This document is a CAT C15 power derate troubleshooting guide covering diagnostic code 0166-14, which addresses rated engine power special instructions for the C15 on-highway truck engine. It details the exact coolant temperature thresholds that trigger ECM-controlled power derating and the steps required to diagnose and resolve the issue. The publication is essential for technicians working on C15 MXS-prefix engines experiencing reduced power output.
Official CAT C15 power derate document details
| Brand | Caterpillar (CAT) |
| Model coverage | C15 Truck Engine MXS (MXS00001-UP) |
| System / Group | Engine Power Derate / Diagnostic Trouble Codes (SMCS 1901-038) |
| Publication no. | RENR5088-10 |
| Year / Revision | Published 01/02/2009, Updated 25/02/2009 |
| Pages | 1 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Document table of contents
- 0166-14 Rated Engine Power Special Instructions
- Conditions Which Generate This Code
- System Response
- Test Step 1: Check the Coolant System
Applicable truck models
This troubleshooting document applies to the Caterpillar C15 on-highway truck engine with the MXS serial number prefix (configuration C15 On-Highway Truck MXS00001-UP). It also references configurations NKS and RKS within the C15 engine family. The guide is specific to engines equipped with the Engine Coolant Temperature Derate Enable Status parameter in the ECM. Mechanics working on any Class 8 truck platform powered by these C15 variants — including Peterbilt, Kenworth, and Freightliner models that commonly use this engine — will find the information relevant. For official Caterpillar parts lookup and additional service literature, visit Caterpillar Support and Service Resources.
Who needs this C15 power derate manual
Fleet maintenance technicians and independent diesel mechanics diagnosing a C15 power derate triggered by elevated coolant temperatures need this document. Workshop owners handling DTC 0166-14 will use it to understand that the ECM limits power by three percent at 103 °C (217 °F) and by six percent at 104 °C (219 °F), and that customer passwords are required to clear the code after repairs.
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