Tesla’s Full Self-Driving software has started telling owners that the cameras behind their windshields are covered in residue when the glass is completely clean. The false alert appeared on vehicles running FSD version 14.3.9, which Tesla began rolling out in mid-September, and it reads: “Poor camera visibility detected. Interior windshield residue cleaning is required.” Several owners took the message at face value and paid for cleaning or inspection appointments before learning nothing was actually wrong with their cars. Tesla has since confirmed the warning is a software defect rather than a real camera problem.
The bug affects cars running FSD v14.3.9 under two specific builds, 2026.27.5 and 2026.27.6, and it tends to appear in bright sunlight or heavy glare rather than showing up at random. Owners who drove the same car later in the day, once the sun had moved or clouds rolled in, reported the identical warning clearing on its own, and the pattern held across posts from drivers in different states rather than looking like a single car’s fluke.
A Vision Encoder That Reads Glare as Grime
The false reading traces back to the vision encoder inside FSD’s neural network, the component responsible for judging whether the forward-facing cameras have a clear view of the road ahead. Not a Tesla App reported that the encoder became overly sensitive after the v14.3.9 update, misreading ordinary sun glare as camera contamination severe enough to demand a cleaning, even on cars whose lenses had nothing on them at all. The same misreading did not require any particular driving condition beyond direct light hitting the glass.
The same update quietly added Automatic Collision Evasion to Hardware 4 vehicles, a feature that lets FSD briefly take manual control to steer around an impending crash. Tesla bundled that new safety capability into the identical release that broke the camera-cleanliness check.
FSD’s version numbers move fast: builds 2026.27.5 and 2026.27.6 both shipped inside the same v14.3.9 window Tesla used to introduce that collision-avoidance feature. Pairing a driver-assistance change with an adjustment to how the cameras judge their own cleanliness meant a coding error in one system reached drivers without first being caught in the other.
Owners Pay for a Problem That Doesn’t Exist
Electrek reported that Tesla is proactively canceling service visits booked by owners who saw the warning, rather than waiting for each case to be flagged individually by a technician. Owners who had already paid out of pocket for a cleaning or inspection they did not need have been told they can contact Tesla Support directly for a refund. Tesla has not disclosed how many owners paid for the unnecessary service before the pattern was identified, nor how many appointments it has canceled since, and it has not said whether the refund process runs automatically or requires each owner to ask.
One owner, posting under the handle @CARN0N, shared a screenshot of a Tesla Support representative acknowledging the fault outright and telling the driver the message stemmed from a known software bug rather than a genuine hardware problem. Drive Tesla Canada heard the same explanation directly from Tesla, tying the false alerts specifically to the v14.3.9 rollout and its two follow-on builds, and noting that Tesla gave no timeline for when refunds would be processed automatically rather than case by case.
Tesla’s guidance to owners who see the warning is to hold off on booking anything. Drivers who already scheduled an appointment because of the alert can cancel it themselves, since the company has said the great majority of the flagged cars need no physical service at all.
A Fix That Hasn’t Been Confirmed
Tesla says a fix is expected in FSD v14.3.10, and that build has already begun reaching some vehicles. The Electric Viking reported that v14.3.10’s release notes are identical to the ones published for v14.3.9, leaving no documentation confirming whether the glare-detection change was actually corrected or is simply still being tested in the field.
E-Vroooom found owner reports of the false alert continuing to surface on forums and Reddit even after v14.3.10 reached some cars, a sign the bug had not fully cleared by the time the newer build shipped.
Until Tesla documents exactly what changed in the new build, drivers who see a “dirty camera” warning on a sunny afternoon have little way to know whether it reflects the same coding error or an actual problem worth checking. For a company trying to prove FSD is reliable enough to run robotaxis without anyone behind the wheel, a vision system that cannot reliably tell sunlight from dirt is the kind of glitch that invites exactly the scrutiny Tesla can least afford right now. The episode also leaves service centers absorbing the cost of appointments nobody actually needed, work that Tesla’s technicians had already begun processing before the company traced the warning back to software rather than hardware.
This article was produced with the assistance of AI and reviewed by Morning Overview editors prior to publication.
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