This is the official 2013 PACCAR MX Diagnostic Service Manual covering the CAN communication fault U1126 code U1126. Published by PACCAR for EPA 2013 MX engines, this manual provides step-by-step troubleshooting procedures for CAN network communication errors related to the Body Builder Module TSC1_SE message rate being too low. The document includes electrical diagrams, diagnostic conditions, and verified repair verification drive cycles.
Document details and specifications — CAN communication fault
| Brand | PACCAR |
| Model coverage | MX Engines |
| System/Group | DTCs / MX Engines (EPA2013) |
| Publication number | 163–166 |
| Year/Revision | 2013 |
| Pages | 4 |
| File size | 0.6 MB |
| Format | |
| Language | English |
Table of contents
- Code number U1126
- Fault code description: CAN communication — Message (TSC1_SE) rate too low from Body Builder Module
- Fault code information and readiness group
- Description and location of components
- Diagnostic conditions and set/reset conditions
- Electrical diagrams
- Technical data
- Possible causes: CAN network breakdown, open circuit, short circuit to ground or supply
- Diagnostic Step-by-Step procedures (Steps 1–4)
- Verification drive cycle
Applies to these models
This CAN communication fault U1126 manual applies to 2013 PACCAR MX engines equipped with EPA 2013 emissions control systems. The communication fault U1126 code U1126 is triggered when the TSC1_SE message transmission rate from the Body Builder Module falls below acceptable thresholds, indicating wiring faults or module communication breakdown on the CAN bus network. For additional manufacturer resources, visit PACCAR official.
Who needs this communication fault U1126 manual
Diesel mechanics, workshop technicians, and fleet service managers diagnosing PACCAR MX engine communication errors will find this communication fault U1126 guide essential. Use it to isolate CAN network wiring defects, Body Builder Module connectivity issues, and verify repairs using the supplied verification drive cycle procedure.
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