Hey can someone help me out, I just swapped a P59 ECU in an 03 Sierra that had a bad pin on the fan control, fans where on all of the time. I put in a a P59 from an 05 Express, I have everything working, but the battery light is staying on all the time, even though the gauge is at 14, and the charging system is putting out 14.3 to 14.4.
Is there a we to turn off the idiot light and use only the gauge.