GM Authority

EPA To Investigate Diesel Engine DEF System Failures

The EPA is escalating its response to consumer complaints regarding DEF system failures, announcing a new investigation aimed ...
WCBD

Common Diesel DEF Problems and How to Solve Them

HOLLY, Mich., April 16, 2025 (GLOBE NEWSWIRE) -- A diesel truck, car or SUV that is losing power and fuel economy, shutting down unexpectedly, and/or has a DEF warning light illuminated is probably ...
Dairy Herd

More DEF Relief? EPA Takes New Action for Farmers and Truckers

Following Monday’s right-to-repair announcement, EPA is demanding DEF failure data from engine makers, targeting shutdowns ...
CCJ

EPA asks truck OEMs to end 5 mph engine derate for aftertreatment woes

U.S. Environmental Protection Agency (EPA) Administrator Lee Zeldin on Tuesday urged engine and equipment manufacturers to revise system software to prevent sudden loss of power from engine derates ...
Overdrive

EPA announces end to 5-mph DEF derates for new and existing trucks

The Environmental Protection Agency on Tuesday announced a "fix" to "protect American farmers, truckers, and other diesel equipment operators from sudden speed and power losses caused by diesel ...
GM Authority

Pouring DEF Into A GM Duramax Truck Diesel Tank Can Be A Costly Mistake: Video

Most diesel truck owners understand how to put diesel exhaust fluid (DEF) in their trucks. However, some make the mistake of getting DEF in their fuel tank instead of the dedicated DEF tank. As the ...