This document is a CAT C-12 data link fault troubleshooting guide that addresses diagnostic code 0249-11, indicating a J1922 data link communication failure on Caterpillar on-highway truck engines. It provides the conditions that generate the code, the electronic system response, and step-by-step diagnostic procedures to resolve the fault.
Official CAT C-12 data link fault document details
| Brand | Caterpillar (CAT) |
| Model coverage | C-12 Truck Engine 9NS (9NS00001-UP); also applicable to 3406E, C-10 |
| System / Group | 3406E C10 C12 (8YS, 9NS, 5DS, or 1LW) — Diagnostic Trouble Codes (DTCs), SMCS 1901-038 |
| Publication no. | RENR1328-08 |
| Year / Revision | Published 01/10/2008, Updated 16/10/2008 |
| Pages | 1 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Document table of contents
- Conditions Which Generate This Code — SAE J1922 data link communication fault description
- System Response — Electronic system response when DTC 0249-11 is active, including disabled communications with other control modules
- Power Train Data Link Customer Parameter Programming — Instructions to program “Power Train Data Link” to “None” when J1922 is not used
- OEM Dealer Contact Guidance — Determining whether the vehicle uses J1922 or J1939 data link for power train control
- Test Step 1 — Powertrain Data Link Circuit diagnostic test procedure
Applicable truck models
This troubleshooting procedure applies to Caterpillar on-highway truck engines in the 3406E, C-10, and C-12 families. Specific configuration coverage includes the C-12 Truck Engine serial number prefix 9NS (9NS00001-UP), as well as engines with prefixes 8YS, 5DS, and 1LW. The guide is relevant to any vehicle using the SAE J1922 or J1939 data link for power train control on these engine platforms. Contact the OEM dealer to confirm which data link protocol your vehicle was built to use. For official Caterpillar technical resources, visit Caterpillar Support.
Who needs this CAT C-12 data link fault manual
Mechanics and workshop owners diagnosing an active 0249-11 J1922 Data Link Fault (58) on Caterpillar 3406E, C-10, or C-12 truck engines need this guide. It is essential for technicians who must determine whether the power train data link customer parameter requires reprogramming or whether the powertrain data link circuit needs further testing.
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