SPN 4258 FMI 4 is the Detroit diesel diagnostic trouble code for the Injector Amplifier Control Valve Cylinder 4, 5, 6 Shorted to Ground on DD Series (EPA 2007-Current) engines. This 4 pages EPA10 / GHG14 PDF documents the code description, monitored parameters, dash-lamp and engine-reaction data, and the diagnostic routine drawn from Detroit Power Service Literature.
What SPN 4258 FMI 4 means
This code sets when the injector amplifier control valve for cylinders 4, 5 and 6 is shorted to ground, enabled when fis_nop_act is greater than 1.85. It lights the MIL and CEL, applies a 25% derate, and is verified at 1400 to 1500 RPM.
Official document details
| Brand | Detroit |
|---|---|
| Model coverage | DD Series (EPA 2007-Current), also cross-referenced on Series 60 (DDEC VI, EPA 2007) |
| System / group | Diagnostic trouble codes (DTCs) |
| Fault code | SPN 4258 / FMI 4 (EPA10 / GHG14) |
| Monitored parameter | Injector amplifier control valve, cylinders 4, 5 and 6 |
| Enabling condition | fis_nop_act > 1.85 |
| Dash lamps | MIL, CEL |
| Engine reaction | 25% derate |
| Verification | Engine RPM 1400-1500 (1 minute) |
| Pages | 4 pages |
| Source | Detroit Power Service Literature |
| Format | PDF, English |
Diagnostic steps in this manual
The four-page flow verifies software, then resistance-tests each injector.
- Confirm the Motor Control Module (MCM) software is V13.x or higher, reprogramming it if needed.
- Inspect the rear fuel injector harness 14-pin connector for bent pins and water or oil intrusion.
- Measure resistance (greater than 3 ohms) at pin 5 for injectors 4, 5 and 6, using tool J-48671-10.
- Replace the affected injector per the Three-Filter System procedure, or trace shorts to the 120-pin MCM connector.
Injector and harness removal follow the Three-Filter System procedures in Detroit Power Service Literature, with the MCM replaced only as a last step. Because SPN 4258 FMI 4 is a factory-defined code, following the exact injector amplifier control valve sequence and the Detroit Power Service Literature references is what keeps the repair verifiable.
Applicable trucks and engines
This procedure applies to Detroit DD Series diesel engines built to EPA 2007 and later standards, and Detroit cross-references the same code on Series 60 (DDEC VI, EPA 2007) engines. Confirm exact coverage on the Detroit Diesel official website.
Who needs this SPN 4258 FMI 4 guide
Heavy-duty technicians and workshop owners diagnosing injector amplifier control valve problems use this guide to follow the factory troubleshooting steps instead of guessing. The full PDF is available in the DiagTechPro manuals library, with a free account required to download.
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