How to Read Yamaha Error Codes with a Diagnostic Tool

On most Yamaha models from around 2017–2018 onward, and on some older scooters, the dashboard never shows a code number. When the ECU detects a fault, the engine warning light (check engine light) comes on, and the owner’s manual simply says to have the on-board diagnostic system checked by a Yamaha dealer. The code is still stored in the ECU — you just need a diagnostic tool to read it.

Step by step

  1. Note what the engine warning light is doing. On newer models Yamaha’s manuals say that if the light is flashing, you should ride at low speed, because the catalytic converter in the muffler can be damaged.
  2. The simplest option is a Yamaha dealer, who can read and clear stored codes with Yamaha’s own diagnostic equipment.
  3. To read the code yourself, you need a scan tool that can talk to your bike. Many owners use an OBD adapter cable made for Yamaha’s diagnostic connector together with a generic OBD-II reader or phone app. Check that the adapter is listed for your exact model and year before buying.
  4. With the bike parked and the key on, connect the tool and read the stored codes. Write every code down before clearing anything.
  5. Look up each code on this site. If several codes are stored, enter them together in the multi-code diagnosis tool to find causes they share.
  6. Clear the codes only after the repair. If the warning light comes back, the fault has not been fixed.

Fixed the problem and want the light off? See How to Clear a Yamaha Check Engine Light (and When Not To).

Good to know

  • Yamaha’s manuals note that modifications can turn the warning light on even without a failed part — for example rewriting the ECU software, electrical accessories that affect the ECU, or non-standard spark plugs, injectors or exhausts.
  • When you switch on, the warning light normally comes on for a few seconds as a self-check and then goes out. If it never lights, or never goes out, the warning circuit itself needs checking.

Yamaha models and years this applies to

Models sold in the US

US model names and years. How the code is read was checked in Yamaha’s official owner’s manual for the same model sold in Japan, so confirm with your own owner’s manual if your bike behaves differently.

Models sold in Japan

Japanese-market models, checked in Yamaha Japan’s official owner’s manuals.

Models we have not confirmed yet

We have not yet confirmed how these Yamaha models report codes. Check the “Engine trouble warning light” or “Self-diagnosis” section of your owner’s manual: if it says an error code appears on the display, use the dashboard guide; if it says to have the on-board diagnostic system checked, use the diagnostic tool guide. Yamaha publishes owner’s manuals for US models at yamaha-owners-manuals.com.

Tools you may need

  • Yamaha OBD diagnostic adapter cable
  • Bluetooth OBD-II scanner

Sources