Can you help me with a trouble code

2003 GMC ENVOY
125,000 MILES
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FOUGHT
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The clutch fan would engage and my engine would roar. I took the car to my mechanic and he said it was code P1480 so we replaced the sensor necessary. It has been less than a year and it is happening again. Someone told me the sensor had to be programmed to my vehicle. I went to the dealer and was told by the parts department that was not true but a mechanic there told me it is true, they call it flashing.The service writer said I should just bring it in and replace the clutch fan (to the tune of $1200.00)of course. My mechanic says he has never heard of flashing. Can you shed some light please?
Sep 23, 2011 at 5:30 PM
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HMAC300
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can't seem to find a p1480 code. flashing is when you need to update a computer, usually at a dealer and they put someomre data into it to correct problems like yours. Are oyou oging to beleive a guy behind a parts counter who just sells parts or the guy that actually fixes the vehicles
Sep 23, 2011 at 5:36 PM
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HMAC300
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oki found it its' a code p1481 and it may need to be flashed. but check for chafing on wire harness as tehre is a tsb on this -picture included.
Sep 23, 2011 at 5:42 PM
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