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marco_krueger16

Corolla Overheating and Control Unit Error

I'm having trouble with my 2004 Toyota Corolla with a gasoline engine. The engine is overheating, the check engine light is on, and there's coolant leaking, suggesting high pressure. Diagnostics point to a control unit communication error, possibly a cable or plug issue. The car has 57791 km. Anyone else seen this?

Summary of the thread

A 2004 Toyota Corolla is experiencing engine overheating, a check engine light, and coolant leakage, indicating high pressure. Diagnostics suggest a control unit communication error, possibly due to a cable or plug issue. A similar issue was resolved by addressing a connectivity problem related to a software glitch in the control module. It is recommended to have a technician inspect and resolve the issue.

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4 comment(s)

selinaweiss3

Hey, I drive a Corolla too, and that overheating thing sounds familiar. Did the check engine light throw any codes? I had a similar issue where the engine was running hot, and it turned out to be a connectivity issue somewhere. Might be worth checking those connections you mentioned.

marco_krueger16 (community.author)

Could you give me more details about the connectivity issue you had? Do you remember any specific diagnostic trouble codes?

selinaweiss3

Sure thing. I can't remember the exact code, but it pointed to a data link problem. Honestly, I'm not super tech-savvy. The shop said something about a software glitch messing with the control module. Cost me about 95€ to get sorted. Probably best to get yours checked out.

marco_krueger16 (community.author)

Thanks for the help. That's really useful, and I'll get it checked by a technician soon. Hopefully, it's the same fix.

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TOYOTA

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COROLLA