VGT Position Sensor Circuit Out of Range
The VGT position sensor is reporting a position outside the expected range.
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What it means (plain English)
The Variable Geometry Turbocharger (VGT) has a sensor that tells the engine computer how open or closed it is. When this sends a number that doesn't make sense, like saying the turbo is 100% closed when it’s not, there’s a problem.
What the computer is actually seeing
The engine control module (ECM) looks for a voltage signal from the VGT position sensor typically between 0.5V (full closed) and 4.5V (full open). If it sees values above 4.5V or below 0.5V, it throws SPN 3413.
What a healthy reading looks like
VGT position sensor output should be between 0.5V and 4.5V under normal operation; expected operation should reflect the position of the VGT actuator.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Check the VGT actuator for physical damage or binding. If it binds, repair or replace it.
- 22. Inspect wiring and connectors to the VGT position sensor for damage or looseness. Repair any issues found.
- 33. Measure the voltage at the VGT position sensor connector with the engine running. Should be between 0.5V and 4.5V.
- 44. If voltage is out of range, replace the VGT position sensor.
- 55. If voltage is in range, check the turbocharger actuator for proper operation.
Common causes
- VGT position sensor failure
- Damaged wiring or connections
- Failed turbocharger actuator
- Excessive exhaust back pressure
- Contaminated or low turbo oil supply
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate severity. You may experience reduced power; repairs should be made soon.
What happens if I ignore it?
Ignoring it could lead to turbo damage or loss of performance.
Why is it sometimes accompanied by low power issues?
If the VGT isn't working right, it can restrict airflow, reducing engine power.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
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