SPN 4207 FMI 2 is the Detroit diesel diagnostic trouble code for the Common Powertrain Controller (CPC4) Internal Failure on DD Series (EPA 2007-Current) engines. This 1 page 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 4207 FMI 2 means
This code reports an internal failure of the Common Powertrain Controller (CPC4). The single-page document gives a short confirm-and-replace routine rather than a wiring tree.
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 4207 / FMI 2 (GHG14) |
| Monitored parameter | Common Powertrain Controller (CPC4) internal status |
| Pages | 1 page |
| Source | Detroit Power Service Literature |
| Format | PDF, English |
Diagnostic steps in this manual
The procedure separates a transient set from a genuine controller failure.
- Connect the diesel diagnostic tool, clear the faults and retest.
- If the fault becomes active again, replace the CPC4 and reprogram it with the latest software release.
- If it does not return, release the vehicle.
CPC4 replacement and reprogramming follow the latest Detroit Power Service Literature software release notes. Because SPN 4207 FMI 2 is a factory-defined code, following the exact CPC4 controller 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 4207 FMI 2 guide
Heavy-duty technicians and workshop owners diagnosing Common Powertrain Controller 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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