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Engine block heater issues force GM to recall 324,226 diesel heavy duty trucks

General Motors has issued a recall on 324,226 diesel heavy duty trucks that could be susceptible to short circuits, and consequently, potential fire. The recall affects several models of heavy duty Chevrolet Silverados and GMC Sierras with optional engine block heaters. GM is recalling seven different truck models spread across three years. The recall affects the 2017-2019 Chevrolet Silverado 2500HD, 2017-2019 Silverado 3500HD, 2019 Silverado 4500HD, 2019 Silverado 5500HD, and 2019 Silverado 6500HD, plus the 2017-2019 GMC Sierra 2500HD and 2017-2019 Sierra 3500HD. Specifically, it includes these models with the 6.6-liter Duramax diesel engines and the optional engine block heater. The recall technically deals not with the engine block heater itself, but the way it is connected. According to NHTSA campaign No. 19V328000, the engine block heater cord or the terminals that link the cord to the heater could short circuit. A short circuit could potentially damage engine components and result in a fire. According to The Detroit News, 19 fires have been reported but nobody has been injured. GM has yet to figure out a fix, and thus has not yet released a notification schedule for affected customers. If you believe your vehicle is part of the recall, contact GM customer service at 1-586-596-1733 and use reference number N182206310.

GM plans to restart production in Mexico on May 20

MEXICO CITY — General Motors is tentatively planning to restart operations at its auto assembly plant in the Mexican city of Silao on May 20, according to a message to workers seen by Reuters on Sunday, as the car industry prepares to exit the coronavirus lockdown. Separately, the president of GM's Mexican unit advised suppliers to prepare to resume operations. “We are now beginning a new phase given the Mexican governmentÂ’s official announcement earlier this week to consider the transportation manufacturing industry as essential for the countryÂ’s economy,” Francisco Garza, president ofGeneral Motors de Mexico, wrote in an email to suppliers dated on Friday that was viewed by Reuters. The reopening of the plant  in Silao would be a positive signal for the auto sector in North America, whose supply lines are highly interconnected between the United States, Mexico and Canada. The plant in the central state of Guanajuato has been idled for weeks due to the coronavirus outbreak. Workers had previously been told to plan to return to their jobs on May 18. A GM spokeswoman said the company could not confirm when it would restart operations at any of its facilities in Mexico because it is awaiting more guidance from the government. The message to the plant's workers came after the government on Friday clarified when the industry could begin easing restrictions imposed because of the health emergency. On Wednesday, the government said automakers could start going back into production from May 18. It then withdrew that advice and suggested the new start date would be June 1. Finally it indicated the sector, which forms the backbone of Mexican manufacturing, could begin operating as soon as next week if companies had the required safety measures in place. U.S. officials and its auto industry have pressed Mexico's government to get its factories open again because American operations depend heavily on parts from south of the border. However, some politicians are wary of opening too fast. Mexico registered its first case of coronavirus weeks after the United States and Canada and the toll of daily infections and deaths in the country reached new peaks over the past few days. The Silao production facility, which makes highly profitable pickup trucks for GM, is one of the biggest automotive plants in Guanajuato, a major Mexican carmaking state. Related Video:

'Killing a Duramax' Gale Banks YouTube series methodically tunes a diesel to death

Learning or perfecting a skill by watching YouTube videos is known as attending YouTube University. GM Authority picked up on one of the video site's more fascinating courses, hosted by Gale Banks; in a fair world, he should be referred to as Professor Banks when it comes to diesel engines and truck tuning. A few months after GM introduced the updated L5P 6.6-liter Duramax diesel V8 in the 2020 Chevrolet Silverado HD and GMC Sierra HD that ships with 454 horsepower and 910 pound-feet of torque, Banks decided he wanted to methodically tune the engine to death. The purpose of the resulting series, called "Killing a Duramax," is to push more power out of the engine in order to discover which parts break and when — or, as Banks puts it, force-feed the Duramax "until the crank hits the street and the heads hit the hood." With that knowledge, Banks can figure out all the weak points on his way to building what he calls a "Superturbo," that being a supercharged, twin-turbo race engine with more than 1,000 hp. What makes the series fascinating is Banks' knowledge, paired with the company's comprehensive iDash engine monitoring system that keeps tabs on a glut of parameters every step of the way. So for instance, you get Banks explaining the differences between inches of mercury and barometric pressure, how those are different from the water content of the air measured in grains, then showing those readouts on the iDash, then explaining in detail how they affect the air density in the Duramax system. The stock Borg-Warner variable turbo gets a lot of airtime — Banks accuses it of being "out to lunch" because he feels it's the weakest link on the engine. That turns into a turbo teardown and a deep explanation of performance pitfalls, such as when air pressure on the turbine begins to diverge from the boost pressure coming from the compressor. Banks says he can keep close tabs on where power's coming from, because the iDash monitors the horsepower contribution provided by the ambient air, the turbo, and the intercooler separately. The major changes so far are a stouter Precision 7675 turbo and TurboSmart wastegate (episode 5), a twin intake (episode 6), a custom liquid-cooled intercooler from a marine engine, a new GM oil cooler and synthetic oil (episode 10), and new injectors (episode 11).