Network / CANCritical⚠️ Professional Recommended

P0600

Q: What does OBD2 code P0600 mean?

P0600 means: Serial Communication Link Circuit. The ECM has detected a fault on the serial data communication link (typically the internal ECM communication bus) used to share data between internal ECM processors or with other modules.

Serial Communication Link Circuit

The ECM has detected a fault on the serial data communication link (typically the internal ECM communication bus) used to share data between internal ECM processors or with other modules.

SeverityCritical

CategoryNetwork / CAN

Est. Repair Cost$300–$1500

Code TypePowertrain

DIY RepairProfessional

⚡ Common Causes

›Failed ECM
›Wiring fault on CAN bus
›Damaged communication harness
›Corroded ground connection

⚠️ Symptoms

›Multiple system faults
›Modules not communicating
›Possible no-start

✅ How to Fix — Step by Step

Step 1:Check battery and grounds
Step 2:Inspect CAN bus wiring
Step 3:Test ECM power and ground
Step 4:Replace ECM if confirmed failed

🔧 Diagnostic Tools Required

✔OBD-II Diagnostic Scanner
✔CAN Bus Tester
✔Digital Multimeter
✔Oscilloscope

Using the correct diagnostic tools helps identify the root cause of P0600 before replacing parts unnecessarily. Always confirm the fault using live data and manufacturer-recommended diagnostic procedures.

💡 Pro Tip: This code often points to a marginal ECM ground or internal ECM fault — verify all ECM grounds are clean and tight before considering ECM replacement.

Frequently Asked Questions

What does OBD2 code P0600 mean?+

P0600 stands for Serial Communication Link Circuit. The ECM has detected a fault on the serial data communication link (typically the internal ECM communication bus) used to share data between internal ECM processors or with other modules.

What causes code P0600?+

Failed ECM; Wiring fault on CAN bus; Damaged communication harness; Corroded ground connection

How do I fix code P0600?+

Check battery and grounds; Inspect CAN bus wiring; Test ECM power and ground; Replace ECM if confirmed failed

How much does it cost to fix P0600?+

Estimated repair cost for P0600 is $300–$1500.

Is P0600 DIY-friendly?+

P0600 typically requires professional equipment and a qualified mechanic.