Make: Detroit
Engine: DD15 GHG17 (2017 & Newer)
PID: N/A
SPN: 3056
FMI: 2

Description: Selective Catalyst Reduction Inlet NOx Sensor – Error
Troubleshooting:
DESCRIPTION:
Selective catalyst reduction (SCR) inlet NOx sensor – error.
MONITORED PARAMETER:
SCR Inlet NOx.
TYPICAL ENABLING CONDITIONS:
1000-1800 rpm, 35-100% load, steady cruise.
MONITOR SEQUENCE:
None
EXECUTION FREQUENCEY:
Continuous when enabling conditions met.
TYPCIAL DURATION:
8 minutes
DASH LAMPS:
MIL
ENGINE REACTION:
1000-1800 RPM, 35-100% load, steady cruise.
VERIFICATION:
8 minutes
POSSIBLE CAUSES:
1. Engine needs a parked regeneration.
2. Faulty SCR inlet NOx sensor.

Make: Detroit
Engine: DD15 GHG17 (2017 & Newer)
PID: N/A
SPN: 3057
FMI: 2

Description: Selective Catalyst Reduction Outlet NOx Sensor – Error
Troubleshooting:
DESCRIPTION:
Selective catalyst reduction (SCR) outlet NOx sensor – error.
MONITORED PARAMETER:
SCR Outlet NOx.
TYPICAL ENABLING CONDITIONS:
100-1800 rpm, 35-100% load, steady cruise.
MONITOR SEQUENCE:
None
EXECUTION FREQUENCEY:
Continuous when enabling conditions met.
TYPCIAL DURATION:
8 minutes
DASH LAMPS:
MIL
VERIFICATION:
1000-1800 rpm, 35-100% load, steady cruise, 8 minutes.
POSSIBLE CAUSES:
1. Engine needs a parked regeneration.
2. Faulty SCR inlet NOx sensor.

Make: Detroit
Engine: DD15 GHG17 (2017 & Newer)
PID: N/A
SPN: 3058
FMI: 9

Description: Exhaust Gas Recirculation Slow Response – Low Box
Troubleshooting:
DESCRIPTION:
This fault code sets when actual EGR flow vs. desired EGR flow is greater than a calibrated
threshold while the engine rpm is between 600 and 900 rpm.
MONITORED PARAMETER:
EGR delta P sensor, Intake Manifold Pressure sensor, Intake Manifold temperature sensor.
TYPICAL ENABLING CONDITIONS:
Low engine to high engine load.
MONITOR SEQUENCE:
One second after acceleration load, actual EGR flow vs. desired EGR flow is greater than a
calibrated threshold.
EXECUTION FREQUENCEY:
Always enabled
TYPCIAL DURATION:
Five seconds
DASH LAMPS:
1. MIL
2. CEL
ENGINE REACTION:
None
VERIFICATION:
Road test with a trailer while performing multiple accelerations, engine load needs to increase
above 50% during acceleration and the engine rpm is between 600 and 900 rpm.
POSSIBLE CAUSES:
1. Engine needs a parked regeneration.
2. Faulty wiring.
3. Bent pins.
4. Damaged pins.
5. Corroded pins.
6. Faulty EGR delta P electrical connector.
7. Faulty delta P sensor.
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Diagnostic Trouble Code Solutions 07/06/2023 16:09:32
8. Faulty EGR delta P sensor.
9. EGR/exhaust leaks.
10. Leaks between the turbocharger outlet pipe and the
intake manifold.
11. Leaks in Charge Air Cooler.
12. Faulty CAC.
13. EGR venturi ports needs cleaning.
14. EGR system needs cleaning.

Make: Detroit
Engine: DD15 GHG17 (2017 & Newer)
PID: N/A
SPN: 3058
FMI: 10

Description: Exhaust Gas Recirculation Slow Response
Troubleshooting:
DESCRIPTION:
This fault code sets when actual EGR flow vs. desired EGR flow is greater than a calibrated
threshold.
MONITORED PARAMETER:
EGR delta P sensor, Intake Manifold Pressure sensor, Intake Manifold Temperature sensor.
TYPICAL ENABLING CONDITIONS:
Low engine to high engine load.
MONITOR SEQUENCE:
1. One second after acceleration load.
2. Actual EGR flow vs. desired EGR flow is greater than a calibrated threshold.
EXECUTION FREQUENCEY:
Always enabled
TYPCIAL DURATION:
Five seconds
DASH LAMPS:
1. MIL
2. CEL
ENGINE REACTION:
None
VERIFICATION:
Road test with a trailer while performing multiple accelerations, engine load needs to increase
above 50% during acceleration.
POSSIBLE CAUSES:
1. Parked regeneration needed.
2. Faulty wiring.
3. Bent pins.
4. Damaged pins.
5. Corroded pins.
6. Faulty EGR delta P electrical connector.
7. Faulty delta P sensor.
Page 1
Diagnostic Trouble Code Solutions 07/06/2023 16:09:47
8. EGR venturi ports need cleaning.
9. Leaks in the EGR and exhaust system.
10. Leaks between the turbocharger outlet pipe and the intake manifold.
11. Leaks in the Charge Air Cooler.
12. Faulty CAC.
13. Faulty EGR delta P sensor.
14. EGR system needs cleaning.

Make: Detroit
Engine: DD15 GHG17 (2017 & Newer)
PID: N/A
SPN: 3061
FMI: 1

Description: Cold Start Emission Reduction Strategy Fault Condition for Boi Main
Troubleshooting:
DESCRIPTION:
This fault code sets when the point of injection does not match a modeled threshold when the
engine is cold.
MONITORED PARAMETER:
Injector timing
TYPICAL ENABLING CONDITIONS:
1. 600 rpm/base idle.
2. Coolant temperature less than 87°C (188°F).
MONITOR SEQUENCE:
None
EXECUTION FREQUENCEY:
Always
TYPCIAL DURATION:
10 Seconds
DASH LAMPS:
None
ENGINE REACTION:
None
VERIFICATION:
Run the engine at 600 rpm or base idle for five minutes with the coolant temperature below
87°C (188°F).
POSSIBLE CAUSES:
Point of injection does not match a modeled threshold when the engine is cold.

Make: Detroit
Engine: DD15 GHG17 (2017 & Newer)
PID: N/A
SPN: 3061
FMI: 2

Description: Cold Start Emission Reduction Strategy Fault Condition EGR Position
Troubleshooting:
DESCRIPTION:
This fault code sets when the point of injection does not match a modeled threshold when the
engine is cold.
MONITORED PARAMETER:
EGR position
TYPICAL ENABLING CONDITIONS:
1. 600 rpm/base idle.
2. Coolant temperature less than 87°C (188°F).
MONITOR SEQUENCE:
None
EXECUTION FREQUENCEY:
Always
TYPCIAL DURATION:
10 seconds
DASH LAMPS:
None
ENGINE REACTION:
None
VERIFICATION:
Run the engine at 600 rpm or base idle for five minutes with the coolant temperature below 87°
C (188°F).
POSSIBLE CAUSES:
Point of injection does not match a modeled threshold when the engine is cold.