This Fault Code 72 troubleshooting guide is the official Eaton fault isolation procedure for an X-Y Shifter rail-selection problem on the Fuller Advantage Heavy Duty automated transmission. It moves from recording codes through PD Mode to a full mechanical inspection of the shifter and Shift Bar Housing.
Official document details
| Brand | Eaton |
| Model coverage | Fuller Advantage Heavy Duty automated transmission |
| System / group | Fuller Advantage Heavy Duty / DTCs — Diagnostic Trouble Codes |
| Publication no. | TRTS0980 |
| Revision | 2016.06.20 |
| Pages | 5 |
| File size | 0.74 MB |
| Format | |
| Language | English |
Fault Code 72 troubleshooting contents
The document is organised as a set of numbered fault isolation steps, each with a stated purpose and a clear go-to branch that sends the technician to the next step, a repair or the final verification. The main sections cover:
- Recording codes and ruling out codes 33, 34, 51, 52, 61, 63 and 64
- Using Product Diagnostic (PD) Mode to locate intermittent failures
- Inspecting batteries, in-line fuse and TECU power and ground
- Inspecting the X-Y Shifter and Transmission Harness for damage
- Inspecting X-Y Shifter internal components and the Shift Bar Housing
- Inspecting internal transmission components and verifying the repair
Applicable truck models
This Eaton fault isolation procedure applies to trucks fitted with the Fuller Advantage Heavy Duty automated manual transmission, its Transmission Electronic Control Unit (TECU) and X-Y Shifter. Every step is performed with ServiceRanger, the Eaton diagnostic software, and cross-referenced to the wider TRTS0980 Fault Isolation Procedures manual. Manufacturer background and current service literature are published on Eaton’s official transmission website.
Who needs the Fault Code 72 troubleshooting manual
Workshop owners diagnosing a truck that will not select the next rail use this Eaton procedure to isolate harness, shifter and Shift Bar Housing faults in sequence rather than swapping parts on guesswork.
Because it is drawn straight from Eaton document TRTS0980, the page gives shop staff the same decision trees, connector pin references and pass-or-fail values the manufacturer uses, which shortens diagnosis time and supports accurate warranty documentation.
Related manuals library
The full 5-page PDF, published as Eaton document TRTS0980, is available in the DiagTechPro manuals library; a free account is required to download.
