fault code 784 DTCs is the Cummins ISX11.9 CM2250 diagnostic trouble code for Adaptive Cruise Control Mode – Data Erratic, Intermittent, or Incorrect. This 9-page troubleshooting PDF is taken from the Cummins ISX11.9 CM2250 (2010-12) service documentation and explains the circuit, the conditions that set the fault, and the guided steps used to confirm the repair. It is logged as SPN 1590, FMI 2/2 with no dashboard warning lamp, and the failure typically points to lost communication with the adaptive cruise control unit over the J1939 data link.
fault code 784 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | Cummins ISX11.9, ISB6.7, ISC8.3, ISL9 and ISX15 CM2250 |
| System / group | ISX11.9 CM2250 (2010-12) / DTCs |
| Fault code identifiers | PID S145 · SPN 1590 · FMI 2/2 · Lamp None |
| Associated procedures | Cummins Procedures 019-361, 019-071 and 019-032 |
| Revision | Last modified 18-Jan-2011 |
| Pages | 9 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview and circuit description
- Fault code reason, effect and identifiers
- Conditions for running and setting the diagnostic
- Action taken when the fault code is active
- Conditions for clearing the fault code
- Shop Talk and possible causes
- Associated procedures and guided troubleshooting steps
Applicable truck models
This diagnostic trouble code applies to Cummins ISX11.9, ISB6.7, ISC8.3, ISL9 and ISX15 CM2250 engines built in the 2010-12 CM2250 range and covers the adaptive cruise control circuit. Component locations vary by original equipment manufacturer, so the wiring and connector views in the manual should be read alongside the vehicle build. For calibration histories, INSITE service-tool resources and the latest revision of this Cummins troubleshooting procedure, see the Cummins engine support website.
Who needs this fault code 784 DTCs manual
Heavy-duty truck technicians and workshop owners diagnosing lost communication with the adaptive cruise control unit over the J1939 data link on ISX11.9 CM2250 engines rely on this reference. It ties the INSITE reading to the correct Cummins repair procedures so the fault can be confirmed and cleared without guesswork. Reviewing the guided steps before connecting a scan tool shortens diagnosis time and helps technicians avoid replacing parts that are still good.
The full PDF is available in the DiagTechPro manuals library, where a free account is required to download it.
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