Cummins fault code 778 is the Cummins ISX11.9 CM2250 diagnostic trouble code for Engine Camshaft Speed / Position Sensor – Data Erratic, Intermittent, or Incorrect. This 19-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 723, FMI 2 with amber warning lamp, and the failure typically points to a lost or erratic camshaft speed and position signal, with the engine running on the primary crankshaft sensor.
Cummins fault code 778 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 S64 · SPN 723 · FMI 2 · Lamp Amber |
| Associated procedures | Cummins Procedures 019-031, 019-043 and 019-363 |
| Revision | Last modified 20-Jan-2011 |
| Pages | 19 |
| File size | 0.3 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 camshaft speed position sensor 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 Cummins fault code 778 manual
Heavy-duty truck technicians and workshop owners diagnosing a lost or erratic camshaft speed and position signal, with the engine running on the primary crankshaft sensor 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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