This Cummins fault code 544 PDF is the official Top 2 Transmission Circuit – Mechanical System Failure troubleshooting chart for the Cummins ISM CM570 (1999-02) engine platform, covering PID S151, SPN 611, FMI 7/7 and the Yellow warning lamp. It is a step-by-step diagnostic flow, not a general manual, and it takes a technician from symptom to confirmed repair on this specific code.
Cummins fault code 544 explained
The Top 2 transmission circuit controls a Top 2 transmission to autoshift between the Top 2 gears. The Top 2 shift and lockout solenoids are on the topside of the transmission near the back; use the OEM diagram for the exact location. The chart checks whether Fault Codes 536 and 537 are inactive, then runs the click test using the diagnostic tool and datalink adapter.
Official document details
| Brand | Cummins |
| Model coverage | ISM, ISX and Signature CM570 (1999-02) |
| System / Group | DTCs — Top 2 Transmission Circuit – Mechanical System Failure |
| Fault identifiers | Fault Code 544, PID S151, SPN 611, FMI 7/7, Yellow lamp |
| Source / Revision | TruckFaultCodes.com, Copyright 2017 |
| Pages | 7 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Circuit Description
- Component Location
- Shop Talk
- Troubleshooting Steps
- Fault code verification and clearing
Applicable truck models
This chart applies to on-highway trucks and equipment built on the Cummins ISM, ISX and Signature CM570 (1999-02) engines with the CM570 electronic control module. Because component and battery locations vary by chassis maker, the document repeatedly refers you to the OEM manual for exact positions. For engine specifications and dealer support, see the official Cummins engine site.
Who needs this Cummins fault code 544 manual
Heavy-duty diesel technicians and workshop owners servicing ISM, ISX or Signature CM570 engines need this chart to diagnose the Top 2 Transmission Circuit – Mechanical System Failure correctly instead of guessing at parts. It pairs with a diagnostic scan tool and standard shop meters.
The full PDF is available in the DiagTechPro manuals library; a free account is required to download it.
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