Make: Detroit
Engine: DD15 GHG17 (2017 & Newer)
PID: N/A
SPN: 1624
FMI: 19

Description: Tachograph Vehicle Speed Signal is Erratic
Troubleshooting:
DESCRIPTION:
Tachograph vehicle speed signal is erratic.
MONITORED PARAMETER:
J1939 communication
TYPICAL ENABLING CONDITIONS:
Always enabled
MONITOR SEQUENCE:
None
EXECUTION FREQUENCEY:
Always enabled
TYPCIAL DURATION:
Two seconds
DASH LAMPS:
CEL
ENGINE REACTION:
None
VERIFICATION:
Key on, engine off.
POSSIBLE CAUSES:
1. Battery voltage.
2. Common Powertrain Controller (CPC) needs reprogramming.
3. CPC needs proper configuration.

Make: Detroit
Engine: DD15 GHG17 (2017 & Newer)
PID: N/A
SPN: 1636
FMI: 0

Description: Charge Air Cooler Low Efficiency
Troubleshooting:
DESCRIPTION:
This code sets when the motor control module (MCM) detects very high charge air and air
intake manifold temperatures. Charge air cooler (CAC) low efficiency.
MONITORED PARAMETER:
Intake manifold and charge air cooler outlet temperature sensors.
TYPICAL ENABLING CONDITIONS:
Coolant temperature above 65°C (149°F).
MONITOR SEQUENCE:
None
EXECUTION FREQUENCEY:
Always enabled
TYPCIAL 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 charge 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.

Make: Detroit
Engine: DD15 GHG17 (2017 & Newer)
PID: N/A
SPN: 1636
FMI: 3

Description: Intake Manifold Temperature Circuit Failed High
Troubleshooting:
DESCRIPTION:
Intake manifold temperature circuit failed high.
MONITORED PARAMETER:
Engine RPM
TYPICAL ENABLING CONDITIONS:
Always enabled
MONITOR SEQUENCE:
None
EXECUTION FREQUENCEY:
Always enabled
TYPCIAL DURATION:
2 seconds
DASH LAMPS:
1. MIL
2. CEL
ENGINE REACTION:
Derate 25%
VERIFICATION:
Engine idle (1 minute).
POSSIBLE CAUSES:
1. Damaged pins.
2. Bent pins.
3. Spread pins.
4. Broken pins.
5. Pushed out pins.
6. Corroded pins.
7. Damaged wire.
8. Faulty Intake Manifold Temperature sensor.
9. Faulty Intake Manifold Temperature harness pig tail.

Make: Detroit
Engine: DD15 GHG17 (2017 & Newer)
PID: N/A
SPN: 1636
FMI: 4

Description: Intake Manifold Temperature Circuit Failed Low
Troubleshooting:
DESCRIPTION:
Intake manifold temperature circuit failed low.
MONITORED PARAMETER:
Intake manifold temperature sensor.
TYPICAL ENABLING CONDITIONS:
Always enabled
MONITOR SEQUENCE:
None
EXECUTION FREQUENCEY:
Always enabled
TYPCIAL DURATION:
2 seconds
DASH LAMPS:
1. MIL
2. CEL
ENGINE REACTION:
Derate 25%
VERIFICATION:
Engine idle (1 minute).
POSSIBLE CAUSES:
1. Damaged pins.
2. Bent pins.
3. Spread pins.
4. Broken pins.
5. Pushed out pins.
6. Corroded pins.
7. Damaged wire.
8. Faulty Intake Manifold Temperature sensor.
9. Faulty Intake Manifold Temperature harness pig tail.

Make: Detroit
Engine: DD15 GHG17 (2017 & Newer)
PID: N/A
SPN: 1636
FMI: 10

Description: Intake Manifold Temperature – Signal Spike
Troubleshooting:
DESCRIPTION:
Intake manifold temperature rate of change too fast.
MONITORED PARAMETER:
Intake manifold temperature sensor.
TYPICAL ENABLING CONDITIONS:
Always enabled
MONITOR SEQUENCE:
None
EXECUTION FREQUENCEY:
Always enabled
TYPCIAL DURATION:
Two seconds
DASH LAMPS:
1. MIL
2. CEL
ENGINE REACTION:
Derate
VERIFICATION:
Engine idle (one minute).
POSSIBLE CAUSES:
1. Worn, damaged or corroded connectors.
2. Damaged wires.