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P0480 GMC -

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Cooling fans coming on when ignition off.

Vehicle: 2005 Gmc Yukon Slt 4.8 vortec

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P0480 Cooling fan 1 control circuit malfunction

Try replacing the cooling fan relay, When the cooling fan comes on when the key is out, you need to find where the ground is comming from, The PCM is more than likey the fault.

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