If you own a 2017 or newer Chevrolet Silverado HD or GMC Sierra HD with an L5P Duramax engine, you know you’re driving one of the most powerful and advanced diesel engines ever produced by General Motors. The L5P Duramax represents the pinnacle of GM’s diesel technology, delivering an impressive 445 horsepower and 910 lb-ft of torque from its 6.6L V8 turbo-diesel design. At PSP Diesel & Automotive in South Houston, we specialize in L5P Duramax repair and maintenance, making us your trusted L5P Duramax shop serving Houston, South Houston, Katy, Deer Park, and throughout Harris County.
Why the L5P Duramax Stands Apart
Introduced in 2017, the L5P Duramax marked a significant leap forward in diesel engine technology. Unlike its predecessors, the L5P features a stronger block, improved emissions systems, and enhanced fuel injection technology. This engine powers 2017-present Chevrolet Silverado 2500HD, 3500HD, and GMC Sierra 2500HD, 3500HD models, delivering exceptional towing capacity and reliability. However, like any high-performance diesel engine, the L5P requires specialized knowledge and expert care to maintain its peak performance.
L5P Duramax Quick Facts:
- 6.6L V8 turbo-diesel engine
- 445 horsepower at 2,800 rpm
- 910 lb-ft of torque at 1,600 rpm
- Used in 2017-present Silverado HD and Sierra HD trucks
- Features advanced CP4.2 high-pressure fuel pump
- Improved emissions system with DEF (Diesel Exhaust Fluid)
Common L5P Duramax Repairs & Maintenance
At PSP Diesel & Automotive, we’ve developed deep expertise in L5P Duramax engines and understand the unique maintenance and repair needs of this advanced powerplant. Here are the most common services L5P owners need:
CP4.2 Fuel Pump Issues: The L5P uses a CP4.2 high-pressure fuel pump that can fail catastrophically, sending metal debris throughout the fuel system. We offer preventative solutions and complete fuel system repairs when pump failure occurs.
DEF System Service: The Diesel Exhaust Fluid system is critical for emissions compliance. We diagnose and repair DEF injector failures, heater issues, and quality sensor problems that can leave you stranded.
Emissions System Maintenance: DPF (Diesel Particulate Filter) regeneration issues, EGR cooler problems, and SCR catalyst concerns require specialized diagnostic equipment that we have on-site.
Turbocharger Service: The variable-geometry turbocharger in your L5P requires proper maintenance. We handle turbo replacements, actuator repairs, and boost leak diagnostics.
Transmission Service: The Allison 1000 transmission paired with your L5P needs regular maintenance. We provide transmission fluid changes, filter replacements, and complete transmission repairs.
Fuel Filter Changes: Regular fuel filter maintenance is critical for L5P longevity, especially given the sensitive CP4.2 fuel pump. We recommend fuel filter changes every 15,000-20,000 miles.
Injector Service: The L5P uses sophisticated piezo injectors. We diagnose and replace faulty injectors and perform injector balance rates testing.
Performance Upgrades: Whether you need custom tuning, upgraded intercoolers, or performance exhaust systems, we can help you safely increase your L5P’s capabilities.
Our L5P Duramax Expertise
What sets PSP Diesel & Automotive apart is our dedicated focus on modern Duramax engines, particularly the L5P platform. Our technicians receive ongoing training on the latest L5P diagnostic procedures and repair techniques. We invest in factory-level diagnostic equipment specifically designed for L5P engines, allowing us to accurately diagnose issues that generic scan tools simply can’t detect. From routine maintenance to complex repairs involving the fuel system, emissions components, or engine internals, we have the knowledge and experience to keep your L5P running at peak performance.
While we service all Duramax generations including the LML (2011-2016) and earlier models like the LMM, LBZ, and LLY, our primary focus has shifted to the L5P platform because we recognize this is where truck owners need the most specialized expertise. The L5P’s advanced technology requires more than a general diesel mechanic—it requires a shop that understands the intricacies of modern high-pressure common rail systems, complex emissions controls, and computer-controlled engine management.
Your Trusted L5P Duramax Shop in South Houston
When your L5P Duramax needs service, you deserve a shop that respects both you and your investment. At PSP Diesel & Automotive in South Houston, we take a dignified and transparent approach to every repair. We’ll clearly explain what your L5P needs, provide honest recommendations, and never suggest unnecessary services. Our goal is to build long-term relationships with L5P Duramax owners throughout the 77587 area and beyond by delivering exceptional service at fair prices.
Whether you’re experiencing a check engine light, loss of power, excessive exhaust smoke, fuel system concerns, or you simply need routine maintenance, bring your L5P Duramax to the specialists at PSP Diesel & Automotive. We understand these engines inside and out, and we’re committed to keeping your truck running strong for years to come.
Schedule Your L5P Duramax Service Today
Call us at 713-941-1135 or book online at our website
Serving South Houston, Houston, Katy, Deer Park, and all of Harris County
