This CAT C15 intake manifold temperature troubleshooting document provides the official Caterpillar diagnostic procedure for DTC 0105-00, the High Intake Manifold Air Temperature Warning (64). It applies to C15 On-Highway Truck Engines with MXS, NKS, or RKS serial prefix configurations and guides technicians through a structured fault-isolation sequence to resolve excessive intake air temperatures.
Official CAT C15 intake manifold temperature document details
| Brand | Caterpillar (CAT) |
| Model coverage | C15 Truck Engine — MXS, NKS, RKS configurations |
| System / Group | DTCs — SMCS 1439-038-AI; 1921-038 |
| Publication no. | RENR5088-10 |
| Year / Revision | Published 01/02/2009, updated 25/02/2009 |
| Pages | 2 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Document table of contents
- 0105-00 High Intake Manifold Air Temperature Warning (64) — Conditions Which Generate This Code
- System Response
- Test Step 1. Check the Coolant Level
- Test Step 2. Check the Aftercooler
Applicable truck models
This guide covers the Caterpillar C15 On-Highway Truck Engine in MXS (MXS00001-UP), NKS, and RKS configurations. The C15 is widely installed in Class 8 heavy-duty trucks used for long-haul and vocational applications. The Engine Control Module (ECM) triggers DTC 0105-00 when the intake manifold air temperature exceeds 90 °C (194 °F) for more than four seconds, the engine has been running for at least 30 seconds, and the engine coolant temperature is above 99 °C (210 °F). The system response includes illumination of the warning lamp or check engine lamp depending on the “Engine Monitoring Lamps” parameter setting, and the status “DIAG” appears next to “Intake Manifold Air Temperature” in Caterpillar Electronic Technician (ET). Customer passwords are required to clear this diagnostic code. For additional product support, visit Caterpillar’s official support page.
Who needs this CAT C15 intake manifold temperature manual
Diesel mechanics and workshop owners servicing Caterpillar C15 engines will need this document when diagnosing a high intake air temperature warning. The two-step procedure — checking coolant level and inspecting the air-to-air aftercooler for debris or restriction — enables rapid fault isolation without unnecessary part replacement.
The engine coolant is used to cool the intake air after the turbochargers and before the air-to-air aftercooler, so low coolant is the first item to verify. If coolant level is correct, the aftercooler must be inspected for airflow restrictions; heavy loads combined with high ambient air temperatures can also push intake temperatures above the trip point. Each test step ends with a clear repair action and verification instruction.
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