This 13-page PDF is the official CAT C15 DTC 0041-03 troubleshooting procedure for diagnostic code 0041-03 (8 Volt Supply Voltage High, FMI 03) on Caterpillar C15 on-highway truck engines. It provides step-by-step test procedures for the accelerator pedal position sensor circuit, including wiring inspection, duty cycle measurement, ECM voltage verification, and component replacement guidance.
Official CAT C15 DTC 0041-03 document details
| Brand | Caterpillar (CAT) |
| Model coverage | C15 Truck Engine MXS (MXS00001-UP) |
| System / Group | Engine Control Module — 8 Volt Supply / Accelerator Pedal Position Sensor (SMCS 1439-038) |
| Publication no. | RENR5088-10 |
| Year / Revision | Published 01/02/2009, Updated 25/02/2009 |
| Pages | 13 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- 0041-03 8 Volt Supply Voltage High (PID 0041 FMI 03) — Conditions, System Response, Possible Performance Effect
- Accelerator Pedal (Throttle) Position Sensor Circuit — Test (covers DTCs 41-03, 41-04, 91-08, 91-13)
- Test Step 1: Monitor the Status for the Accelerator Pedal Position using Cat ET
- Test Step 3: Inspect the Electrical Connectors and the Wiring (J1/P1 ECM connector, firewall bulkhead connector, sensor connector)
- Test Step 5: Check the Duty Cycle at the Sensor (7X-6370 Adapter Cable breakout)
- Test Step 8: Disconnect the 8 Volt Sensor while Monitoring Active Diagnostic Codes
- Final voltage verification at P1-4 (8 V sensor supply) — ECM replacement procedure if out of 8.0 ± 0.4 VDC specification
Applicable truck models
This document applies to the Caterpillar C15 on-highway truck engine, configuration MXS00001-UP (also referenced alongside NKS and RKS serial prefixes in the C15 engine family). The procedure addresses the ECM 8 volt supply circuit that powers the accelerator pedal position sensor at connector P1-4, with sensor return at P1-5 and signal at P1-66. The duty cycle specifications cover low idle (10–22 percent) and full throttle (75–90 percent). PTO mode interactions with remote switches or remote throttle configurations are also discussed. For official Caterpillar service resources, visit Caterpillar Support.
Who needs this CAT C15 DTC 0041-03 manual
Diesel mechanics and workshop owners troubleshooting a check engine lamp caused by an 8 volt supply overvoltage condition on C15 engines need this document. It is essential when the engine is limited to low idle and active code 0041-03 is logged in the ECM.
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