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Why an independent rear suspension for GM's new, full-sized SUVs wasn't easy

A Motor Trend report last month laid out how Cadillac's 4.2-lier twin-turbo Blackwing V8 could be an orphan due to cost concerns in the GM empire. Last-minute chassis changes to Cadillac's new sedans and XT6 crossover led to engine bays that couldn't fit the Blackwing. On the SUV side, according to the report, the new independent rear suspension for big people haulers cost so much to implement that GM ruled out reworking the Escalade to accept the Blackwing. At least one commenter rightly asked how could a suspension swallow that much money. A new piece in Motor Trend has the answer. The excellent Alissa Priddle spoke to Tim Herrick, GM's executive chief engineer for full-size trucks, about why the clean-sheet IRS cost "multimillions of dollars."  First, GM would need to build a new body shop at the Arlington, Texas plant that assembles the automaker's big SUVs to stamp the numerous wholly new parts and panels accommodating an IRS. Then GM would need to design and pay for a new assembly process. On top of those up-front costs, there was the incremental cost of the four-link IRS components being more expensive than those in the trucks' former leaf-sprung solid axles. Herrick endured so many rejections for so long that he remembers the date and time when he got approval for the new unit. He said it came down to a meeting where he told a higher-up, "I'll make you a deal: If we get to the reveal, or if we launch this and you think this was a dumb idea, I'll hand you my badge and let you walk me out." Head to Motor Trend to read the full story. Based on Herrick being on stage to help present the new SUVs to the press, and on our First Ride in the new Chevrolet Tahoe and Suburban at GM's Milford Proving Grounds, it appears this will have a happy ending for all involved. Furthermore, since Herrick worked on the T1 platform that supports the big SUVs as well as the light- and heavy-duty pickups, he understood the demands on the commercial side, too. That could be why when Roadshow asked Tim Asoklis, chief engineer of the Tahoe and Suburban, if the new IRS could endure life in the Chevrolet Silverado and GMC Sierra, Asoklis answered, "Oh, absolutely." Related Video:    

NHTSA investigating nearly 750,000 GM models over non-deploying airbags

Nearly 750,000 vehicles built by Chevrolet, GMC, and Cadillac are the subject of a National Highway Traffic Safety Administration (NHTSA) investigation due to non-deploying driver-side airbags. While the investigation is ongoing, the agency believes the issue is likely due to rust particles that form on the inflator's connection terminal interface. The list of nameplates included in the investigation includes Chevrolet's Silverado, Tahoe, and Suburban, GMC's Sierra, Yukon, and Yukon XL, plus Cadillac's Escalade, Escalade ESV, CT4, CT5, and XT4. All of the potentially affected vehicles are 2020 or 2021 models, according to a bulletin published on the NHTSA's website. Investigators launched the probe in April 2021 after 15 consumers reported airbag-related issues, including nine who said an airbag malfunction light appeared in the instrument cluster. More alarmingly, the NHTSA is aware of six accidents that caused significant damage to the car's front end yet didn't trigger the driver's airbag. It adds that there are no fatalities linked to the issue, but there are six crashes and eight injuries reportedly blamed on it. No evidence suggests this problem is related to the millions of potentially deadly Takata inflators recalled over the past few years. General Motors is aware of the defect. It sent a technical service bulletin (TSB) to its dealers in March 2021 to address the aforementioned warning light. The note explains the issue is due to "rust particles in the connection terminal interface of the driver's airbag inflator." The company hasn't issued a safety recall yet, however. Whether it will partially depends on the NHTSA's findings. It's currently looking into the scope and the severity of the problem, and it wants to understand its implications on driver safety. Investigators will decide whether General Motors needs to recall the 749,312 cars that are part of the probe when they close their investigation. General Motors has already spent a significant amount of money replacing defective airbag-related parts in its cars. In November 2020, it was ordered by the American government to recall nearly 6 million pickup trucks and SUVs equipped with potentially dangerous Takata airbag inflators. It repeatedly argued that testing proved the inflators were safe, and it petitioned the agency four times starting in 2016 to avoid a recall, which cost an estimated $1.2 billion (about a third of its net income in 2020).

GM, Ford, Toyota, Stellantis CEOs want EV tax credit cap lifted

For just over a decade now, the U.S. has had a federal tax credit worth up to $7,500 for buyers of electric cars and plug-in hybrids. The catch has been that, once 200,000 of them were claimed for a manufacturer, that credit would be phased out. Now, automakers are asking for this cap to be lifted across the board, specifically General Motors, Ford, Toyota and Stellantis. The request comes in the form of a joint letter to Congress (which you can read here), signed by the CEOs of each company. And the ask really is as simple as that. The automakers would like the cap lifted for all EV manufacturers, and instead have a sunset date for the tax credit put in place. Broadly speaking, they want it lifted because of concerns about rising costs from materials and supply chain issues, which can lead to higher prices and could discourage buyers from getting an EV. It would also put automakers back on an even playing field. GM reached its tax credit cap a few years ago, meaning that none of its EVs are eligible for the tax credit. So while it reaped the benefits early on, it now has something of a disadvantage to competitors with credits remaining, such as those that signed on to this letter. GM wouldn't be the only beneficiary. Tesla ran out of credits years ago, too. Nissan still has credits, but likely not for much longer, as InsideEVs reports around 190,000 Leafs have been sold in the U.S. as of April. So it will probably face a phase-out soon, just as the anticipated, and more expensive, Ariya is heading to market. Making this change would also seem like a good choice for continuing to stimulate EV sales, if that's what the government is looking to do. While EVs are now reaching parity in practicality and performance with gas-powered cars, having an additional financial incentive will surely keep them looking more attractive. And automakers can push EVs without fear of running out of credits early. Certainly some sorts of changes to the EV tax credit are likely. There are bills in the works focusing on cap changes as well as the amount of money available, and which vehicles are eligible. Credits up to $12,500 have been proposed, plus possible credits for used EV sales and restricting some credits to vehicles of certain price brackets. Of course, any changes will require some cooperation in a deeply divided Congress. Related Video: Government/Legal Green Chevrolet Chrysler Ford Toyota Electric EV tax credit