what is code 1625 for chevrolet lumniana

Question

can someone please help with this code, i have had a lot of trouble staying running starter battery, alternater what can it be

Answer 1

P1625 Fan circuit malfunction

This does not apply to your symptom. Do you mean P1635, this will apply to yor situation it is a loss of 5 volt refernce,When you loose the 5 volt reference it is either from a shorted TPS (throtttle position sensor, MAP sensor, EGR,More than likely a loss of 5 volt refernce is do to the connection of the ECM, The ECM is located in the engine compartment, The ECM has poor sealing, and corrosion can build in there, simply disconnect and inspect for proper pin and clear any corrosion that may build up there and reconnect.and retest,