P0600 Code: Serial Communication Link Malfunction
🟠 Moderate severity · drivable
Drivable, but the vehicle's modules aren't communicating properly, which can cause various electrical faults.
What P0600 means
The engine computer has lost communication with another control module over the vehicle's data network. It's a general communication fault rather than a specific component failure.
Symptoms
- Check engine light is on
- Multiple warning lights
- Intermittent electrical faults
- Possible limp mode
Common causes
- most common: Damaged or corroded wiring in the data network
- common: Loose module connector
- less common: Faulty control module
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Have the data network and module connections inspected | Mechanic | $100–300 |
| Repair damaged network wiring | Mechanic | $100–300 |
Frequently asked questions
Can I drive with a P0600 code?
Yes, but expect possible electrical quirks. Get the communication network diagnosed soon.
What is the most common cause of P0600?
Damaged or corroded wiring in the vehicle's data network.
How much does it cost to fix a P0600?
Diagnosis and wiring repair typically run $100–$300.
Related codes
P0601
P0601 Code: Internal Control Module Memory Check Sum Error
P0606P0606 Code: ECM/PCM Processor Fault
U0100U0100 Code: Lost Communication With ECM/PCM A
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.