SPN 641 / FMI 7
VGT Turbocharger Actuator — Not Responding
SAE J1939
turbo
SPN 641
FMI 7
What it means
Variable-geometry turbo actuator not responding to commands — sticking vanes or actuator.
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Run a free diagnosisRelated codes
SPN 102 / FMI 2
Intake Manifold (Boost) Pressure — Data Erratic
turboMedium
P0234
Turbocharger Overboost Condition
turboHigh
P0299
Turbocharger Underboost Condition
turboHigh
P2262
Turbo Boost Pressure Not Detected — Mechanical
turboHigh
General reference only — always confirm against the OEM procedure for your specific engine.