P0600: Serial Communication Link Malfunction
Modules inside or connected to the engine computer aren't communicating properly.
Green, yellow, red: three ways P0600 can look
The same code can be a quick fix or a reason to pull over. Match your situation to the closest example.
Keep an eye on it
Set once after a jump start.
Schedule a repair
Several warning lights. Diagnose soon.
Stop and get help
Stalling or no-start. Get it diagnosed before driving.
Symptoms you might notice
- Various warning lights
- Odd shifting or gauges
Common causes, cheapest first
- Low battery voltage
- Damaged network wiring
- Engine computer problem
What you can check before calling
- Check battery and grounds
A code points to a system, not a part. Replacing parts based on the code alone is how people spend money without fixing the problem. Testing confirms the cause first.
Generic codes (second character 0) mean the same thing on every vehicle. Some manufacturers add their own details, so check service information for your exact vehicle.
Related codes
More network & modules codes
Look up another code
Cummins fault code (like 1922), J1939 SPN and FMI (like SPN 3251 FMI 0), or an OBD-II code (like P0420).
Questions
What does P0600 mean?
P0600 means "Serial Communication Link Malfunction". Modules inside or connected to the engine computer aren't communicating properly.
Can I drive with code P0600?
It depends on what the vehicle is doing. Green: Set once after a jump start. Yellow: Several warning lights. Diagnose soon. Red: Stalling or no-start. Get it diagnosed before driving.
What causes P0600?
The most common causes are: low battery voltage; damaged network wiring; engine computer problem.
Is P0600 a serious code?
It can be. Stalling or no-start. Get it diagnosed before driving.
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