SPN 1033 FMI 2 is the Detroit DD Series fault-code troubleshooting sheet that documents ACM2.1 engine hours data that is erratic, intermittent or incorrect on the Motor Control Module engine platform. This 1-page reference reproduces the fault-code identification and the factory decision tree so a technician can diagnose the concern before replacing parts.
Official document details
| Brand | Detroit |
|---|---|
| Model coverage | Detroit DD Series (EPA 2007-Current) |
| System / Group | DD Series (EPA 2007-Current) / DTCs |
| Fault code | FMI 2 under SPN 1033 (GHG14) |
| Source | Detroit fault-code literature via TruckFaultCodes.com, © 2017 |
| Pages | 1 |
| Format | |
| Language | English |
SPN 1033 FMI 2 fault description
This single-page sheet explains a data-consistency fault rather than a hardware failure. It usually occurs after reprogramming the Common Powertrain Controller (CPC4) or the ACM2.1, when the internal clocks of the two modules no longer match. The corrective action is straightforward: after reprogramming either module, all fault codes must be cleared. The sheet also notes that CPC4 digital outputs share some SPN numbers with Motor Control Module (MCM2.1) faults, and that the diesel diagnostic tool distinguishes between the MCM2.1 and CPC4 when a fault is diagnosed.
The SPN 1033 FMI 2 sheet identifies the following likely causes and check points:
- Occurs after reprogramming the CPC4 or ACM2.1
- Internal clocks of the CPC4 and ACM2.1 do not match
- Requires clearing all fault codes after reprogramming
Document table of contents
- Fault code identification
- Cause after module reprogramming
- Clearing fault codes to resolve the mismatch
Applicable truck models
This troubleshooting sheet applies to Detroit DD Series engines built from EPA 2007 to current that use the Motor Control Module (MCM) and Common Powertrain Controller architecture. Confirm the engine’s emissions family and calibration against the manufacturer’s official documentation at the Detroit engine website before repairs.
Who needs this SPN 1033 FMI 2 manual
Heavy-duty diesel technicians, fleet shops and mobile mechanics who retrieve this code on a Detroit DD engine need this manual to follow the factory decision tree instead of guessing. It is written for anyone using DDDL or an equivalent diesel diagnostic tool who wants the exact test values before condemning a component.
The full 1-page PDF of this procedure is available in the DiagTechPro manuals library; a free account is required to download.
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