Detroit DD15 GHG14 (2014-16) Fault Code: SPN 1636 FMI 0 (MCM) Charge Air Cooler Low Efficiency

NOTE: This code sets when the motor control module (MCM) detects very high charge air and air intake manifold temperatures.

DESCRIPTION:
Charge air cooler (CAC) low efficiency.

MONITORED PARAMETER:
Intake manifold and charge air cooler outlet temperature sensors.

TYPICAL ENABLING CONDITIONS:
Coolant temperature is above 65°C (149°F).

MONITOR SEQUENCE:
None

EXECUTION FREQUENCY:
Always enabled

TYPICAL DURATION:
10

DASH LAMPS:
1. MIL
2. CEL

ENGINE REACTION:
Derate 10%

VERIFICATION:
Road test the vehicle with coolant temperature above 65°C (149°F).

NOTE: The intake air temperature and charger air cooler temperature can increase if the vehicle is driven on steep inclines in lower gears.

POSSIBLE CAUSES:
1. Low vehicle speed with high engine load.
2. External CAC restriction.
3. Internal CAC restriction.
4. Fluid intrusion into the CAC.

PROBABLE CAUSES:
1. Low vehicle speed with high engine load (steep grade climb).
2. Fan operation.
3. Winter front in high ambient temperatures.