This 2-page PDF is an official 3406E C12 troubleshooting DTCs document covering diagnostic trouble code 0105-04 — Intake Manifold Air Temperature voltage low (flash code 38). It details the conditions that generate the code, the ECM system response, possible performance effects, and the required diagnostic test procedure.
Official 3406E C12 troubleshooting DTCs document details
| Brand | Caterpillar (CAT) |
| Model coverage | 3406E, C-10, C-12 On-highway Truck Engines (C-12 9NS00001-UP) |
| System / Group | Diagnostic Trouble Codes — SMCS 1921-038 (PID 0105, FMI 04) |
| Publication no. | RENR1328-08 |
| Year / Revision | Published 01/10/2008, updated 16/10/2008 |
| Pages | 2 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Document table of contents
- Conditions Which Generate This Code — ECM detection criteria: signal voltage from the intake manifold air temperature sensor below 0.2 VDC for more than eight seconds, ECM powered for at least two seconds
- System Response — ECM defaults to 85 °C (185.0 °F) for intake manifold air temperature; “DIAG” indicator displayed on Caterpillar Electronic Technician (ET); ECM activates the cooling fan
- Possible Performance Effect
- Troubleshooting — Test Step 1: Perform “Engine Temperature Sensor Open or Short Circuit – Test”
Applicable truck models
This document applies to Caterpillar 3406E, C-10, and C-12 on-highway truck engines, specifically the C-12 configuration 9NS00001-UP. Engine serial number prefixes referenced in the broader group include 8YS, 9NS, 5DS, and 1LW. These engines are commonly found in Class 8 heavy-duty trucks from multiple OEMs. For additional technical resources and parts information, visit Caterpillar Support.
Who needs this C12 troubleshooting DTCs manual
Diesel mechanics and workshop owners diagnosing a low-voltage fault on the intake manifold air temperature sensor circuit in CAT 3406E, C-10, or C-12 engines need this reference. It provides the exact voltage threshold, ECM default behavior, and the prescribed sensor open/short circuit test to resolve DTC 0105-04 (flash code 38).
The full PDF is available in the DiagTechPro manuals library. A free account is required to download.
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