Duramax Service Rohnert Park
Your Chevy or GMC Diesel, In Expert Hands
The Duramax has powered Chevrolet Silverado and GMC Sierra heavy-duty trucks since 2001, earning a reputation for strength and reliability. Each generation has its own quirks, and knowing them is the difference between a quick fix and a costly guessing game. Our technicians work on Duramax trucks every week and know these engines generation by generation.
Duramax Engines We Service
• LB7: 2001–2004
• LLY: 2004.5–2005
• LBZ: 2006–2007
• LMM: 2007.5–2010
• LML: 2011–2016
• L5P: 2017–present
• 3.0L Duramax (half-ton): 2019–present
Common Duramax Repairs
• Injector replacement (a well-known LB7 issue)
• Overheating and cooling system upgrades (LLY)
• CP4.2 fuel pump failure and conversion options (LML)
• DPF, DEF/SCR and EGR diagnosis and cleaning (LMM and newer)
• Turbocharger and vane control issues
• Glow plugs and cold-start problems
• Allison transmission service
• Head gaskets and engine rebuilds through our machine shop
Keep your Duramax pulling strong. Call 707-800-4115 or schedule online.
Frequently Asked Questions
How do I know which Duramax I have?
The 8th digit of your VIN identifies the engine. You can also tell us your model year and we’ll confirm it.
What’s the deal with the LML’s CP4 pump?
The CP4.2 high-pressure fuel pump on 2011–2016 trucks can fail and send metal debris through the fuel system, which can mean replacing injectors and lines too. Clean fuel and regular filter changes help. Some owners choose a conversion to a more durable pump design.
How often should I change the fuel filter?
Follow your owner’s manual, but many Duramax owners change it every other oil change or about every 15,000 to 30,000 miles. Water-in-fuel warnings should never be ignored.
Why is my Duramax regenerating so often?
Short trips and idling, a faulty differential pressure sensor, or excess soot from injector or EGR problems. We’ll find the root cause instead of just forcing a regen.
Do you service the Allison transmission?
Yes. Regular Allison fluid and filter service is one of the best ways to protect it, especially if you tow.
Can you do performance work on my Duramax?
We can recommend CARB-legal upgrades, and our dyno tuning shop can verify results on the dyno.