Cummins Fault Code
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Severe Derate / VGT Frozen
System
Turbo
Symptom
Severe Derate / VGT Frozen
Diagnosis & fix steps
LOGIC: VGT Actuator Software Incompatibility.
ACTION: Perform an "Actuator Installation" calibration in Insite. Update ECM firmware to the April 2026 revision.
Red Seal field insights
X15 Spec: Common after replacing a turbo. The software "handshake" fails if versions don't match.
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