TorqueMech OBD Code Guide
P0600 - Serial Communication Link Malfunction
A communication error occurred on the vehicle network.
Code first. Confirm symptoms and checks before pricing parts.
Read code pattern
Check likely system
Estimate after confirmation
Common Next Steps
Turn the code into the next check.
Test charging voltage
Measure alternator output and battery voltage under load.
Inspect serpentine belt
Check belt condition, tensioner travel, and pulley alignment.
Verify battery condition
Charge and load test before blaming the alternator or starter.
Related Inspection
Code Overview
A communication error occurred on the vehicle network.
Common Causes
- Wiring/connectors issue
- Module communication fault
- Low system voltage
Diagnostic Steps
- Check battery/charging system
- Scan for multiple module codes
- Inspect network wiring/connectors
Related OBD Codes
Browse nearby codes when systems overlap.
Next Steps
Move from code to checks, then estimate.