EPA Proposes Ending Limp-Mode for DEF Failures in Diesel Trucks
TL;DR Summary
The EPA proposes removing derates and limp-mode triggers tied to DEF failures for newly built diesel engines, aiming to cut costs and boost productivity while preserving about 90% of NOx reductions. If finalized, the rule would apply to 2027-model-year vehicles with a 45-day public comment period, and older trucks would still derate; the plan also eases warranty requirements and relies on warnings rather than immediate shutdowns.
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