HI there
There can be a few causes for this code. Usually the most common is the crank position sensor itself, but you can also have an issue with the connector, the signal plate and in some cases a weak battery can cause this code to come up.
P0337 KIA - Crankshaft Position Sensor 'A' Circuit Low Input Read more: https://www.autocodes.com/p0337_kia.html
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