This document provides CAT 3406E ECM battery troubleshooting instructions for intermittent battery power diagnostic code 0168-02 (PID 0168 FMI 02) on Caterpillar on-highway truck engines. It details the conditions that generate the fault code, the system response, possible performance effects, and the required test procedure to resolve the issue.
Official CAT 3406E ECM battery troubleshooting document details
| Brand | Caterpillar (CAT) |
| Model coverage | 3406E, C-10, C-12 On-highway Truck Engines (8YS, 9NS, 5DS, 1LW configurations) |
| System / Group | Engine Control Module (ECM) — Battery Power Circuit — SMCS 1401-038 |
| 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
- 0168-02 ECM Battery Power Intermittent (51) — Overview
- Conditions Which Generate This Code
- System Response
- Possible Performance Effect
- Troubleshooting — Test Step 1: Ignition Key Switch Circuit and Battery Supply Circuit Test
Applicable truck models
This troubleshooting document applies to Caterpillar on-highway truck engines in the 3406E, C-10, and C-12 families, specifically serial prefix configurations 8YS, 9NS, 5DS, and 1LW. The C-12 Truck Engine 9NS00001-UP is explicitly referenced. The diagnostic code 0168-02 is triggered when the ECM detects that battery voltage drops below 6 VDC for at least 0.50 seconds, or when three voltage readings in the past seven seconds fall below 6 VDC, while the engine is running and the ignition key switch is in the ON position. The ECM must have been powered for at least three seconds and the engine must not be cranking. The system response may include fuel injection interruption, illumination of the check engine lamp and warning lamp, RPM fluctuations, or intermittent to complete engine shutdowns. The prescribed corrective action is to perform the “Ignition Key Switch Circuit and Battery Supply Circuit – Test” procedure. For official Caterpillar technical resources, visit Caterpillar Support.
Who needs this CAT 3406E ECM battery troubleshooting manual
Diesel mechanics and workshop owners diagnosing intermittent battery power faults on CAT 3406E, C-10, or C-12 truck engines will need this document. It is essential for anyone encountering diagnostic code 0168-02 (PID 0168 FMI 02) and experiencing unexplained engine shutdowns or RPM instability linked to ECM battery supply issues.
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