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lisa_knight6

Fortuner Overheating and Coolant Spill

My 2012 Toyota Fortuner diesel is overheating, the check engine light is on, and I'm seeing coolant spills. It's got about 188622 km on the clock. Could this be a control unit communication error?

Summary of the thread

A 2012 Toyota Fortuner diesel was experiencing overheating, a check engine light, and coolant spills. The issue was suspected to be a control unit communication error, potentially caused by a CAN bus issue or faulty sensor. After scanning, a generic control module communication error was identified, and it was suggested that a defective cable or plug connection could be the cause. The problem was resolved by replacing a corroded connector on a sensor, which fixed the issues.

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4 comment(s)

davidfrank2

Sounds like a potential CAN bus issue or a faulty sensor sending incorrect data to the ECU. Have you scanned for any diagnostic trouble codes (DTCs)? A connectivity issue might trigger those symptoms.

lisa_knight6 (community.author)

I scanned it and got a code related to a generic control module communication error. Could a defective cable or plug connection really cause all these problems, like the overheating and coolant spill?

davidfrank2

Yes, a defective cable or plug connection on a critical sensor can absolutely wreak havoc, leading to misreporting and cascading failures. Best to get the wiring and connectors checked out thoroughly, or head to a workshop.

lisa_knight6 (community.author)

I took it to the shop, and it turned out to be a corroded connector on one of the sensors, just like you suspected. New connector and cleaning fixed it, total cost 95€.

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TOYOTA

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FORTUNER