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MOST COMMON PROBLEMS OF CHEVY SILVERADO HD / GMC 2020-2024 6.6L L5P DURAMAX

Common 2020-2024 Chevy Silverado HD / GMC 6.6L L5P Duramax Problems

The 2020-2024 Chevy Silverado HD and GMC Sierra HD models equipped with the 6.6L L5P Duramax engine are known for their power and towing capabilities. However, like any complex diesel engine, these models aren’t without their challenges. One issue that stands out in particular is the performance of the turbocharger, especially concerning boost leaks.

The most common 6.6l duramax l5p problems:

Turbocharger Performance and Boost Leaks

A critical component of the L5P Duramax engine is the turbocharger, which is responsible for forcing more air into the engine to improve combustion and overall performance. However, one of the most common problems reported by owners of the 2020-2024 models is related to boost leaks. A boost leak occurs when the pressurized air from the turbocharger escapes before it reaches the engine, which significantly reduces power output.

Symptoms of a boost leak can vary, but common signs include sluggish acceleration, a drop in power, and a noticeable whistling noise under load. The engine may also throw error codes, and you might experience reduced fuel efficiency as the engine works harder to compensate for the lost boost pressure. If left unresolved, boost leaks can lead to more severe turbocharger damage or even engine overheating.

2020-2024 6.6L L5P Duramax

To address this issue, it’s essential to inspect all turbo hoses, clamps, and intercooler connections regularly. Any signs of wear, tears, or looseness should be resolved immediately to prevent a drop in performance. Additionally, routine maintenance of the turbo system can help ensure it operates efficiently for the long term.

Turbo Shaft Play and Wastegate Issues

Another one of the Duramax LP5 problems is the turbocharger, the potential for turbo shaft play or wastegate problems. If the turbo develops too much play in the shaft, it can lead to oil leaks, increased wear on the internal components, and eventual turbo failure. Similarly, problems with the wastegate can cause over-boosting or under-boosting, both of which can harm engine performance and longevity.

Routine inspections of these components are crucial to catching issues early. Replacing worn parts before they fail can save you from costly repairs down the line.

Fixing Common Duramax Engine Problems
Why Choose ABCO Diesel for Your Turbocharger Repairs?

At ABCO Diesel Inc., we specialize in diagnosing and repairing issues with diesel engines like the 6.6L L5P Duramax. Whether you’re experiencing turbocharger boost leaks or other performance problems, our team of certified experts is here to help. With over 30 years of experience, we have the tools and knowledge to keep your truck running at its best.

Our shop, based in Orange, CA, offers everything from routine maintenance to complex repairs, ensuring your diesel engine remains reliable for years to come. We use only high-quality parts, and our team is committed to delivering transparent, top-notch service.

Don’t wait for a boost leak to worsen — visit ABCO Diesel today and experience the difference in quality and care. Your Duramax deserves the best, and we’re here to provide it.

l5p duramax problems

Some L5P Duramax problems—especially the 2020 Duramax problems—begin subtly. Sensor misreads, fuel pressure fluctuations, and DEF system glitches show up earlier than expected. And while GM made updates, the 2020 L5P Duramax still echoes a few concerns seen in the 2017 Duramax, particularly under commercial load. It’s not just wear—it’s accumulation. Keeping up with fuel system cleaning early helps slow that decline.