janheld6

Monza ECU Main Relay Defective

Experiencing a frustrating issue with my 2020 Chevrolet Monza, gasoline engine, at 82232 km. The engine control unit seems defective. Primary symptoms are reduced engine power, and I'm consistently getting an error stored in the error memory. Diagnostics point towards the main relay being defective, impacting the ECU's functionality. I've checked basic wiring and connections, but the problem persists. Anyone have experience with Monza control system issues?

A 2020 Chevrolet Monza is experiencing reduced engine power and error codes, suggesting a defective engine control unit (ECU). Diagnostics indicate the main relay is faulty, affecting the ECU's performance. Despite checking wiring and connections, the issue persists. A workshop confirmed the main relay defect, resolving the problem.

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4 comment(s)

Sounds familiar! I had a similar problem with my old Opel Corsa. Reduced power and constant error codes. Have you checked the relay itself? Sometimes it's an easy fix.

Thanks for the quick reply! Yes, I've visually inspected the relay. It looks fine, no visible damage or corrosion. Did you measure the voltage?

No voltage measurement for me, just a quick swap with another relay from the car. Didn't work. In the end, I had to take it to the workshop. They sorted it out pretty quick.

Appreciate the insight! I'll probably do the same. The workshop confirmed the main relay was indeed defective, leading to ECU issues. Repair cost me 120€. Thanks for pointing me in the right direction!

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CHEVROLET

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MONZA