Cummins fault code 1659 is the official Cummins troubleshooting manual for the Engine Misfire Cylinder 6 fault on ISX11.9 CM2250 engines. This 7-page PDF documents SPN 1328, FMI 11, and the amber-lamp response, and it walks through the circuit description, the guided diagnostic steps, and the exact conditions for setting and clearing the code. An algorithm in the ECM calibration monitors engine speed as each injector fires at idle. When cylinder 6 contributes too much or too little to engine speed, this fault becomes active to aid misfire and low-power troubleshooting.
Official document details
| Brand | Cummins |
| Model coverage | ISX11.9 CM2250 and ISX12 CM2250 (2010–2012) |
| System / Group | Diagnostic Trouble Codes (DTCs) — Engine Misfire Cylinder 6 |
| Fault code | 1659 (SPN 1328, FMI 11) |
| Fault description | Engine Misfire Cylinder 6 — Root Cause Not Known – Condition Exists |
| Warning lamp | Amber |
| Reference | Cummins INSITE service tool; Procedure 019-032 (ECM Calibration Code) |
| Pages | 7 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Cummins fault code 1659 table of contents
- Overview and circuit description
- Component location
- Conditions for running the diagnostics
- Conditions for setting fault code 1659
- Action taken when the fault code is active
- Conditions for clearing the fault code
- Shop Talk service notes
- Guided troubleshooting steps and associated procedures
Applicable truck models and engines
This document applies to Cummins ISX11.9 CM2250 and ISX12 CM2250 engines from the 2010–2012 range fitted in heavy-duty on-highway trucks. The SPN 1328 / FMI 11 definition and the guided steps follow the same fault-code logic Cummins publishes for its CM2250 platform, so always confirm the ECM calibration on the vehicle against the current revision using the Cummins INSITE electronic service tool. Verify engine coverage on the Cummins official website before ordering parts.
Who needs this Cummins fault code 1659 manual
Any technician or workshop owner diagnosing Cummins fault code 1659 on an ISX11.9 CM2250 engine needs this procedure to work through the fault correctly. The manual uses this fault as a pointer toward a weak injector, compression, or fuel-delivery problem on the named cylinder rather than a standalone repair. The manual ends with the associated-procedures table and the “Reset All Faults” clearing steps so the repair can be validated.
The full PDF is available in the DiagTechPro manuals library; a free account is required to download it.
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