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    2002 Yukon 2500 8.1 Reduced Power URGENT

    Thanks for the reply! I do have the live data option on my scanner, and I've checked that. Everything seems good as far as voltage and resistances go on the wires. The car has been in AZ its entire life, so corrosion is unlikely. I did check all the wires in the harness and the connectors...
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    2002 Yukon 2500 8.1 Reduced Power URGENT

    Hi everyone, In the last last few months my 2002 2500 8.1 123k miles has been throwing itself into reduced power mode. Alternates between codes P1125 and P1221 (but mostly P1125), and never both together. Sometimes it will go a week without having an issue, it even went a month after I...
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    Overheating with Rear AC ON

    Hey everybody. Our 2002 Yukon XL that we use here in AZ for towing boats has started doing something very strange. We had the whole top end rebuilt, radiator, water pump, thermostat, coolant tank, and fan clutch replaced. So the whole cooling system. Being 105F+ here, the truck actually runs...
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    2002 Yukon XL 1500 Overheating!***Very Strange

    Hey everybody. Our 2002 Yukon XL that we use here in AZ for towing boats has started doing something very strange. We had the whole top end rebuilt, radiator, water pump, thermostat, coolant tank, and fan clutch replaced. So the whole cooling system. Being 105F+ here, the truck actually runs...

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