The Detroit transmission output shaft fault-code sheet is a Detroit DD Series (EPA 2007-Current) troubleshooting document for a J1939 transmission output-shaft speed signal that is erratic on CPC4 and MCM2.1 vehicles. It reproduces the official fault identification, the monitored parameters or service notes printed on the document, and the recommended diagnostic actions a heavy-duty technician follows step by step.
Detroit transmission output shaft document details
| Brand | Detroit |
| Model coverage | Detroit DD Series engines (DD13, DD15 and DD16) from EPA 2007-Current, with equivalent coverage noted for Series 60 (DDEC VI) applications. |
| System / Group | DD Series (EPA 2007-Current) / DTCs |
| Publication no. | Not printed on document; sourced from Detroit Power Service Literature |
| Year / Revision | © 2017 |
| Pages | 2 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code identification — SPN 191 / FMI 19
- Note: CPC4 and MCM2.1 shared SPNs
- Companion-code checks
- CPC4 reprogramming question
- Module communication and OEM wiring reference
Applicable truck models
Detroit DD Series engines (DD13, DD15 and DD16) from EPA 2007-Current, with equivalent coverage noted for Series 60 (DDEC VI) applications. Fault code SPN 191 / FMI 19 is diagnosed with a diesel diagnostic tool such as DDDL or DDRS. For factory procedures and the latest module software, see the Detroit Diesel official website.
Diagnostic steps and checks
A note explains that the CPC4 can share SPNs with MCM2.1 faults and that DDDL 7.08 SP2 separates the two. The technician checks for CPC4 SPN 168/FMI 0/14/18 battery codes and MCM2.1 SPN 625/FMI 9, repairing those or the Controller Area Network line first, then asks whether the CPC4 was reprogrammed. If not, the diesel diagnostic tool lists the configured modules and their communication status, and Original Equipment Manufacturer literature is used for the wiring schematics.
Who needs this Detroit transmission output shaft manual
This troubleshooting sheet suits Detroit-certified technicians and independent heavy-duty workshops that read SPN 191/FMI 19 on a scan tool and want the factory decision tree, pin references and component checks before replacing parts.
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