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Updated 2026-10-27

SunFounder GalaxyRVR: A wheel spins the wrong way

Researched by Riley Hart · based on SunFounder GalaxyRVR build guide and docs · we may earn a commission

Short answer

Two motor plugs are swapped. Start with this: Left motors go in A, B and C. Right motors go in D, E and F.

Why it happens

Two motor plugs are swapped.

How to fix it

  1. Left motors go in A, B and C. Right motors go in D, E and F.
  2. Swap the plug of the wrong wheel with its neighbour and test again.

Check the step it comes from

SunFounder GalaxyRVR step 18: Plug in the left motors
Step 18 of 49

Plug in the left motors

Plug the three left side motor wires into the left ports A, B and C, routing the wires along the top bar.

Tip: Front motor to A, middle to B, back to C. If a wheel spins the wrong way later, swap its plug.

Check: Three plugs in LEFT.

Common mistake: Leaving plugs half in. Push until the plug sits flat in the port.

See this step in the full build guide

Still stuck?

Show the AI coach a photo

Open step 18 in the free build tool, tap Stuck and take a photo. The coach checks it against that exact step and tells you what to change. 3 free questions per kit.

Open step 18 →

Other GalaxyRVR problems

No camera picture in the appThe ESP32 CAM is in its adapter the wrong way, its ribbon is loose, or the camera is not getting power.The GalaxyRVR Wi-Fi does not show upThe rover is in upload mode, the battery is flat, or the camera board is not powered. The camera board makes the Wi-Fi.The app keeps disconnectingYour phone leaves the rover's Wi-Fi because it has no internet, or another network on the same channel interferes.The app sees the Wi-Fi but will not connectCustom code uploaded to the board replaced the rover's own program, or the camera board firmware is old.One wheel does not turnIts plug is not fully in, or its wire got caught and snapped.No lights when charging or switching onThe battery plug is loose or the battery is flat.

All 12 GalaxyRVR problems and fixes · The full build guide

SunFounder GalaxyRVR Mars Rover Kit$129.99 at SunFounder. Every part and tool in one box.
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Sources

Drawings by robotsforthat. SunFounder GalaxyRVR is a trademark of SunFounder. We are not affiliated with SunFounder.