02/22/2026
The 2001–2004 Duramax LB7 is known for injector failures caused by internal body cracks — a design issue that affects nearly every LB7 at some point. Learn what the replacement process involves, realistic cost expectations ($3,000–$5,000+), how to diagnose which injectors are failing, and why remanufactured Bosch injectors are the smart choice.
