karl_zimmermann91

Highlander engine power loss

My 2021 Toyota Highlander with a gasoline engine is giving me fits. It's got 170414 km on the clock. Recently, I've noticed a significant reduction in engine power, and the check engine light is on. I scanned the error memory and it's throwing a code related to the engine control unit. I'm suspecting it could be a defective main relay. Has anyone experienced something similar with their Highlander?

A 2021 Toyota Highlander experienced significant engine power loss and a check engine light, with an error code pointing to the engine control unit. The suspected cause was a defective main relay. After consulting with others who had similar issues, the problem was confirmed and resolved by replacing the faulty main relay at a workshop.

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4 comment(s)

I had something similar happen on my Toyota as well. I didn't have the gasoline engine but the same problem. Have you tried resetting the system or checking the relay itself?

I tried resetting the system but no luck. How did you end up resolving the problem? Was it indeed the main relay, and if so, how did you confirm that?

Yeah, it was the main relay. Given the error and symptoms, I didn't want to risk further damage. Took it to a trusted workshop. They confirmed the relay was faulty and replaced it. Best to get it checked professionally before things get worse.

Thanks for the insight. I took it to the workshop, and you were spot on – the main relay was defective. They replaced it for 120€. Appreciate the help!

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TOYOTA

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HIGHLANDER