P0600 — Serial Communication Link
Moderate severityWhat it means
P0600 is stored when the engine control unit sees a fault involving the serial communication (data bus) link. Modules in the car talk to each other over a serial data bus; this code means a module lost communication on that network. The fault points to the module's internal operation or its power, ground and network connections rather than a single external sensor.
Common symptoms
- Multiple unrelated warning lights
- Modules that won't respond to the scanner
- Intermittent electrical faults
Likely causes
- Low voltage, poor ground or a corroded connector at the module
- Damaged bus wiring or connector
- A failed module dragging down the network
What to check first
- Verify module power, grounds and battery voltage before suspecting the module itself
- Check power and grounds to the affected modules
- Inspect bus wiring for damage and isolate modules to find the faulty one
Can you keep driving?
Communication faults can be intermittent and affect safety systems; have it checked before relying on the car.
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All information, explanations and guidance on this page are general preliminary information only. They are estimates and may be entirely wrong, incomplete or inaccurate, or may not apply to your vehicle at all. Never take any action based on this content alone — do not decide to keep driving, clear codes, replace parts, repair or otherwise work on your vehicle based only on what you read here. In every case, and for any final decision, you must consult qualified technical personnel (a professional mechanic, an authorized service centre or an engineer) and obtain their approval before acting. MechanicAI accepts no liability or responsibility whatsoever for any damage, fault, injury, loss or outcome that may arise — directly or indirectly — from using or relying on this information, for any reason and under any circumstances. By using this page you acknowledge and accept these terms.