Two problems related to check engine light on have been reported for the 2009 Toyota Matrix. The most recently reported issues are listed below.
2009 Toyota Matrix first problem started stalling suddenly in traffic last year, but now very frequently stalls even on highways at high speeds. No warnings. When stalled all lights comes on in dash, including "check engine" light. Completely turn off ignition and restarting is the only way to fix this issue at that time. After restarting the check engine light goes out. Occurred several times in all sorts of weather, but more frequently in hot summer days. Yesterday stalled 4 times within 90 minutes drive. Restart cleared engine computer dealership had difficult time replicating failure. But, advised replacement of the engine control module at a cost of over $1000. Since this year model not recalled by Toyota yet. I do not know how or where to complain so that Toyota acknowledge that it is a safety issue and fix this at their expense.
The contact owns a 2009 Toyota Matrix. While driving approximately 55 mph, the check engine warning light illuminated and the vehicle's speed decreased to 10 mph independently. The failure recurred multiple times. The vehicle was taken to a dealer for diagnostic testing. The mechanic stated that the engine needed to be replaced. The vehicle was not repaired. The VIN was unavailable. The manufacturer was notified of the failure. The approximate failure mileage was 125,000.