Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
DTC P0600 - Serial Communication Link Malfunction
Turn ignition to OFF. Disconnect connector from ECM. Measure resistance of harness between ECM connector B84, terminal No. 41 and data link connector B40, terminal No. 10. If resistance is more than 10 ohms, repair open in harness between ECM connector and data link connector. If resistance is 10 ohms or less, measure resistance between ECM harness connector B84, terminal No. 41 and ground. If resistance is 10 ohms or less, repair short in harness between ECM connector and data link connector. If resistance is more than 10 ohms, repair contact in ECM connector and data link connector.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.