P0600 — Serial Communication Link Malfunction
Category: Powertrain Severity: High
Updated:
DTC code P0600 means: Serial Communication Link Malfunction. It falls under the "Powertrain" category, with an estimated severity of High. Common causes include communication fault between modules (CAN bus), faulty ECU ground or power and corroded ECU connector; it's worth confirming the diagnosis before replacing parts.
Possible causes
- Communication fault between modules (CAN bus)
- Faulty ECU ground or power
- Corroded ECU connector
- Failed engine control module
Symptoms
- Multiple warning lights
- Limp mode
- Erratic shifting
- Engine may not start
How to diagnose it step by step
- Measure battery voltage.
- Check engine and chassis grounds.
- Scan all modules for U codes.
- Inspect module connectors.
- Check the CAN bus (60 ohms between CAN-H and CAN-L).
How to fix it
Check the battery, engine grounds and module connectors. Look for other U codes that show which module is losing communication.
Estimated repair cost
From $0 (loose ground) to $500–1,500 (ECU).
Frequently asked questions
What does DTC code P0600 mean?
Serial Communication Link Malfunction.
Is code P0600 serious?
Severity High. Have it checked as soon as possible, especially if it affects safety or the catalytic converter.
Can I keep driving with code P0600?
Carefully, and only if the car behaves normally.
Related codes
P0601 P0602 P0603 P0604 P0605 P0606 P0615 P0620 P0627 P0641
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