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MOST COMMON PROBLEMS OF CHEVY SILVERADO HD / GMC 2017-2019 6.6L L5P DURAMAX

2017-2019 Chevy Silverado HD 6.6L Duramax Issues

The 6.6L L5P Duramax engine, found in the 2017–2019 Chevrolet Silverado HD and GMC Sierra HD, offers significant performance and fuel efficiency improvements over its predecessors. However, many owners report issues that can affect reliability, with MAP sensor and fuel injector problems being among the most common. Despite its impressive towing power, these components can wear out and cause engine performance issues, such as rough idling or power loss.

If you’re experiencing these or other 2017-2019 Chevy Silverado HD 6.6L Duramax issues, seeking help from a qualified diesel mechanic can resolve them efficiently. Our truck repair shop specializes in Duramax diesel engine diagnostics and repairs. Whether it’s a faulty fuel injector, MAP sensor failure, or another issue, our team has the tools and expertise to fix the problem quickly.

Along with these specific L5P Duramax issues, DEF system failures, turbocharger malfunctions, and transmission overheating are common in the 2017–2019 Silverado HD and Sierra HD models. Regular maintenance and timely repairs are essential for preserving your engine’s performance. If you’re facing any of these concerns, visit our trusted repair shop, where our skilled diesel technicians will ensure your truck is back in optimal condition, helping you avoid costly repairs down the line.

MAP Sensor Failure: A Recurring Issue

One of the most common problems with the L5P Duramax is the failure of the MAP (Manifold Absolute Pressure) sensor. Located in the intake manifold, the MAP sensor sends air pressure and vacuum data to the ECU, helping regulate the fuel-to-air ratio. In the L5P Duramax, soot buildup often clogs the sensor, causing inaccurate readings or failure.

Symptoms include misfiring, stalling, or a lack of power. The check engine light may come on, and performance can suffer due to an incorrect air-fuel mixture. If not addressed, a bad MAP sensor can lead to long-term engine damage.

2017-2019 6.6L L5P Duramax
Fuel Injector Malfunction: The #4 Injector

While the fuel injectors were upgraded for the L5P, one recurring issue is with the #4 fuel injector, or more specifically, its connector. This problem can cause the vehicle to enter limp mode, severely restricting engine performance. When this happens, engine lights will illuminate, and you may experience symptoms like rough idling, shaking, or poor overall performance.

Many owners have found that it’s often the connector for the #4 injector, rather than the injector itself, causing the issue. The connector tends to degrade over time, leading to intermittent connection problems. Replacing the faulty connector with a gold-plated one or switching to an LBZ connector has proven to be a reliable solution.

Trust ABCO Diesel Inc. to Keep Your Duramax Running Strong

If you’re experiencing these common problems with your 2017-2019 Chevy Silverado HD or GMC Sierra HD, don’t wait for the issue to worsen. At ABCO Diesel Inc., our expert diesel mechanics have years of experience diagnosing and fixing Duramax-related issues. Whether you’re dealing with MAP sensor malfunctions, fuel injector repair, or other performance concerns, we ensure your truck gets back to peak performance quickly and efficiently. We specialize in handling the 2017-2019 Chevy Silverado HD 6.6L Duramax common problems and GMC 6.6L L5P Duramax diesel issues, using the latest tools and techniques to provide lasting solutions.

With over three decades of experience in diesel repair, ABCO Diesel is your trusted partner for all things diesel. We pride ourselves on delivering top-notch service, addressing everything from fuel system failures to turbocharger replacements and beyond. At our truck repair shop, we use advanced diagnostic tools to pinpoint and resolve issues efficiently. Visit us in Orange, CA, or contact us today to schedule an appointment. Trust our skilled technicians to keep your Duramax-powered truck running smoothly for years to come!

2018 duramax problems

Many owners say 2018 Duramax problems often appear around 30–50k miles—issues like rough idle or sensor-triggered derate. Forums highlight recurring L5P problems, including injector harness faults and MAP sensor errors. These malfunctions frequently stem from soot buildup in emissions systems and can lead to limp-mode alerts. ABCO, a professional auto repair and diesel engine repair company, recommends early attention to injectors and MAP sensors to help avoid bigger breakdowns.