⚠️ GMC overview
GMC sells premium trucks and SUVs in North America, including Sierra pickups with available Duramax diesel. Fuel contamination remediation follows GM Service Information; misfuel damage is not warranty-covered.
Service portal
GM Service Information (GMSI) / ACDelco TDS
Fuel system notes
- Sierra 1500/HD may be gasoline or diesel—read fuel door before dispensing.
- Canyon aligns with Colorado diesel/gas fuel procedures.
- DEF is never added to the diesel fuel tank.
Frequently asked questions
Is GMC Sierra fuel service the same as Chevrolet Silverado?
Sierra and Silverado are platform twins; GMSI procedures align for the same generation and powertrain.
What should I do after gasoline in a Duramax Sierra?
Do not start the engine. Tow to a certified facility for GM-method tank draining and fuel system inspection.
Need professional misfuel recovery?
Find a certified operator or read consumer guidance for your next steps.
Find an operator Consumer guidance