The water pump limp home document is a Detroit fault code reference that explains a water pump limp home mode caused by cooling-system or coolant-sensor conditions, published for DD Series engines under SPN 5927 FMI 2 (GHG14). It gives workshop technicians the diagnostic sequence used to confirm the condition and return the truck to service, sourced from Detroit Power Service Literature.
Official document details
| Brand | Detroit (Detroit Diesel) |
| Model coverage | DD Series (EPA 2007-Current) and Series 60 (DDEC VI) |
| System / Group | Diagnostic Trouble Codes (DTCs) |
| Fault code | SPN 5927 / FMI 2 |
| Emissions family | GHG14 |
| Pages | 4 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code identification — SPN 5927 / FMI 2
- Fault description and causes
- Cooling system inspection steps
- Coolant sensor connector inspection
- Coolant sensor resistance verification
Troubleshooting the pump limp home code
The procedure rules out SPN 110 and SPN 1636 codes, compares coolant inlet and outlet temperatures with the engine cold, and inspects the cooling system including thermostat, radiator, fan belt, shroud, hoses and viscous fan. It brings the engine to operating temperature, then inspects the inlet and outlet coolant sensor connectors for pin damage and checks each coolant sensor resistance against the specification chart before clearing faults.
Applicable truck models and engines
This diagnostic sheet applies to Detroit DD Series diesel engines built to EPA 2007 through current emissions standards, and the covered fault also appears on Series 60 (DDEC VI) applications listed in the source. Confirm the exact engine family and calibration against the vehicle before making repairs, and cross-check the specifications on the official Demand Detroit website.
Who needs this pump limp home manual
Heavy-duty truck technicians, fleet maintenance staff and workshop owners diagnosing SPN 5927 FMI 2 with a diesel diagnostic tool will use this sheet to follow the correct steps rather than replacing parts by guesswork.
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