This 2-page troubleshooting guide addresses the CAT C-12 injector fault diagnostic code 0001-11, Cylinder #1 Injector Current Fault (72), for Caterpillar 3406E, C-10, and C-12 on-highway truck engines. It explains the conditions that generate the code, the system response from the Engine Control Module (ECM), possible performance effects, and the recommended test procedure to resolve the issue.
Official CAT C-12 injector fault document details
| Brand | Caterpillar (CAT) |
| Model coverage | C-12 Truck Engine 9NS00001-UP; also applies to 3406E, C-10 |
| System/Group | 3406E C10 C12 (8YS, 9NS, 5DS, or 1LW) — Diagnostic Trouble Codes (DTCs), SMCS 1290-038 |
| 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
- 0001-11 Cylinder #1 Injector Current Fault (72) — PID 0001 FMI 11
- Conditions Which Generate This Code
- System Response
- Possible Performance Effect
- Troubleshooting — Test Step 1: Perform “Injector Solenoid Circuit – Test”
Applicable truck models
This document applies to Caterpillar truck engines in the 3406E, C-10, and C-12 families. The specific configuration referenced is the C-12 Truck Engine serial number prefix 9NS (9NS00001-UP), but the guide also covers engine prefixes 8YS, 5DS, and 1LW. These engines are widely used in Class 8 on-highway trucks from manufacturers such as Peterbilt, Kenworth, and Freightliner. For official Caterpillar parts and service resources, visit Caterpillar Support and Service.
Who needs this CAT C-12 injector fault manual
Diesel mechanics and workshop owners troubleshooting a Check Engine lamp caused by DTC 0001-11 on a 3406E, C-10, or C-12 engine will find this guide essential. It walks through the ECM-detected open-circuit or short-circuit conditions in the Cylinder #1 injector solenoid wiring and directs technicians to the Injector Solenoid Circuit test procedure.
The document explains that when the diagnostic code is active, the ECM logs a snapshot, the check engine lamp illuminates, and the automatic Cylinder Cutout Test is disabled. Symptoms include engine misfires and low power because the affected injector may not operate. Resolving the fault requires completing Test Step 1 — the Injector Solenoid Circuit test — and verifying the result is OK before returning the engine to service.
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