This 1-page troubleshooting document provides CAT 3406E ambient temperature troubleshooting procedures for diagnostic trouble code 0171-11, “Ambient Air Temperature Data Lost.” It applies to Caterpillar 3406E, C-10, and C-12 on-highway truck engines and details the conditions that generate this fault code, the system response, and the required diagnostic test steps.
Official CAT 3406E ambient temperature troubleshooting document details
| Brand | Caterpillar (CAT) |
| Model coverage | 3406E, C-10, C-12 Truck Engines (8YS, 9NS, 5DS, or 1LW prefixes) |
| System / Group | DTCs — SMCS 1928-038 |
| 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 — ECM detection of missing ambient air temperature data from the SAE J1587 data link
- System Response — Temperature based idle shutdown override disabled; outside air temperature default set to 65 °C (149 °F)
- Test Step 1 — Perform the ATA (SAE J1587 / J1708) Data Link Circuit – Test diagnostic procedure
Applicable truck models
This document covers Caterpillar on-highway truck engines in the 3406E, C-10, and C-12 families. The specific configuration referenced is the C-12 Truck Engine 9NS00001-UP, though it also applies to serial prefix groups 8YS, 5DS, and 1LW. The fault code 0171-11 is triggered when the Engine Control Module (ECM) stops receiving ambient air temperature information via the SAE J1587 data link, and the “Allow Idle Shutdown Override” parameter is programmed to the J1587 Outside Temp Based option. For official Caterpillar parts lookup and additional technical resources, visit Caterpillar Support and Service.
Who needs this 3406E ambient temperature troubleshooting manual
Fleet mechanics and independent workshop owners diagnosing idle shutdown override failures or DTC 0171-11 on Caterpillar 3406E, C-10, or C-12 engines need this reference. It is essential for technicians working with J1587/J1708 data link circuits and ECM communication faults.
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