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Dear abbeyroadman,
May this find you well. A "short circuit to ground" means that a wire's insulation has failed. This allows the electricity to flow outside of the wire, and so not to reach the destination. The device, that is being starved of power, complains. That is why you see a Trouble Code.
Your car likely has an outside temperature sensor located near the front grille, which sends a signal to the blower motor. The wire or wires running from that sensor to the blower motor has/have failed.
You will need to:
(a) find the sensor
(b) inspect each wire running from it to the blower motor (under the dash, inside the car)
(c) if necessary, use a Volt-Ohm-Multimeter to see which wire is broken (use the Ohm setting)
When you find the broken wire, you can:
(a) replace it with a length of brand new wire
(b) splice the broken wire using a crimp-type splice
(c) if the insulation has simply worn through, but the wire has not broken, wrap the damaged area with electrical tape (usually black plastic) to restore the insulation.
Hope this helps.
Yours faithfully,
spook
Ambient temperature sensor (on blower housing):
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