If your Chevrolet Tahoe keeps insisting there’s a car in your blind spot on an empty road, you’re not imagining things. It is. General Motors has confirmed the problem, and there’s now an official fix.
GM has issued preliminary information bulletin PIT6533A, updated August 14, 2026, addressing false or “ghost” left and right Side Object Detection alerts. Owners report the blind spot warning lighting up while driving with nothing around the vehicle.
A Software Bug Inside the Radar Itself
The culprit is a software anomaly in the short range radar modules that power the Side Object Detection system. These are the small radar sensors tucked behind the corners of the bumper fascia, and the bad code makes them report objects that don’t exist.
Here’s the part that makes this one messier than the average bulletin: the anomaly affects both factory-installed radars and replacement service parts. GM notes the ghost alerts may even show up right after a collision repair where a shop installed brand new radar units. In other words, a dealer could swap in a fresh radar from the parts shelf and hand you the exact same problem back.
Not Just Trucks: SUVs, EVs, and Escalades Too
The scope here is wide. Nineteen models across all four GM brands are named in the bulletin, covering North America. The full-size SUV family (Tahoe and Suburban, Yukon, Yukon XL, and Escalade) is affected for 2026, and so are GM’s electric pickups, including the Silverado EV, Sierra EV, and both GMC Hummer EV body styles.
Notice the pattern: the full-size SUVs and EV trucks are only listed for 2026, while crossovers like the Traverse, Acadia, and Enclave carry into 2027. That suggests corrected radar hardware is already flowing into some 2027 production.
The good news for pickup owners: we checked NHTSA’s records for the gas and diesel trucks directly, and the bulletin does not appear for the Silverado 1500, Silverado HD, Sierra 1500, Sierra HD, Colorado, Canyon, or Terrain. If your ICE truck is throwing ghost blind spot alerts, it’s a different issue, and worth its own trip to the dealer.
The Fix: No Reflash, Full Radar Replacement
This isn’t an over-the-air update situation. Affected radars get replaced outright, and there’s a verification step built in because of that contaminated service stock.
Here’s how the process works at the dealer:
- The technician opens a case with GM’s Technical Assistance Center (TAC) and provides the radar’s Trace Data Identifier (or a photo of the radar module itself).
- TAC verifies whether that specific radar carries the software anomaly.
- If confirmed, the radar is replaced with the latest part number in GM Parts Connect.
- Because service stock is also affected, GM tells dealers to run the replacement radar’s Trace Data Identifier past TAC too, before installing and programming it.
GM has published warranty labor operations for front, rear, and rear side short range radar replacement, and the work falls under the bumper-to-bumper warranty (Canada Base Warranty coverage in Canada). For vehicles this new, that should mean no out-of-pocket cost.
What Owners Should Do
If your 2026 or 2027 GM vehicle on the list above is seeing phantoms, mention bulletin PIT6533A by name at the service desk and describe when the false alerts happen. The bulletin is a PI (Preliminary Information) document, so not every advisor will have it top of mind yet, and the TAC case requirement means this isn’t a fix a technician can freelance in the lane.
One practical tip: if your vehicle recently had collision repair involving a bumper or radar replacement and the ghost alerts started afterward, tell the dealer that specifically. GM calls out exactly that scenario in the bulletin.
A blind spot monitor that cries wolf is more than an annoyance. Drivers learn to ignore it, and that’s the one thing a safety system can’t afford. Until the radar is swapped, treat every alert as real and check your mirrors the old fashioned way. We’ll keep tracking this one alongside the rest of GM’s technical service bulletins, and if you’re shopping the affected SUV family, our 2027 full-size SUV color guide with RPO codes covers what’s coming next.
Join the Discussion
Has your Tahoe, Yukon, Escalade, or EV truck cried wolf on the blind spot monitor? Tell us about it in the 2021-2026 Tahoe, Suburban, Yukon and Escalade forum, or the Silverado EV and Sierra EV forum if yours is electric.
Zane Merva is the Executive Editor of GM-Trucks.com and the President of the New England Motor Press Association (NEMPA). A veteran automotive journalist with over 26 years of experience, Zane is a designated ‘Car Talk’ Expert and has been a contributor to The Boston Globe. He possesses a unique evaluative perspective, having road-tested more than 2,000 vehicles across every major manufacturer. While he is a recognized authority on General Motors truck platforms—including the Silverado, Sierra, and Colorado—his expertise is grounded in decades of deep competitive analysis that few in the industry can match. His commentary has been featured by major OEMs and media outlets, including Hyundai and PR Newswire