P1633 Chevrolet -

Question

how can i fix it,was giving someone a jump and the cables was not put on right. Now the truck was not turning off and it was making this clicking noise and the outside lights was going off also the check engine light was on.We check all the fuses and the was good so what can the problem be?

Answer 1

P1633 Ignition 0 switch circuit

This code occurs when the PCM detects a improper voltage at Ignition 0. You would have Ignition 1 voltage working which is from the engine fuse block but no voltage at the Ignition 0 fuse block to the PCM. Start by taking out fuse 47 in the engine fuse box and check it for power, and replace the fuse which is a 10 amp fuse,(even if its good) .

Measure your voltage at fuse 47 and its wire which is pink wire from the fuse box to the ECM.You have a open circuit somewhere there