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Detroit DD15 GHG14 (2014-16) Fault Code: SPN 615 FMI 3 (MCM) Axial Power Turbine Air Seal Pressure Regulator Valve Circuit Failed High

NOTE: Please see the step by step troubleshooting procedures for this specific code.

PROBABLE CAUSES:
1. APT air seal pressure regulator valve harness connector or wiring.
2. APT air seal pressure regulator valve.