What are the common causes of P0600?

Damaged or shorted wiring between modules. Corroded or loose connector pins. Faulty network interface in a module. Electromagnetic interference on the bus. Failed module pulling the network down.

Scan all modules for communication and lost-communication codes. Check the shared data bus wiring for shorts or opens. Inspect network connectors for corrosion or bent pins. Isolate modules on the bus to find the one causing dropouts. Repair damaged wiring or replace the failing module.

P0600

Serial Communication Link Malfunction

System: Computer output circuits (P code)
Lamp: Check Engine Light
Category: Powertrain - Computer and Auxiliary Controls

What it means

P0600 means Serial Communication Link Malfunction.

Check these first

Damaged or shorted wiring between modules
Corroded or loose connector pins
Faulty network interface in a module
Electromagnetic interference on the bus
Failed module pulling the network down

What to do next

Scan all modules for communication and lost-communication codes
Check the shared data bus wiring for shorts or opens
Inspect network connectors for corrosion or bent pins
Isolate modules on the bus to find the one causing dropouts
Repair damaged wiring or replace the failing module

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Updated

Generic SAE J2012 definition. Last updated 2026-08-30.