Home Auto Repair How to Fix the Duramax LLY Injector Harness

How to Fix the Duramax LLY Injector Harness


Performing your own maintenance can save you money. The Duramax is a family of large diesel engines manufactured by General Motors. Like all engines, Duramax engines rely on a functioning fuel system to fire. The fuel injector is an essential component of the fuel system. It helps maintain the flow of fuel to the engine. A common issue with fuel injectors is the wiring harness has corroded, which can lead to a fuel leak. Check the fuel injector harness, which secures the fuel line to the fuel injector. When a fuel injector goes bad, you may notice some starting problems with your vehicle.


  • Park your vehicle in a safe location on level ground. Engage the parking brake and turn off the ignition. Open the hood.
  • Locate the fuse box in the hood area along the passenger’s side. Open the fuse box. Remove the fuel pump fuse from the fuse box to relieve the pressure in the fuel system. Disconnect the negative cable from the battery.