Eaton Fault Code 26 is the diagnostic trouble code raised when the transmission detects a clutch slip event on a Fuller Advantage Heavy Duty automated transmission. This two-page section of publication TRTS0980 documents the J1939 SPN 522 FMI 10 definition, how the TECU compares engine speed with Input Shaft Speed Sensor values, the fallback behaviour and the possible clutch causes. Use it to confirm whether a slipping Heavy Duty Electronic Clutch Actuator is genuine before any disassembly.
Official document details
| Brand | Eaton |
|---|---|
| Model coverage | Fuller Advantage & Fuller Advantage Heavy Duty automated transmission |
| System / Group | DTCs – Fault Isolation Procedures |
| Publication no. | TRTS0980 |
| Year / Revision | 2016 (Rev. 2016.06.20) |
| Pages | 2 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Eaton Fault Code 26 table of contents
- Overview and fault description
- Detection method
- Conditions to set the fault code active
- Fallback and dashboard symptoms
- Conditions to set the fault code inactive
- Possible causes
- Component identification
Applicable truck models covered
This page applies to any heavy-duty truck fitted with the Eaton Fuller Advantage or Fuller Advantage Heavy Duty automated transmission and its Heavy Duty ECA clutch, regardless of chassis OEM. Because the TECU monitors engine speed over the J1939 data link, the code also involves the OEM engine controller, and connector pin-outs remain OEM proprietary. Full transmission specifications are published on the manufacturer’s official Eaton transmissions website.
Who needs this Eaton Fault Code 26 manual
Fleet technicians, driveline specialists and workshop owners troubleshooting a flashing “F” or reduced engine torque need this reference to interpret the SID 55 data and inspect the clutch wear tab, release bearing and grease zerk before condemning parts. The page also notes that intermittent engine-speed loss over the data link, not the clutch itself, can trigger the event, so the OEM engine controller should be scanned before removing the transmission.
The complete PDF, published under Eaton document TRTS0980, is available in the DiagTechPro manuals library; a free account is required to download it.
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