This PACCAR transfer case oil temperature gauge diagnostic manual covers fault codes DTC 138803 (open circuit) and DTC 138804 (short circuit) affecting the transfer case oil temperature gauge in PACCAR trucks from 2011 and newer. Published by PACCAR as part of their Electrical System Service Manual, this document provides step-by-step troubleshooting procedures using the Electronic Service Analyst (ESA) diagnostic tool.
Document details
| Brand | PACCAR |
| Model coverage | 2011 & Newer PACCAR trucks |
| System/Group | DTCs / Cab Electrical |
| Publication number | PM819003/KM815056 |
| Year/Revision | 09/16/2011 |
| Pages | 4 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Table of contents
- Transfer Case Oil Temperature Gauge Inoperative — DTC 138803 and DTC 138804
- Diagnostic procedures using Electronic Service Analyst (ESA)
- Step-by-step gauge monitoring and simulation tests
- CVSG data link wiring continuity checks
- Sensor connector pin diagnosis (Pin A ground, Pin B signal)
- Thermistor resistance values table (−40°F to 392°F)
- Active DTC analysis and fault isolation methods
- Sensor replacement and wiring repair procedures
Applies to
This manual applies to PACCAR cab instrumentation systems in trucks manufactured 2011 and newer, specifically addressing the transfer case oil temperature gauge circuit and thermistor sensor assemblies. Covers the Chassis Node electrical connections and CECU (Cab Electronic Control Unit) 52-pin connector diagnostics. For official PACCAR technical documentation and support, visit PACCAR official website.
Who needs this PACCAR transfer case oil temperature gauge manual
This PACCAR transfer case oil temperature gauge service manual is essential for ASE-certified diesel technicians, PACCAR-trained service specialists, and workshop owners diagnosing multiplexed instrumentation faults. The detailed electrical schematic procedures and sensor replacement guidance make this resource invaluable for shops equipped with ESA diagnostic software and working on 2011+ PACCAR fleet trucks.
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