Error code 21 - Yamaha Rhino Forum - Rhino
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post #1 of 2 (permalink) Old 06-02-2019, 01:56 PM Thread Starter
Join Date: Jun 2019
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Error code 21

2008 Yamaha Rhino 700 - I need some help diagnosing and clearing code 21. I haven't been able to find any info on this code. Thanks
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post #2 of 2 (permalink) Old 06-02-2019, 02:16 PM
HighDezRhino's Avatar
Join Date: Jan 2018
Location: Oceanside, CA
Posts: 81
According to the users manual, which also advises how to clear fault codes, these are the indications causing the error.

Open or short circuit in wire harness.
Defective coolant temperature sensor.
Malfunction in ECU.
Improperly installed coolant temperature sensor.

You'll need to explore everything related to the proper operation of your temp sensor. Coolant level ok, sensor working correctly, wiring connected securely, etc.

Do a google search to get a hold of a pdf version of a users manual for yourself. Lots of needed info in there.
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