This Fault Code 41 troubleshooting page from the Eaton Fuller Advantage Heavy Duty service set guides a technician through the range-system fault isolation procedure. Published as TRTS0980, it uses air pressure gauges to confirm supply, regulator and range operation before any mechanical teardown.
Official document details
| Brand | Eaton |
| Model coverage | Fuller Advantage Heavy Duty (and Fuller Advantage) automated transmissions |
| System / Group | Fuller Advantage Heavy Duty / DTCs |
| Publication no. | TRTS0980 |
| Year / Revision | 2016.06.20 (© 2016 Eaton) |
| Pages | 5 |
| File size | 0.69 MB |
| Format | |
| Language | English |
Document table of contents
- Step A — Check for Active or Inactive fault codes
- Step B — Verify vehicle air supply pressure (90–120 PSI)
- Step C — Verify Air Filter-Regulator operation (55–65 PSI)
- Step D — Verify range operation at the diagnostic ports
- Steps E and F — Inspect Range Cylinder Cover and internal components
- Steps G, H and V — Verify range operation, auxiliary section and repair
Applicable truck models
The procedure covers Eaton Fuller Advantage Heavy Duty transmissions with a 2-speed air-shifted auxiliary range system. Model coverage and torque data are published on the Eaton Vehicle Group official website.
Fault Code 41 troubleshooting workflow
Using 0–150 and 0–100 PSI gauges, the technician verifies vehicle supply at 90–120 PSI, Air Filter-Regulator output at 55–65 PSI and low- and high-range pressures at the range cover diagnostic ports. Out-of-range or slow pressure changes lead to inspecting the Range Cylinder Cover, piston o-rings, Range Solenoid Valve and, if needed, auxiliary case components such as the Range Synchronizer and Tone Wheel.
Who needs this Fault Code 41 troubleshooting manual
Heavy-duty technicians handling a range-failed-to-engage complaint use this sheet to confirm the air system before overhauling the Range Cylinder, so mechanical repairs follow measured pressure readings rather than guesswork.
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