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luisaschroeder2

Tahoe diesel engine power loss

I'm having a weird issue with my 2023 Chevrolet Tahoe with the diesel engine. The check engine light keeps coming on, and the engine power seems noticeably reduced. It's also got pretty poor engine response, and I swear I'm burning through fuel faster than usual. I've only got 35317 km on it. I'm thinking it might be the manifold pressure sensor, maybe a vacuum leak somewhere? Any ideas?

Summary of the thread

A 2023 Chevrolet Tahoe with a diesel engine is experiencing power loss, poor engine response, and increased fuel consumption, accompanied by a check engine light. The suspected causes include a faulty manifold pressure sensor or a vacuum leak. After professional inspection, a large vacuum leak was identified as the root cause, leading to a faulty manifold pressure sensor. Replacing the sensor resolved the issue, restoring the vehicle's performance.

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4 comment(s)

william_drache6

Sounds familiar. I had similar symptoms on my old Volvo a while back. Turned out to be a faulty MAP sensor. Have you checked for any obvious vacuum leaks?

luisaschroeder2 (community.author)

Yeah, I took a quick look but didn't see anything obvious. Where should I be focusing my search for vacuum leakage? Any specific hoses or areas that are prone to failure?

william_drache6

On my Volvo, it was a small hose near the intake manifold that had cracked. Honestly, though, with those symptoms and a possible manifold sensor issue, it might be worth getting it checked by a professional. Save yourself the headache.

luisaschroeder2 (community.author)

Thanks, I appreciate the advice. I took it to the shop, and you were right! It was a large vacuum leakage that caused the faulty manifold pressure sensor. They replaced the sensor, and the total came to 235€. Runs like new now!

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CHEVROLET

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TAHOE