The fault code 427 DTCs troubleshooting manual is the official Cummins diagnostic procedure for the SAE J1939 data link on the ISX11.9 CM2250 engine platform. Devices such as ABS controllers, transmissions, displays, service tools and vehicle control units communicate with the ECM over the SAE J1939 data link, and this fault reports an abnormal update rate on that bus. This 8-page PDF walks a technician from symptom to verified repair.
Official document details
| Brand | Cummins |
|---|---|
| Model coverage | Cummins ISX11.9 CM2250 (2010-12), Cummins ISX12 CM2250 (2010-12) |
| System / Group | SAE J1939 data link, DTCs |
| Fault code reference | Fault Code 427 — SPN 639, FMI 9 |
| Warning lamp | no warning lamp |
| Revision (Last Modified) | 11-Jun-2010 |
| Pages | 8 |
| File size | 0.18 MB |
| Format | |
| Language | English |
fault code 427 DTCs document contents
- Overview and Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- Conditions for Setting the Fault Code
- Action Taken When the Fault Code Is Active
- Conditions for Clearing the Fault Code
- Shop Talk and possible causes
- Associated Procedures table
- Guided troubleshooting steps
- Verify the repair
Applicable truck models covered
This procedure applies to Cummins engines that report Fault Code 427 (SPN 639, FMI 9), including the Cummins ISX11.9 CM2250 (2010-12), Cummins ISX12 CM2250 (2010-12). Always confirm the exact calibration and publication for your engine on the official Cummins engine support site before ordering parts.
Common causes and symptoms
When J1939 messages arrive at an abnormal update rate the ECM may lose data from other modules, though no warning lamp is commanded for this specific fault. Shop Talk in the document lists the most likely causes:
- Grounded, shorted or open SAE J1939 data link wiring
- A device flooding the bus with too many consecutive messages
- A malfunctioning external OEM controlling device
Who needs the fault code 427 DTCs manual
Diesel technicians and workshop owners diagnosing Fault Code 427 on ISX11.9 CM2250 trucks need this manual to follow the guided steps, use the correct connector pins and verify the repair with INSITE electronic service tool instead of guessing.
The full PDF is available in the DiagTechPro manuals library; a free account is required to download.
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