Cummins X15 CM2350 X116B Performance Series (2018 & Newer) Fault Code: 6771 PID: SPN: 521032 FMI: 14/14 Aftertreatment System Assembly – Special Instructions

Lamp:
Red

Reason:
Aftertreatment system assembly-special Instructions. The incorrect aftertreatment diesel particulate filter system has been installed with the engine.

Effect:
None on performance.

Circuit Description:
Because engines and aftertreatment components are manufactured in different locations, they are shipped to OEM customers for final vehicle assembly. The process involves both hardware and software elements in detecting the correct match of aftertreatment system to engine model during initial engine to machine integration.

Component Location:
The aftertreatment temperature sensor module is mounted on the aftertreatment diesel particulate filter.

Conditions for Running the Diagnostics:
This diagnostic runs at key ON in the first 50 hours of engine run time.

Conditions for Setting the Fault Code:
The Engine Control Module (ECM) detected the engine has been manufactured with the incorrect aftertreatment system.

Action Taken When the Fault Code is Active:
The ECM illuminates the red stop engine lamp immediately after the diagnostic runs and fails.

Conditions for Clearing the Fault Code:
1. To validate the repair, perform a key cycle, and leave the key in the ON position for 2 minutes.
2. The fault code status displayed by the recommended diagnostic tool or equivalent will change to inactive immediately after the diagnostic runs and passes.
3. The ECM will turn off the red stop engine lamp immediately after the diagnostic runs and passes.
4. The “reset all faults” command in the recommended diagnostic tool or equivalent can be used to clear active and inactive faults, as well as extinguish the MIL for OBD applications.

Shop Talk:
The purpose of this fault code is to indicate when the wrong aftertreatment system has been mated to the engine during the equipment assembly process. If this fault code is active, the aftertreatment part numbers should be verified.