This page covers the Detroit fault code SPN 5358 FMI 18, the Cylinder #1 Engine Smoothness Control / Quantity Excess diagnostic on DD Platform engines. It documents the monitored parameter, the engine reaction, and the factory troubleshooting steps for GHG14 builds.
Official document details
| Brand | Detroit |
| Model coverage | Detroit DD13, DD15, DD16 and Series 60 (DDEC VI) |
| System / Group | DD Series (EPA 2007-Current) / DTCs |
| Source | TruckFaultCodes.com |
| Year / Revision | 2017 (GHG14) |
| Pages | 3 |
| File size | 0.29 MB |
| Format | |
| Language | English |
SPN 5358 FMI 18 table of contents
- Fault code description and 25% derate
- Monitored parameter and enabling conditions
- Relative Cylinder Compression Test
- Idle Speed Balance (ISB) values
- Fuel injector and line inspection
The monitored parameter is Cylinder 1 Fueling Error under Engine Smoothness Control. Typical duration is 2 seconds, both the MIL and CEL are illuminated, and the engine reaction is a 25% derate – unlike the quantity-low version, this excess fault protects the engine by cutting power.
Entry conditions require engine speed above low idle, all cylinders active with no fault reactions, and steady speed/torque. The listed causes are cylinder kit failure, valve train failure, lash adjustments, a fuel injector, high pressure fuel line damage from rail to injector, and debris entering the injector on intermittent faults.
Applicable truck models
This guide applies to Detroit DD13, DD15 and DD16 engines built to EPA 2007 / GHG14, cross-referenced to Series 60 (DDEC VI). The compression test and ISB reading use the diesel diagnostic tool, and injector removal follows the Three-Filter System literature. Dealer and product details are at Detroit’s official website.
Who needs this SPN 5358 FMI 18 manual
Technicians facing a 25% power derate and a cylinder #1 fueling complaint on DD Series engines use this document to isolate a mechanical, injector, or high pressure line cause before repairs.
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