SPN 2659 FMI 18 is the Detroit DD Series diagnostic trouble code for egr flow target error diagnostic, low flow, and this page documents the 1-page fault-code PDF for it. It gives mechanics the monitored conditions, the step-by-step troubleshooting sequence and the EGR flow checks needed to diagnose the fault. The full document is a Detroit fault code sheet built from Detroit Power Service Literature references.
Official document details
| Brand | Detroit (Detroit Diesel / DTNA) |
| Model coverage | DD13, DD15 and DD16 |
| System / Group | DD Series (EPA 2007-Current) / DTCs — EGR flow |
| Suspect Parameter Number | 2659 |
| Failure Mode Identifier | 18 |
| Fault description | EGR Flow Target Error Diagnostic, Low Flow |
| Year / Emissions | EPA10, GHG14 |
| Pages | 1 |
| File size | 0.21 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code header: SPN and FMI identification
- Description and monitored parameters
- Troubleshooting steps
- Component removal references (Detroit Power Service Literature)
- Verification and clearing the code
SPN 2659 FMI 18 diagnostic overview
This code indicates an EGR flow target error with low measured flow. The sheet documents the EGR mass-flow monitor, its enabling conditions such as closed-loop EGR control and barometric pressure above 755 mbar, and the verification procedure used to confirm the repair. Reading SPN 2659 FMI 18 correctly stops parts being replaced before the wiring and mechanical checks are done.
Applicable truck models
This Detroit DD Series fault code sheet applies to the DD13, DD15 and DD16 engines in the DD Series (EPA 2007-Current) family, covering EPA10, GHG14 configurations, and the same code also appears in Detroit Series 60 DDEC VI listings. Component removals point to Detroit Power Service Literature, and unresolved cases route to the Detroit Customer Support Center at 800-445-1980. Verify engine and emissions level against your build on the official Detroit brand site before ordering parts.
Who needs this 2659 FMI 18 manual
Heavy-duty diesel technicians, fleet workshops and owner-operators running Detroit DD engines use this EGR flow sheet with a diesel diagnostic tool to work the fault methodically instead of guessing.
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