During the Heavy-Duty Shootout comparison test organized by the experts, the Silverado experienced glitches with the hill-hold assist feature. Bluntly put, the system failed to engage on a 7.2 percent grade, sending the truck slipping on the slope.
Apparently, this was not the result of the driver's error, but a glitch with the system. GM looked into the matter and found the cause to be an incorrect calibration of the system’s software. According to pickuptrucks.com, the error was quickly fixed and eliminated from production starting this Monday.
As for the vehicles already sold, it would appear GM has not made any decision to recall them yet. The fix to the problem has however been sent to dealers to be applied to the trucks still in stock.
"It’s astounding [GM found and fixed the issue so quickly]," Jim Hossack, AutoPacific vice president said according to the source. “I think it’s the new GM and technology that wasn’t there a few years ago. It's another feather in GM's cap.”
The 2011 Silverado HD hit dealerships this May, packing a 6.0l Vortec 6L90 gasoline power unit (97 hp at 3,000 rpm and 765 lb.-ft. of torque at 1,600 rpm) and a 6.6l Duramax diesel as an option. The truck is equipped with independent and new asymmetrical leaf-spring rear suspensions, exclusive exhaust brake system, larger brakes making for improved handling and steering.
As you already know, the hill-hold assist system is meant to detect when the vehicle is on an incline and prevent it from slipping.
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