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GM exploring ways to raise half-ton Duramax diesel tow rating

Lots of truck owners cheered when GM announced fuel economy numbers for the 2020 Chevrolet Silverado with the 3.0-liter Duramax diesel inline-six. Even after Ram let loose its EPA mileage ratings for the 2020 Ram 1500 EcoDiesel, the Chevy oil-burner still took the trophy. The victory was years in the making, GM engineers spending an entire four-year development cycle refining the LM2 Duramax to increase mileage. The tradeoff, as well all know by now, is towing; the Duramax in half-ton duty pulls a maximum 9,300 pounds in the Silverado. Rivals across town can do more, the Ford F-150 PowerStroke rated at 11,500, the Ram 1500 EcoDiesel game to pull 12,560. GM engineer John Barta told Muscle Cars & Trucks that more hauling chops could be on the way, explaining, "We’re actually looking at upgrading some of the materials around (the engine bay) to see if we can maybe raise our tow rating." Engine bay materials are at issue due to thermal complexities underhood. John Barta, GM's assistant chief engineer of diesel engine controls, said the Duramax's inline-six configuration allowed engineers to get emissions hardware like the combined selective catalytic reduction, diesel oxidation catalysts, and diesel particulate filter unit closer to the engine, where it heats up quicker, getting emissions down quicker. But that filter puts another heat source in those confines, enforcing a cap on the tow rating to keep the engine and other systems from overheating. "If you look under the hood," he said, "youÂ’ll see a significant amount of silver ‘moon tapeÂ’ around to make sure things arenÂ’t getting overheatedÂ… if we were to go up in higher towing, which we can, we start impacting the possibility of deteriorating some of the components.” There isn't much space for more grille, so swapping for a better grade of "moon tape" or a different kind of material could reduce engine bay heat, extracting a higher tow rating in the process.  It's important to note a point Barta's been making for months about the Duramax figures, though. "Even though itÂ’s nice to brag about big numbers, in reality, light duty customers are not towing that large with their trucks," and, "We do know that (95 percent) of our light duty customers donÂ’t tow over 9,000 pounds." On our First Drive of the 2020 Silverado diesel we called out the tow rating, but emphasized that the Chevy and GMC have more important challenges to overcome.

GM under fire from safety advocates over braking problem caused by recall fix

Safety experts are lambasting General Motors over what they say is the automaker’s slow notification of owners of certain 2019 sedans and trucks that a recall fix could cause power braking to fail and increase the risk of a crash, the Detroit Free Press reports.  GMÂ’s original recall in December targeted about 550,000 Cadillac CT6 sedans and Chevrolet Silverado 1500 and GMC Sierra 1500 pickups, all from the 2019 model year, over potentially defective electronic stability control and antilock brakes. In that case, GM said the errors would not show up as a diagnostic warning on the instrument cluster. But after GM had done recall work on 162,000 vehicles, about 1,700 owner have complained that their power brakes didnÂ’t work after they had the recall done and then used the OnStar app to start their vehicle. GM then issued a supplemental fix for customers whoÂ’d already had their vehicles serviced. In this case, a diagnostic warning should illuminate saying either “Service Brake Assist” or “Service ECS,” which GM says is a signal that a customer should not drive the vehicle and instead call their dealer, which will tow the vehicle and have it repaired. Safety advocates say the automaker hasnÂ’t gone far enough to protect customers. “The fact that you could potentially start a vehicle and not have brakes is a pretty risky proposition,” Sean Kane, president of the Safety Research and Strategies, which works on auto issues for plaintiffs and governmental organizations, told the Freep. “The fact that they wouldnÂ’t notify owners (sooner) is pretty stunning.” GM told the Freep it was required to notify the National Highway Traffic Safety Administration and file paperwork before it notified customers about the original recall, which was made Dec. 12. It then had to investigate and resolve the problem created by its original recall fix before alerting customers. GMÂ’s call center and dealers are contacting the remaining 900 customers who havenÂ’t yet had the update made to the original recall repair. GM also hired a vendor to send recall letters to the 550,000 customers affected by the original recall notifying them about the update. There are no known injuries or deaths related to the problem. Read the Freep story here.

Cadillac XT5, XT6, GMC Acadia recalled for two issues

General Motors is recalling three model years of the Cadillac XT5 and XT6, and the Cadillac's GMC sibling, the Acadia. The first recall has to do with the rearview camera. On 2020- and 2021-model-year XT5s, XT6s, and Acadias optioned with Surround Vision, insufficient crimping for the coaxial cables could cause a degraded signal from the rear camera, or cause the signal to fail. With all passenger vehicles required to have a working rearview camera, that's not an ideal situation. Only crossovers with Surround Vision are affected. The population at issue counts 95,231 vehicles, build dates being: XT5s produced from May 1, 2019 to June 23, 2021 XT6s built from February 25, 2019 to June 24, 2021 Acadias built from May 6, 2019 to June 24, 2021  The automaker hasn't been informed of any crashes or injuries related to the problem, and will begin mailing letters notifying owners of the issue on November 7. The fix is a trip to the dealer to have the cables inspected and replaced if necessary. Concerned customers can contact Cadillac customer service at 800-458-8006 or GMC customer service at 1-800-462-8782, then refer to GM's recall number, N222378380. Alternatively, they can get in touch with the National Highway Traffic Safety Administration (NHTSA) Safety Hotline at 888-327-4236 (TTY 800-424-9153), or go to www.nhtsa.gov, and refer to campaign number 22V709000. Another recall concerns just the 2023 Cadillac XT5 and XT6 and 2023 GMC Acadia units that were built on August 9, 2022. That day, a printer in the Spring Hill, Tennessee, Assembly Plant malfunctioned, producing vehicle labels for the driver's side B-pillar with illegible tire size information. That's a violation of a subsection of Federal Motor Vehicle Safety Standard No. 110. Only 24 units are affected, the fix being a jaunt to the dealer for a label with readable information. Owners who don't want to wait until November for letters from GM can contact Cadillac customer service at 800-458-8006 or GMC customer service at 800-462-8782, and mention recall number N222381690. Or they can head to the NHTSA Safety Hotline at 888-327-4236 (TTY 800-424-9153), or www.nhtsa.gov, and refer to campaign number 22V708000.