johannalight4

Sonic diesel DPF exhaust pressure too low

I'm having trouble with my 2019 Chevrolet Sonic, diesel engine. The warning light popped up, and I've noticed a serious drop in engine power. It's smoking a lot when I accelerate, and there's a strong exhaust smell. I scanned the OBD and it shows "Diesel particulate filter exhaust pressure too low". I'm thinking it might be the exhaust back pressure sensor. Anyone else run into this?

A 2019 Chevrolet Sonic with a diesel engine experienced a warning light, reduced engine power, excessive smoke, and a strong exhaust smell. The OBD scan indicated "Diesel particulate filter exhaust pressure too low," suggesting a potential issue with the exhaust back pressure sensor. The problem was resolved by replacing the defective sensor and performing a forced DPF regeneration, restoring the vehicle's performance.

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4 comment(s)

That sounds rough! I had a similar thing happen with my old Citroen C4 Picasso a few years back. Kept getting weird DPF warnings and eventually it felt like it was running on three cylinders. Was the DPF regeneration working properly before all this started?

To be honest, I'm not sure if the DPF regeneration was working right. I never really paid attention to it. How can I tell if it was working or not before this low pressure problem?

Yeah, that was my problem too, I never paid attention to regeneration cycles. Then things went south very quickly. I'd take it to a workshop if I were you. It could be a blocked DPF and in any case without the correct diagnostic tools it is difficult to say.

Thanks for the advice! I took it to the workshop, and you were spot on. Turned out the exhaust back pressure sensor was defective. New sensor installed and they ran a forced DPF regeneration. Total cost 245€. Now it's running like new again!

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CHEVROLET

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SONIC