Detroit DD15 GHG14 (2014-16) Fault Code: SPN 615 FMI 5 (MCM) Axial Power Turbine Air Seal Pressure Regulator Valve Circuit Failed Open

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

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