This CAT 0041-04 troubleshooting guide covers diagnostic code 0041-04 (FMI 04) for the 8 volt supply voltage low condition on Caterpillar 3406E, C-10, and C-12 on-highway truck engines. It details the fault conditions detected by the Engine Control Module (ECM), the system response, possible performance effects, and the recommended test procedure to resolve the issue.
Official CAT 0041-04 troubleshooting document details
| Brand | Caterpillar (CAT) |
| Model coverage | C-12 Truck Engine 9NS (9NS00001-UP); also applicable to 3406E, C-10, and C-12 On-highway Engines |
| System / Group | SMCS 5574-038 — 8 Volt Supply Circuit Diagnostics |
| 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 (PID 0041 FMI 04)
- System Response — ECM logging, snapshot trigger, check engine lamp behavior
- Possible Performance Effect — engine limited to low idle
- 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 used in on-highway applications. The specific configuration referenced is the C-12 Truck Engine serial prefix 9NS (9NS00001-UP). Additional serial prefixes covered by the broader publication group include 8YS, 5DS, and 1LW. The diagnostic code addresses the 8 volt supply that powers the accelerator pedal position sensor; when voltage falls below 7.5 VDC for more than one second after the ECM has been powered for at least three seconds, the fault is logged. If the voltage drops below 6.5 VDC, noticeable engine performance degradation may occur, and the engine may be limited to low idle. For official Caterpillar parts and service resources, visit Caterpillar Support.
Who needs this CAT 0041-04 troubleshooting manual
Diesel mechanics and workshop owners diagnosing a check engine lamp with DTC 0041-04 on 3406E, C-10, or C-12 Caterpillar engines will find the exact fault conditions, ECM behavior, and the prescribed accelerator pedal position sensor circuit test in this document. It is essential for anyone troubleshooting low 8 volt supply issues that cause an engine to default to low idle.
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