fault code 596 DTCs is the Cummins ISX11.9 CM2250 diagnostic document for the ECM power supply and electrical charging system, logged as SPN 167, FMI 16 with a amber lamp. The amber warning lamp stays illuminated until the high battery voltage condition is corrected. The ECM receives constant unswitched battery voltage plus a switched keyswitch input; the battery voltage monitor feature sets the code when battery voltage is higher than a calibratable value. This DiagTechPro library page outlines what the official Cummins troubleshooting procedure contains before you download the full PDF.
fault code 596 DTCs document details
| Brand | Cummins |
| Model coverage | ISX11.9 CM2250 (2010-12), ISX12 CM2250 (2010-12) |
| System / Group | ECM Power Supply Circuit — DTCs |
| Fault code / SPN / FMI | 596 / SPN 167 / FMI 16 |
| PID / Lamp | P167 / Amber |
| Year / Revision | Not stated in the extract |
| Pages | 8 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Overview and Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- Conditions for Setting the Fault Codes
- Action Taken When the Fault Code Is Active
- Conditions for Clearing the Fault Code
- Shop Talk and troubleshooting steps
Applicable truck models and engines
This Cummins DTC applies to ISX11.9 CM2250 (2010-12) and ISX12 CM2250 (2010-12) engines, and the shared circuit information also references the ISB6.7, ISC8.3, ISL9 and ISX15 CM2250 platforms. Always match the electrical charging system voltage wiring against the OEM diagram before testing, and confirm the diagnosis with the Cummins INSITE electronic service tool. Full engine specifications are published on the official Cummins website.
Who needs this fault code 596 DTCs manual
Workshop technicians, fleet maintenance teams and owner-operators diagnosing a electrical charging system voltage concern on ISX11.9 or ISX12 CM2250 engines use this document to read the CM2250 diagnostic conditions, the action the ECM takes, and the exact steps to clear the code.
The complete PDF (8 pages) is available in the DiagTechPro manuals library; a free account is required to download it. This reference copy helps technicians prepare parts and test steps before servicing the engine.
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