Diagnostics

Komatsu Engines Fault Codes: Meanings, Causes & Fixes

In-depth, plain-English guides to Komatsu Engines fault codes and error codes. Each guide covers what the code means, what triggers it, the most common causes, and the first things to check before you call the dealer.

281Engine Fuel Pump Pressurizing Assembly 1 - Mechanical System Not Responding or Out of Adjustment
285SAE J1939 Multiplexing PGN Timeout Error - Abnormal Update Rate
3561Aftertreatment Diesel Exhaust Fluid Dosing Unit - Current Below Normal or Open Circuit

Looking for a different Komatsu Engines code?Search the full fault-code database, or hand the code to the AI assistant for a plain-English explanation.

Safety-critical: confirm before use

Torque, lifting, and load-chart values are safety-critical. Never operate from these figures alone. Confirm against the official manual and a qualified technician.