Make: Detroit
Engine: DD15 GHG17 (2017 & Newer)
PID: N/A
SPN: 986
FMI: 19
Description: J1939 CM1 SPN986 Signal from Source #1 or #2 is Erratic
Troubleshooting:
NOTICE: This fault does not indicate a Common Powertrain Controller (CPC) issue; do not
replace the CPC.
DESCRIPTION:
J1939 message erratic.
MONITORED PARAMETER:
J1939 CM1 message.
TYPICAL ENABLING CONDITIONS:
Always on
MONITOR SEQUENCE:
None
EXECUTION FREQUENCEY:
Continuous when enabling conditions met.
TYPCIAL DURATION:
Two seconds
DASH LAMPS:
None
ENGINE REACTION:
None
VERIFICATION:
Key cycle
POSSIBLE CAUSES:
1. Faulty Controller Area Network (CAN) line.
2. CPC needs reprogramming.
3. CPC needs proper configuration.
Make: Detroit
Engine: DD15 GHG17 (2017 & Newer)
PID: N/A
SPN: 1033
FMI: 2
Description: Aftertreatment Control Module Engine Hours Data Erratic, intermittent or Incorrect
Troubleshooting:
NOTE: The Common Powertrain Controller (CPC) digital outputs have the same SPN as some
Motor Control Module (MCM) faults. The diagnostic standard makes the distinction between
the MCM and CPC when diagnosing a fault.
POSSIBLE CAUSES:
CPC or ACM needs reprogramming.
Make: Detroit
Engine: DD15 GHG17 (2017 & Newer)
PID: N/A
SPN: 1071
FMI: 3
Description: Fan Stage 2 Circuit Failed High
Troubleshooting:
DESCRIPTION:
Fan circuit failed high.
MONITORED PARAMETER:
Fan control solenoid.
TYPICAL ENABLING CONDITIONS:
Always enabled
MONITOR SEQUENCE:
None
EXECUTION FREQUENCEY:
Always enabled
TYPCIAL DURATION:
2 seconds
DASH LAMPS:
None
ENGINE REACTION:
None
VERIFICATION:
Ignition cycle
POSSIBLE CAUSES:
1. Corroded pins.
2. Unseated pins.
3. Damaged pins.
4. Bent pins.
5. Spread pins.
6. Damaged seal.
7. Faulty fan control solenoid.
8. Faulty wiring.
Make: Detroit
Engine: DD15 GHG17 (2017 & Newer)
PID: N/A
SPN: 1071
FMI: 4
Description: Fan Stage 2 Circuit Failed Low
Troubleshooting:
DESCRIPTION:
Fan circuit failed low.
MONITORED PARAMETER:
Fan control solenoid.
TYPICAL ENABLING CONDITIONS:
Always enabled
MONITOR SEQUENCE:
None
EXECUTION FREQUENCEY:
Always enabled
TYPCIAL DURATION:
2 seconds
DASH LAMPS:
1. MIL
2. CEL
ENGINE REACTION:
None
VERIFICATION:
Ignition cycle
POSSIBLE CAUSES:
1. Corroded pins.
2. Unseated pins.
3. Damaged pins.
4. Bent pins.
5. Spread pins.
6. Damaged seal.
7. Faulty fan control solenoid.
8. Faulty wiring.
Make: Detroit
Engine: DD15 GHG17 (2017 & Newer)
PID: N/A
SPN: 1071
FMI: 5
Description: Fan Stage 2 Circuit Failed Open
Troubleshooting:
DESCRIPTION:
Fan circuit failed open.
MONITORED PARAMETER:
Fan control solenoid.
TYPICAL ENABLING CONDITIONS:
Always enabled
MONITOR SEQUENCE:
None
EXECUTION FREQUENCEY:
Always enabled
TYPCIAL DURATION:
2 seconds
DASH LAMPS:
None
ENGINE REACTION:
None
VERIFICATION:
Ignition cycle
POSSIBLE CAUSES:
1. Corroded pins.
2. Unseated pins.
3. Damaged pins.
4. Bent pins.
5. Spread pins.
6. Damaged seal.
7. Faulty fan control solenoid.
8. Faulty wiring.