FSD v14.3.6 Highway Exit Bug: What Owners Need to Do Now

A critical disengagement report from FSD v14.3.6 is making the rounds — and it's the kind that should make any owner on this build pay closer attention. Fred Lambert, editor of Electrek, reported Sunday night that his Tesla attempted to take a highway exit ramp it had already passed, forcing him to intervene to prevent the vehicle from veering off the road. The incident raises a pointed question about whether the v14 line's aggressive capability gains are outpacing its reliability.

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What Happened

According to Lambert's account, the incident occurred on Autoroute 55 in Quebec's Mauricie region while cruising at 110 km/h (68 mph). Conditions were close to ideal — dry pavement, no traffic, freshly painted lane markings, and reflective overhead signage. FSD v14.3.6 nonetheless attempted to steer toward an exit ramp that the vehicle had already passed. Lambert had to physically intervene to prevent the car from entering a ditch.

What makes this report notable isn't just the severity — it's the context. Lambert specifically flagged that he wasn't expecting this behavior from v14, a release line that Tesla has marketed on the back of a rewritten AI compiler promising 20% faster reaction time and an upgraded Reinforcement Learning stage designed to reduce unnecessary disengagements. A ghost exit attempt at highway speed is the opposite of that promise.

Lambert's broader observation — that "FSD is getting more dangerous as it gets better" — points to a pattern some owners have flagged before: as the system takes on more complex scenarios, the failure modes when it does fail can become more consequential. A hesitation at a local intersection is recoverable. A hard pull toward a ditch at 110 km/h is not.

The Broader v14.3.x Picture

This incident doesn't exist in isolation. According to background research, v14.3.6 has drawn mixed feedback since its rollout to Hardware 4 vehicles in late July 2026. While some owners praised overall smoothness, others reported regressions versus v14.3.5 — including turning hesitancy, steering wheel jerking on local roads, and inaccurate lane positioning. Tesla's own v14.3.7 release (software version 2026.21.6), which began rolling out around August 15, specifically targeted "jittery" braking and related regressions from earlier v14.3 builds. If you're still on v14.3.6, that context matters.

Separately, Hardware 3 owners running FSD v14 Lite (2026.20.6.11) have seen their own issues — a wave of Autopilot computer overheating alerts and, in some cases, full computer failures following the wider rollout. The v14 generation is clearly still being stabilized across both hardware platforms.

Action Plan for Owners on FSD v14.3.6

If your vehicle is currently on v14.3.6, here's what to do right now:

1. Check your software version immediately. Go to Controls → Software. If you're on 2026.21.6 or later, you've already received v14.3.7, which addresses some v14.3.x regressions. If you're still on an earlier build, proceed with extra caution until the update arrives.
2. Enable update notifications. Go to Controls → Software → turn on "Software Update Preference" to "Advanced" if you want updates pushed as soon as they're available rather than waiting for a scheduled install.
3. Treat highway driving with heightened vigilance on this build. Lambert's incident happened in near-perfect conditions. Don't assume clear roads and good weather mean FSD will behave predictably. Keep both hands within reach of the wheel on any highway segment with exits.
4. Watch for unexpected lateral movement near exit ramps. The specific failure mode here — a late-stage pull toward a ramp already passed — may not give much warning. If you notice the steering wheel beginning to turn toward an exit you're not taking, intervene immediately and firmly.
5. Report the incident through the Tesla app if it happens to you. After any critical disengagement, go to Controls → Safety → Dashcam → Report Safety Issue. Tesla's engineering team uses these reports to identify regression patterns. The more data points they have, the faster a fix gets prioritized.
6. Check for the v14.3.7 update proactively. If your car is parked and connected to Wi-Fi, tap Controls → Software → Check for Updates. The update targeting v14.3.x regressions is already out for HW4 vehicles as of August 15.

The Supervised Part Still Matters

Tesla calls it Full Self-Driving (Supervised) for a reason. Lambert's account is a real-world reminder that the "supervised" qualifier isn't marketing hedging — it's an operational requirement. The v14 generation is genuinely more capable than what came before it, but incidents like this confirm that capability and reliability are not the same thing. Until Tesla demonstrates consistent behavior across a wide range of edge cases, the driver's hands belong near the wheel. Check your version, install the update if it's available, and stay engaged — especially on highways with frequent exits.

For ongoing coverage of FSD updates and what each build actually changes for owners, see our FSD coverage.

This report was curated by the BASENOR Editorial Desk from the sources listed above. Read our editorial standards or email editorial@basenor.com to report an error.