Home › Codes › SPN 641 › FMI 13

SPN 641 FMI 13

VGT Actuator — Out of calibration.
The component or the controller's calibration for it is not within the expected range.

What the SPN covers: The electronic actuator that moves the vanes in a variable-geometry turbocharger. More on SPN 641.

What FMI 13 usually points to: A replaced part that needs a calibration or learn procedure, wrong software, or a worn component. More on FMI 13.

Severity

MEDIUM — fix soon

Expect low power and possibly a derate. Drivable carefully.

Likely causes

  1. Sticking VGT vanes (soot/carbon)
  2. Failed actuator motor or internal electronics
  3. Overheated actuator
  4. Wiring or power supply issue

Checks & fixes (easiest first)

  1. Run the OEM VGT sweep/calibration test
  2. Check actuator power and ground
  3. Inspect the turbo for vane sticking
  4. Check boost codes

FAQ

What does SPN 641 FMI 13 mean?

VGT Actuator — out of calibration. The component or the controller's calibration for it is not within the expected range.

Is SPN 641 FMI 13 serious?

Expect low power and possibly a derate. Drivable carefully.

What should I check first for SPN 641 FMI 13?

Run the OEM VGT sweep/calibration test; Check actuator power and ground; Inspect the turbo for vane sticking.