SPN 520332 FMI 17 is a Detroit DD Series diagnostic fault-code sheet that documents the DOC Inlet Temperature Out of Range Low condition and its factory troubleshooting sequence. The sheet lists the SPN and FMI identifiers, a short description of the condition, and the repair steps in the order Detroit recommends. It is a concise reference sheet, 2 pages long, aimed at technicians who read the code with a scan tool and need to know the correct next step.
SPN 520332 FMI 17 troubleshooting overview
This sheet covers the Diesel Oxidation Catalyst (DOC) inlet temperature out of range low condition, which indicates a High Idle Regen (HIR) was aborted because the DOC inlet temperature did not reach the 270°C (518°F) minimum needed to begin dosing. The monitor watches exhaust temperature, lights the MIL and is verified by a parked regen.
Official document details
| Brand | Detroit (Detroit Diesel) |
| Model coverage | DD Series (EPA 2007-Current) |
| System / group | Diagnostic Trouble Codes (DTCs) |
| SPN | 520332 |
| FMI | 17 — DOC Inlet Temperature Out of Range Low |
| Source | TruckFaultCodes.com fault-code reference (Copyright 2017) |
| Pages | 2 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code identification: SPN and FMI header
- Description: exhaust temperature monitor, MIL, HIR dosing threshold of 270°C (518°F)
- Step 1: check for other active faults
- Step 2: inspect intake throttle valve, exhaust and intake leaks, charge air cooler, Jake Brake and thermostat
- Step 3–5: compare DOC inlet, DOC outlet and DPF outlet temperatures, inspect and replace the DOC inlet temperature sensor
Applicable truck models
This code sheet applies to Detroit DD Series engines (DD13, DD15 and DD16) built to GHG14 emissions specifications under the EPA 2007-Current platform, and Detroit cross-lists it under both the DD Series and Series 60 (DDEC VI, EPA 2007) diagnostic trees. For factory service literature and warranty details, refer to the official Detroit Diesel website.
Who needs this SPN 520332 FMI 17 manual
This reference is written for aftertreatment technicians chasing aborted regens who need the DOC inlet temperature checks and sensor test sequence. Keep the 520332 FMI 17 sheet on hand so the code can be diagnosed and verified before it is cleared.
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