The SPN 625 FMI 18 fault code manual covers the Detroit no-ACM-communication warning fault, which indicates an interruption in ACM to Motor Control Module (MCM) communication and refers to MCM SPN 1231/FMI 9. This DiagTechPro library page summarizes the official Detroit troubleshooting sheet so technicians can confirm the No Aftertreatment Control Module (ACM) Communication – Warning condition before opening the full PDF.
Official document details
| Brand | Detroit (Detroit Diesel) |
|---|---|
| Model coverage | DD Series (EPA 2007-Current) heavy-duty diesel engines, including DD13, DD15 and DD16 |
| System / group | DD Series (EPA 2007-Current) / DTCs |
| Fault code | SPN 625 / FMI 18 – No Aftertreatment Control Module (ACM) Communication – Warning |
| Emissions platform | EPA10 / GHG14 |
| Pages | 1 |
| File size | 0.2 MB |
| Format | |
| Language | English |
SPN 625 FMI 18 troubleshooting contents
The Detroit fault code sheet walks through these sections and diagnostic steps in order:
- Fault code identification (SPN 625, FMI 18)
- Description: interruption in ACM/MCM communication
- Follow the service procedure for MCM SPN 1231/FMI 9
- ACM message not received or has stopped arriving
Because these Detroit sheets present pass and fail decision points rather than long narrative, technicians should record each measured value as they proceed and compare it against the limits shown before replacing any control module, harness or sensor.
Applicable truck models covered
This diagnostic applies to Detroit DD Series (EPA 2007-Current) engines built to the EPA10 / GHG14 emissions configuration, covering the DD13, DD15 and DD16 used in Freightliner and Western Star trucks. It references the Motor Control Module (MCM) and Common Powertrain Controller (CPC) that manage the affected circuit. Always confirm engine calibration against the official specification on the Detroit Diesel manufacturer website before condemning any component.
Who needs this SPN 625 FMI 18 manual
Heavy-duty truck technicians, fleet maintenance teams and workshop owners diagnosing this Detroit fault code use this sheet to follow the manufacturer procedure instead of guessing. The source sheet is published by TruckFaultCodes.com (Copyright 2017) and lists the Detroit Customer Support Center at 800-445-1980 for unresolved cases.
The complete PDF is available in the DiagTechPro manuals library; a free account is required to download it.
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