This CAT 0041-03 8 volt supply troubleshooting document provides the official diagnostic procedure for fault code PID 0041 FMI 03 on Caterpillar 3406E, C-10, and C-12 on-highway truck engines. It details the conditions that generate the code, system response behavior, possible performance effects, and the required test steps to resolve high 8 volt supply voltage.
Official CAT 0041-03 8 volt supply document details
| Brand | Caterpillar (CAT) |
| Model coverage | C-12 Truck Engine 9NS; 3406E, C-10, C-12 On-highway Engines |
| System / Group | 3406E C10 C12 (8YS, 9NS, 5DS, or 1LW) — Diagnostic Trouble Codes |
| 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
- 0041-03 8 Volt Supply Voltage High (21) — SMCS 5574-038
- Conditions Which Generate This Code (PID 0041 FMI 03)
- System Response
- Possible Performance Effect
- Troubleshooting: Test Step 1 — Accelerator Pedal (Throttle) Position Sensor Circuit – Test
Applicable truck models
This document applies to Caterpillar truck engines in the 3406E, C-10, and C-12 families with serial prefix configurations 8YS, 9NS, 5DS, or 1LW. The specific configuration referenced is the C-12 Truck Engine 9NS00001-UP. The Engine Control Module (ECM) monitors the 8 volt supply that powers the accelerator pedal position sensor; when supply voltage exceeds 8.5 VDC for more than one second after the ECM has been powered for at least three seconds, the code is triggered. An active code illuminates the check engine lamp and may limit the engine to low idle. For additional Caterpillar service literature, visit Caterpillar Official Support.
Who needs this 0041-03 8 volt supply manual
Diesel mechanics and workshop owners troubleshooting a check engine lamp caused by high 8 volt supply voltage on 3406E, C-10, or C-12 engines will find this guide essential. It is particularly relevant when diagnosing accelerator pedal position sensor faults tied to DTC PID 0041 FMI 03.
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