GM Active Fuel Management (AFM) Smog Issues
AFM is GM's cylinder-deactivation technology on V8 trucks/SUVs (Silverado, Tahoe, Suburban, Escalade). Known issue: lifter failure causing misfire codes (P0300-P0308) — can prevent smog passage. Common on 2007-2014 5.3L V8s. Fix: lifter replacement OR AFM delete kit (must use CARB-approved version for CA).
Common AFM (Active Fuel Management) smog issues
Lifter failure on deactivating cylinders, oil consumption from ring wear
How to fix
Lifter replacement (~$1,500-3,500), or CARB-approved AFM delete (rare)
Typical repair cost
$1,500-$3,500 for lifter repair
Common questions
What is AFM (Active Fuel Management)?
AFM is GM's cylinder-deactivation technology on V8 trucks/SUVs (Silverado, Tahoe, Suburban, Escalade). Known issue: lifter failure causing misfire codes (P0300-P0308) — can prevent smog passage. Common on 2007-2014 5.3L V8s. Fix: lifter replacement OR AFM delete kit (must use CARB-approved version for CA).
What causes a AFM (Active Fuel Management) smog failure?
Lifter failure on deactivating cylinders, oil consumption from ring wear
How is AFM (Active Fuel Management) fixed?
Lifter replacement (~$1,500-3,500), or CARB-approved AFM delete (rare)
What does fixing cost?
$1,500-$3,500 for lifter repair