This 4-page troubleshooting document provides a complete list of CAT 3406E diagnostic codes for Caterpillar on-highway truck engines, including flash code numbers, fault code identifiers, and plain-language descriptions. It serves as a quick-reference resource for mechanics diagnosing electronic faults on 3406E, C-10, and C-12 engine platforms.
Official CAT 3406E diagnostic codes document details
| Brand | Caterpillar (CAT) |
| Model coverage | 3406E, C-10, C-12 Truck Engines (8YS, 9NS, 5DS, 1LW prefixes) |
| System / Group | DTCs — SMCS 1900 |
| Publication no. | RENR1328-08 |
| Year / Revision | Published 01/10/2008, updated 16/10/2008 |
| Pages | 4 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Document table of contents
- Flash Code and Code cross-reference table (Table 1)
- Ambient Air Temperature faults (codes 171-03, 171-04, 171-11)
- Idle Shutdown Override and Event Recorder codes
- Coolant Level, Fuel Temperature, and Retarder current faults
- Voltage supply faults — 8 Volt and 5 Volt supplies
- Oil Pressure, Boost Pressure, and Barometric Pressure sensor codes
- Coolant Temperature, Throttle Position, and PTO Throttle faults
- Vehicle Speed and Engine Speed signal faults
- Intake Manifold Air Temperature warnings
- ECM Battery Power, ECM Fault, and software codes
- J1939 and J1922 Data Link faults
- High Coolant Temperature and Low Coolant Level warnings
- Auxiliary Output current faults (channels #01, #02, #03)
- Transmission Not Responding and Key Switch faults
- Cylinder #1 through #6 Injector current faults
Applicable truck models
This document applies to Caterpillar 3406E, C-10, and C-12 on-highway truck engines. The specific configuration referenced is the C-12 Truck Engine 9NS00001-UP, but the flash code table covers all serial-number prefixes listed: 8YS, 9NS, 5DS, and 1LW. These engines were widely installed in Class 8 trucks from multiple OEMs during the late 1990s and 2000s. For additional technical resources and current parts support, visit Caterpillar’s official support page.
Who needs this CAT 3406E diagnostic codes manual
Fleet mechanics, independent diesel technicians, and workshop owners working on Caterpillar-powered trucks will find this flash code reference essential for rapid fault identification. It pairs each two-digit flash code with its corresponding MID/PID/SID/FMI identifier and a human-readable description, streamlining the troubleshooting process without requiring a full service manual.
The full PDF is available in the DiagTechPro manuals library. A free account is required to download.
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