wiring/Connectors | Repair any damaged wiring or replace corroded connectors to restore proper signal transmission. Ensure all connections are tight and clean to prevent signal interruptions. | Basic Tools, Replacement Parts |
Replace Faulty Turbocharger Speed Sensor | If the sensor is found to be faulty after testing, replace it. Ensure the new sensor is properly calibrated and installed for accurate monitoring of the turbocharger speed. | Replacement Turbocharger Speed Sensor |
Clear the Code and Test Drive | After completing the repairs, clear the fault code using an OBD-II scanner. Test drive the vehicle while monitoring the turbocharger speed data to ensure proper function and verify that the code does not return. | OBD-II Scanner, Vehicle Owner’s Manual |
Recheck for Codes | Re-scan the vehicle using the OBD-II scanner to confirm that the P2579 code has been resolved. If the code persists, further investigation may be required to isolate additional issues. | OBD-II Scanner |

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Hi, I am Juraj “Yuri” Lukacko. I got frustrated by unhelpful and scammy mechanics, so I decided to learn everything about car diagnostics myself. I test dozens of new car diagnostic tools every month along with learning new strategies to fix and customize cars. About Juraj Lukacko (Yuri)