SPN 3509 EPA10 GHG14 is documented in this Detroit DD Series fault code reference PDF, which covers the 5V Sensor Supply Bank 1 Circuit Failed Low condition on Detroit engines. The 1-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) engines on the EPA10 and GHG14 platforms using the ACM |
| System / group | DD Series (EPA 2007-Current) / DTCs |
| Diagnostic code | FMI 4 / SPN 3509 |
| Year / revision | Source dated 2017 |
| Pages | 1 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code identification: SPN 3509, FMI 4
- 5V sensor supply bank 1 failed low
- Monitored parameter and dash lamps
- DOC inlet pressure sensor inspection
- ACM connector resistance measurement
- Wire repair or sensor replacement
Applicable truck models and engines
This fault code applies to Detroit DD Series (EPA 2007-Current) engines on the EPA10 and GHG14 platforms using the ACM, and the DiagTechPro library also files it under the Series 60 (DDEC VI, EPA 2007) DTC set. The diagnostic references the Aftertreatment Control Module (ACM) used on these Detroit powertrains. See the manufacturer’s Detroit official website for current engine specifications and dealer support.
SPN 3509 EPA10 GHG14 troubleshooting overview
The monitored parameter is the ACM 5V internal power supply. With the ignition off, the technician disconnects the Diesel Oxidation Catalyst (DOC) inlet pressure sensor connector and inspects the harness for bent, spread or corroded pins, then disconnects the ACM 120-pin connector. Resistance from pin 3 on the harness side of the DOC inlet pressure sensor connector to ground is measured; a value under 1K ohms directs repairing the wire back to pin 117 of the ACM connector, while a higher value directs replacing the DOC inlet pressure sensor per Power Service Literature.
Who needs this SPN 3509 EPA10 GHG14 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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