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Thread: Error code 21
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post #2 of (permalink) Old 06-02-2019, 02:16 PM
HighDezRhino
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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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