2017–2024 GMC Sierra 2500HD 6.6L Duramax Diesel Repair
Sierra 2500HD trucks of 2017–2024 with the diesel use the L5P Duramax. Gas V8 trucks share these years, so we confirm by VIN.
At a glance
How to confirm your engine
- The 8th VIN digit identifies the Duramax generation (L5P).
- The RPO sticker in the glove box lists the engine code.
Common failure areas on the Sierra 2500HD
Emissions sensors and DEF system are the most common service items.
Turbo, sensor or fuel supply faults.
Diagnostic considerations
- Confirm engine code by VIN
- Injector balance rates
- Rail pressure and supply checks
Related repair services
Diagnosing fuel, emissions, turbo and cooling faults across Duramax generations (LB7 to L5P).
Radiator, water pump, fan clutch and EGR cooler repair for the Duramax in Arizona heat.
Lawful diagnosis and repair of DPF (LMM onward), DEF/SCR (LML onward), EGR and NOx sensors.
Turbo diagnosis for fixed-geometry LB7 and variable-geometry later Duramax engines.
Other Sierra 2500HD generations with the 6.6L Duramax
Closely related trucks
Overlapping years with a different diesel, or the same engine in a sister truck — these are separate configurations, not your exact truck.
Request a quote for your GMC Sierra 2500HD
Frequently asked questions
How do I know my Sierra 2500HD has the 6.6L Duramax L5P?
The 8th VIN digit identifies the Duramax generation (L5P). The RPO sticker in the glove box lists the engine code.
Do you delete DPF or EGR systems?
No. We diagnose and repair emissions systems to their factory function. We do not perform deletes or install defeat devices.
Can you quote a price over the phone?
We diagnose before quoting because diesel repair scope varies widely. Call 602-725-6800 or request a quote to get started.