SPN 3556 FMI 0 is documented in this Detroit DD Series fault code reference PDF, which covers the Regen Temperature Out Of Range High condition on Detroit engines. The 4-page document lists the fault description, the step-by-step troubleshooting sequence and the connector measurements a technician uses to confirm the repair.
Official document details
| Brand | Detroit |
|---|---|
| Model coverage | Detroit DD Series (EPA 2007-Current) GHG14 engines with the aftertreatment system |
| System / group | DD Series (EPA 2007-Current) / DTCs |
| Diagnostic code | FMI 0 / SPN 3556 |
| Year / revision | Source dated 2017 |
| Pages | 4 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code identification: SPN 3556, FMI 0
- Regen temperature out of range high
- Monitored parameter and engine reaction
- Temperature comparison checks
- DOC sensor harness and resistance checks
- Sensor replacement per literature
Applicable truck models and engines
This fault code applies to Detroit DD Series (EPA 2007-Current) GHG14 engines with the aftertreatment system, and the DiagTechPro library also files it under the Series 60 (DDEC VI, EPA 2007) DTC set. The diagnostic references the aftertreatment temperature sensor circuits used on these Detroit powertrains. See the manufacturer’s Detroit official website for current engine specifications and dealer support.
SPN 3556 FMI 0 troubleshooting overview
The monitored parameter is DOC Temperature Out, and the document notes a 25% derate with the MIL and CEL illuminated. After checking for related codes, the technician compares Diesel Oxidation Catalyst inlet, DOC outlet and Diesel Particulate Filter outlet temperatures within 45°F, first key-on and then during a ten-minute idle. If the readings diverge the DOC inlet and outlet temperature sensor harnesses are inspected for pin damage and each sensor’s resistance is measured at the pigtail, replacing the GHG14 DOC inlet temperature sensor per Power Service Literature when it is out of range.
Who needs this SPN 3556 FMI 0 manual
Detroit-certified technicians, independent truck repair shops and fleet maintenance teams will use this reference to follow the factory diagnostic sequence with a diesel diagnostic tool before replacing any control module or sensor.
The full PDF is available in the DiagTechPro manuals library; a free account is required to download it, alongside the related Detroit Power Service Literature.
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