Fault Code 23 troubleshooting is the four-page fault-isolation procedure for a missing brake signal behind the Urge to Move feature on the Eaton Fuller Advantage Heavy Duty transmission. This section of publication TRTS0980 monitors brake pedal position on SPN 521 and brake application pressure on SPN 116 in ServiceRanger, compares released and depressed readings, then confirms with the OEM whether the required secondary brake message exists. It ends by disabling the feature if the vehicle cannot support it.
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 | 4 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Fault Code 23 troubleshooting table of contents
- Step A – Check for active or inactive fault codes
- Step B – Monitor brake pedal position (SPN 521)
- Step C – Monitor brake application pressure (SPN 116)
- Step D – Contact the OEM regarding brake signal availability
- Step V – Validate repair
Applicable truck models covered
The procedure applies to Eaton Fuller Advantage and Fuller Advantage Heavy Duty automated transmissions configured with the Urge to Move feature, on any chassis OEM. It reads the SPN 521 and SPN 116 sources over the J1939 data link, and the secondary brake messages are OEM determined, so OEM guidance is required. Transmission data is published on the manufacturer’s official Eaton transmissions website.
Who needs this Fault Code 23 troubleshooting manual
Technicians investigating a truck that will not creep or that logs a brake-signal fault use this procedure to confirm valid pedal-position and application-pressure data before repairing the signal or disabling the feature. The result is a clear decision between repairing the brake signal and disabling a feature the vehicle was never equipped to support in the first place.
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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