thomasknight4

Sonic preheating lamp issue

I'm having a heck of a time with my 2020 Chevy Sonic diesel. The preheating lamp just won't switch off, and the check engine light is on constantly! Plus, it's puffing out smoke when I accelerate. I've wiggled some wires around the preheating control unit, thinking maybe it's a loose connection, but no luck. Could a dodgy cable or plug really cause all this?

A 2020 Chevy Sonic diesel is experiencing issues with the preheating lamp not switching off, a constant check engine light, and smoke during acceleration. The problem may be due to a defective plug connection on the preheating control unit. After taking the car to a shop, the issue was resolved by fixing the faulty connection.

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4 comment(s)

Whoa, sounds familiar! I had something similar happen with my Sonic. Is it possible the heating module is on the fritz? Those things can cause all sorts of weird electrical gremlins.

Heating module, huh? Where exactly is that located, and is it something I can check myself before taking it to a shop?

Yeah, the heating module. Honestly, I'm not super sure where it is exactly on the Sonic – I just know that's what the shop told me was causing the issue. If you're not comfortable poking around too much, it might be worth getting a pro to take a look. Electrical faults can be tricky.

Thanks a bunch for the heads up! I took it to the shop, and you were spot on – turns out it was a defective plug connection on the preheating control unit. 95€ later and it's sorted!

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CHEVROLET

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SONIC