The fault code 386 DTCs troubleshooting manual is the official Cummins diagnostic procedure for the sensor supply 1 circuit on the ISX11.9 CM2250 engine platform. Sensor supply 1 of the ECM provides the shared 5-volt supply for the EGR differential pressure sensor, exhaust gas pressure sensor and other engine sensors. 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 | sensor supply 1 circuit, DTCs |
| Fault code reference | Fault Code 386 — SPN 3509, FMI 3 |
| Warning lamp | an amber warning lamp |
| Revision (Last Modified) | 11-Jun-2010 |
| Pages | 8 |
| File size | 0.20 MB |
| Format | |
| Language | English |
fault code 386 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 386 (SPN 3509, FMI 3), 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
This fault is set when the sensor supply 1 voltage is above normal or shorted to a high source, which can disturb every sensor on that supply. Shop Talk in the document lists the most likely causes:
- Sensor supply circuit shorted to a higher voltage source
- A short between the supply and battery voltage in the harness
Who needs the fault code 386 DTCs manual
Diesel technicians and workshop owners diagnosing Fault Code 386 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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