This is one of the most-searched Sossusvlei planning questions and one of the least clearly answered in existing content. Here is a direct answer.
The Situation
The tar road from Sesriem Gate runs 60km to a car park called the 2×4 parking area. Any vehicle, including the smallest rental car, can drive this road.
Beyond the 2×4 parking, a 5km sand track leads to Sossusvlei pan. This track is deep Kalahari sand with no firm surface. A 2WD vehicle will get stuck. A 4×4 with high clearance and low-range gears drives it without difficulty.
The NWR offers a shuttle service from the 2×4 parking to Sossusvlei pan for visitors without 4×4 vehicles. The shuttle runs on a timetable, charges a fee per person, and returns to the parking area at scheduled times.
The Shuttle
How it works: Purchase a ticket at the 2×4 parking area. Wait for the next departure. Travel to Sossusvlei pan (approximately 10 minutes). Explore Sossusvlei pan and walk to Deadvlei. Return on a scheduled shuttle.
Cost: Per person fee (check current NWR rates at nwr.com.na; rates are reviewed annually).
Timing: The shuttle runs in the morning and afternoon. The timetable is posted at the parking area. The last shuttle back is timed to allow return to the gate before closing. In peak season the shuttle fills; arrive at the parking area early.
What the shuttle covers: Sossusvlei pan and the 1km walk to Deadvlei. It does not go to Hidden Vlei.
The 4×4 Option
Advantages: Full flexibility on timing. No timetable constraint. Access to the Hidden Vlei track (separate 4×4 road from the main track). Complete independence.
Disadvantages: The additional cost of 4×4 vehicle hire versus 2WD (often NAD 300 to 500 per day more). Some visitors hire 4×4 specifically for Sossusvlei and find the shuttle would have sufficed.
The Honest Answer
For most visitors: the shuttle is sufficient. Dune 45, Deadvlei (via Sossusvlei pan), Hidden Vlei (independent walk), Sesriem Canyon, and Elim Dune are all accessible without a 4×4. The shuttle covers the Sossusvlei pan access cleanly.
You need a 4×4 if: You want to self-drive to Sossusvlei pan at non-shuttle times for photography flexibility; you specifically want to drive the Hidden Vlei track; you are visiting Damaraland or other remote areas that genuinely require 4×4 on the same trip (in which case you have already hired one).
For most Namibia itineraries that include Etosha or Damaraland, a 4×4 is being hired for the overall trip anyway. If Sossusvlei is a standalone destination, a 2WD with the shuttle is the more economical choice.