The LML and L5P Duramax have earned loyal fans and a long queue at GM service bays. When emissions faults, fuel system contamination, or DEF regen cycles repeat, Song-Beverly gives California buyers a direct route to a buyback or replacement.
General Motors builds the Duramax in partnership with Isuzu. The LML generation (2011-2016) and L5P (2017-present) have powered Chevy Silverado 2500/3500 HD and GMC Sierra 2500/3500 HD trucks. Both generations ship with emissions systems that have produced recurring California lemon law claims.
California's ARB Emissions Control Warranty requires 7-year or 70,000-mile coverage for many emissions components, and 15-year or 150,000-mile coverage for selected major components such as catalytic converters. Defects first reported within this extended period anchor Song-Beverly claims even after the 3/36 basic warranty has expired.
Silverado and Sierra 2500 HD configurations often land under 10,000 pounds GVWR, inside Civil Code 1793.22(e)(2) small-business coverage. Silverado/Sierra 3500 HD, especially DRW (dual rear wheel) and higher GVWR packages, typically exceed 10,000 pounds. Attorneys check the door jamb label and registration to confirm coverage pathway. Magnuson-Moss and CLRA claims remain available outside Song-Beverly.
That pattern is a Song-Beverly claim in Duramax form. Free case evaluation. GM pays attorney fees under Civil Code 1794(d).
Use the standard Civil Code 1793.2(d)(2)(B) formula. See our detailed calculator. Key considerations for HD trucks:
What if I bought the truck in Arizona but live in California?
Song-Beverly applies to consumer goods sold or leased in California. Out-of-state purchases require careful analysis; registration and use matter.
Are aftermarket tuners a disqualifier?
Potentially. Deleting emissions equipment is independently illegal under California and federal law, and supports manufacturer modification defenses.
Is my Allison transmission covered separately?
The Allison is under the GM powertrain warranty; shift quality and failure claims proceed under Song-Beverly like any other powertrain defect.
Free consultation. No fee unless we win. GM pays your attorney fees under Civil Code 1794(d).