Make: Detroit
Engine: DD8 GHG17 (2017 & Newer)
PID: N/A
SPN: 3216
FMI: 10
Description: Selective Catalyst Reduction Inlet NOx Sensor Signal – Erratic
Troubleshooting:
DESCRIPTION:
High NOx at idle
MONITORED PARAMETER:
NOx
TYPICAL ENABLING CONDITIONS:
1. Vehicle Speed zero
2. Rpm less than 900
3. EGR closed
MONITOR SEQUENCE:
None
EXECUTION FREQUENCY:
Continuous when enabling conditions met
TYPICAL DURATION:
Two seconds
DASH LAMPS:
MIL
ENGINE REACTION:
None
POSSIBLE CAUSES:
If EGR System faults are present, troubleshoot them first.
1. Leaking or damaged Air Inlet, Charge Air Cooler (CAC), and EGR Piping and Hose
2. Leaking or damaged Exhaust
3. Faulty Inlet NOx Sensor
Make: Detroit
Engine: DD8 GHG17 (2017 & Newer)
PID: N/A
SPN: 3216
FMI: 13
Description: Selective Catalyst Reduction Inlet NOx Sensor Signal Not Available
Troubleshooting:
DESCRIPTION:
Selective Catalyst Reduction (SCR) Inlet NOx Sensor signal not available
MONITORED PARAMETER:
SCR Inlet NOx Sensor signal
TYPICAL ENABLING CONDITIONS:
Always enabled
MONITOR SEQUENCE:
None
EXECUTION FREQUENCY:
Always enabled
TYPICAL DURATION:
Two seconds
DASH LAMPS:
MIL, CEL
ENGINE REACTION:
None
VERIFICATION:
Engine Idle (one minute)
POSSIBLE CAUSES:
1. Bent, spread or corroded pins on SCR Inlet NOx Sensor harness
2. Faulty wiring between harness side of SCR Inlet NOx Sensor connector and Aftertreatment
Control Module (ACM) 120-pin connector
3. Faulty SCR Inlet NOx Sensor
4. Damage, bent, spread, corroded or unseated (pushed out) pins, signs of moisture in the
connector or wire damage near the connector on ACM 120-pin harness connector
5. Short between harness side of SCR Inlet NOx Sensor connector and ACM 120-pin
connector
6. Faulty ACM
Make: Detroit
Engine: DD8 GHG17 (2017 & Newer)
PID: N/A
SPN: 3216
FMI: 21
Description: NOx Raw Sensor Diagnosis Oxygen Pump Capacity Low
Troubleshooting:
DESCRIPTION:
Rationality check of Engine Out NOx Sensor reading. Intrusive test was 50% less than
expected learn value.
MONITORED PARAMETER:
Inlet NOx Sensor reading
TYPICAL ENABLING CONDITIONS:
Key ON, Engine OFF
MONITOR SEQUENCE:
None
EXECUTION FREQUENCY:
Always enabled
TYPICAL DURATION:
Five seconds
DASH LAMPS:
MIL
ENGINE REACTION:
None
VERIFICATION:
Ignition Cycle (Key ON, Engine OFF)
POSSIBLE CAUSES:
If Inlet NOx Sensor communication or Voltage faults are present, troubleshoot them first.
1. Damaged, bent, spread, corroded, or unseated (pushed out) pins, signs of moisture in the
connector or wire damage near the connector on NOx Sensor and harness connector
2. Faulty Inlet NOx Sensor