norberthunter43

DMax Boost Pressure Actuator Fault

Hey, I'm having trouble with my 2019 Chevrolet DMax diesel. At 210992 km, I've got a boost pressure actuator fault. The check engine light is on, power is down, and the engine response is slow. There's also a whistling noise that turns into a loud hissing when I accelerate. Sometimes it stalls at idle, and fuel consumption is up. Diagnostics point to a bad electrical bypass valve in the turbo system. Any ideas?

The 2019 Chevrolet DMax diesel experienced a boost pressure actuator fault, resulting in a check engine light, reduced power, slow engine response, and increased fuel consumption. Diagnostics indicated a faulty electrical bypass valve in the turbo system. The suggested solution was to inspect the actuator and vacuum lines for leaks or restrictions. Ultimately, replacing the defective electrical bypass valve resolved the issue, restoring the vehicle's performance.

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4 comment(s)

I had a similar experience with my 2016 Audi A4. Same symptoms: check engine light, power loss, weird noises. Was your actuator arm moving freely when you checked? Did you inspect the vacuum lines for leaks or cracks?

Thanks for the quick reply. The actuator arm seemed a bit restricted, but not stuck. I gave the vacuum lines a quick look but didn't see anything obvious. Where were the vacuum lines most likely to fail in your case?

For me, the small lines connecting to the solenoid valve were brittle and cracked, causing a leak. Given the symptoms and the restricted actuator movement you describe, it strongly suggests a faulty actuator or related component. With that mileage, I'd advise a proper inspection at a reputable workshop.

Thanks for the advice. I took my DMax to a workshop, and they confirmed a defective electrical bypass valve, which they replaced. The repair, including the valve and labor, cost 250€. It's running like it should now. Thanks again for your help.

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CHEVROLET

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DMAX