Diagnostics

Caterpillar Fault Codes by Machine Type

244 plain-English Caterpillar fault-code and error-code guides, organized by machine type. Pick the machine to browse its codes: each guide covers what the code means, what triggers it, common causes, and the first checks.

CAT43 guides
CAT Engine199 guides
Backhoe2 guides

Looking for a different Caterpillar 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.