gotabav, Im not surprised you're getting a DTC (probably P1481) with efans. Go into System->VATS->Platform Options 1 and change the Electric Fans param to Enabled. Just killing the DTCs doesnt actually stop the PCM from performing the startup diagnostics on the fan clutch, by Enabling this parameter it bypasses the PCMs diagnostics routine and will not throw fan clutch related codes. Works perfectly on my P10 PCM which shares a TON of code with the 4cyl PCMs.