A cup of coffee near the cupholder — and a Chevrolet Silverado or GMC Sierra owner is suddenly convinced their transmission is on its way out. The truth is far less dramatic: GM has issued service bulletin 26-NA-142, and the real culprit isn’t the transmission at all — it’s a drop of liquid finding its way into the electronic shifter module.
The bulletin covers the Chevrolet Silverado 1500 and GMC Sierra 1500 from the 2022–2026 model years, plus the GMC Hummer EV — every truck with an electronic shifter on the center console. Sitting right next to the cupholders turned out to be less than ideal: coffee, soda, or even plain water can easily find a way inside. GM lists four diagnostic codes — P17F4, P189D, P07B2, and P07B8. All of them trace back to the buttons and sensors that handle range selection and Park.
Here’s the frustrating part — there may be no trace of the spill left at all. The surface gets wiped clean long before anyone notices, while a sticky residue quietly dries out inside the mechanism and keeps jamming the button. GM’s guidance is clear: don’t start by replacing the shifter. First comes inspection, a microfiber cleanup, then at least ten full cycles through every position, including the side lockout button and Park.
After that, the codes get cleared and the process repeats. If they don’t come back and the buttons move freely, nothing needs replacing. Only when cleaning doesn’t solve it does GM call for a Gear Shift Control Module swap. So this isn’t the same as a failing automatic transmission — and it isn’t a recall either, just a bulletin for dealer technicians. For owners, the fix is a lot cheaper than any repair bill: keeping a lid on your drink near the electronic shifter isn’t just tidiness anymore — it’s a necessity.
Chevrolet also unveiled the 2027 Traverse Z71 in Ecuador. The seven-seat crossover gets a 2.5-liter turbo engine producing 328 horsepower, an 8-speed automatic, and all-wheel drive; local pricing hasn’t been announced yet.
