Duramax Diesel Service

If you have a GM diesel medium or light-duty truck, you almost certainly have the Duramax diesel engine. It’s a V8 diesel that has been in production since 2001. Depending on the year and model, you could have one of six engine models. All of them need regular maintenance and repair. Your ASE Certified diesel mechanic at Ace Performance Automotive is trained in servicing and repairing GM’s Duramax diesel engines.

GM’s Duramax Engine Models

If you need to know the engine model of your Duramax engine, you can find it on the sticker under the hood or by decoding the VIN. The six engine models available through 2020 include:

  • LP5
  • LB7
  • LML
  • LLY
  • LBZ
  • LMM

As of early 2021, the LP5 has the highest horsepower rating in the light-duty trucks from any manufacturer.

Duramax Maintenance and Service

As with any other vehicle, the Duramax requires regular maintenance and service. Your owner’s manual will tell you how often you need to perform the required services to keep your truck in good running condition.

One of the benefits of having your Duramax diesel service and repair done at Ace Performance Automotive in Gilbert, AZ, is that we’ll do a complete check of the truck to see if it has any upcoming issues that you should be aware of. This particular service, while useful for everyone, is even more useful for fleet service vehicles.

While not every upcoming issue is visible, we can significantly reduce the risk of you getting stranded somewhere by letting you know about issues we can see.

Common maintenance services for your Duramax include:

  • Changing the oil and filter
  • Replacing the fuel filter
  • Flushing the cooling system
  • Flushing the transmission and doing a transmission service
  • Replacing the air filter
  • Replacing the external transmission filter
  • Replacing the differential fluid
  • Changing the oil in the transfer case
  • Flushing the brake system
  • Flushing the power steering system
  • Tuning up the engine where applicable
A Duramax logo with the words Allison Transmission to the left

Common Repairs for Trucks with Duramax Engines

As with any engine, the Duramax needs repairs for wear-and-tear items. Some of the more common repairs we see include:

  • Issues with injectors
  • Chafing wiring harness
  • Overheating
  • Bad fuel filter housing O-rings
  • Lift pump issues

Of course, you have the issues that are typical with any vehicle, including:

  • Brakes and rotors or drums
  • Brake hoses, calipers, and master cylinders
  • Alignments and tires
  • Steering and suspension issues
  • Alternators
  • Water pumps


Sometimes, your truck’s check engine light might come on. We have factory diagnostic equipment to help us determine why the light is on so that we can perform the proper repair the first time. We use OE and OEM parts and deliver quality work and excellent customer service with the quickest turnaround time possible.

Contact Ace Performance Automotive

If you need service for a personal vehicle, work vehicle, or you have a fleet of vehicles that require regular service, contact Ace Performance Automotive to schedule an appointment. If you have a repair and are being towed in, call us at 480-539-6872 as soon as possible to let us know the tow truck is coming. You can also stop in to schedule an appointment or use our online scheduling form.