Every California smog check term and question, plainly defined
What should I know about Ram truck smog checks in California?
Ram 1500 gasoline trucks pass California smog reliably. Ram 2500 and 3500 with the Cummins 6.7L diesel are a frequent STAR station vehicle — intact DPF, EGR, and DEF systems are mandatory, and any aftermarket emissions delete is an automatic fail.
Ram 1500 with 5.7L HEMI: Multi-Displacement System (MDS) cylinder deactivation carries similar lifter-wear risk to GM AFM — misfire codes on high-mileage examples
Ram 1500 eTorque mild hybrid (2019+): OBD-II-only readiness protocol; mild hybrid does not change smog testing but battery system faults can affect monitor completion
Ram 2500/3500 Cummins 6.7L diesel: all DPF, EGR, and DEF components must be original equipment or CARB-compliant aftermarket — no performance deletes, no EGR block-off plates
Emissions-deleted Cummins trucks can have OEM equipment restored before smog testing — test+repair shops with diesel capability can perform this
Ram 2500/3500 ProMaster diesel: same DPF/EGR/DEF requirements; common fleet vehicle — fleet accounts with consolidated invoicing available
Aftermarket tuners (EFI Live, Autocal, EZ Lynk) are detectable via OBD-II scan and constitute a fail if they've altered emissions calibration
Per BAR diesel inspection criteria, CARB emissions device rules, and Cummins service documentation.