P0600 – Serial Communication Link Malfunction

System: ECM
Dashboard light: Check engine light (MIL)
Check-engine blink code: —
Applies to: Generic OBD-II meaning. Not every code is used by this car.
Description: Serial Communication Link Malfunction
Detection / symptoms: 1.Check engine light on 2.An inexperienced technician may begin by attempting to diagnose the affected system rather than the loss of communication. If the ECM is not… 3.ABS light illuminated, 4.Transmission light illuminated (vehicle may not shift properly), 5.Big drop in fuel economy, 6.Driveability problems may occur, such as stalling at an idle, rough running and poor acceleration, or
Possible causes: 1.Experience has proven that a poor connection or failed ECM driver is the root cause of this code. For the most part, the ECM acts as a ground to… 2.A loose or corroded connector is more likely than a frayed or broken wire between both devices. Poor grounds are another plausible cause. The ECM,… 3.The wiring harness or Can Bus may be defective and have a short to ground or an open wire
What to check: 1.Check all battery and ECM power and earth connections first 2.Read every stored code; an ECM fault is rare, wiring faults are common 3.Have a specialist confirm before replacing the ECM
Confidence: medium (generic OBD-II definition, not checked against the factory manual for this car)

Generic OBD-II meaning (obd-codes.com), not checked against this car's factory manual. Clear the code and test-drive to confirm it returns. Search all fault codes · Common problems · Warning lights