Cummins Fault Code
Free · no signupP00AF
Severe Derate
System
Turbo
Symptom
Severe Derate
Diagnosis & fix steps
LOGIC: VGT Actuator Position Error.
ACTION: Check for a stuck VGT linkage or failed electronic actuator.
Red Seal field insights
Logic: The ECM cannot move the turbo vanes to the commanded position. Common on ISX/X15.
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