Code 12 is always the first code on a GM. Check for a blown ignition fuse. Otherwise, remove all plug wires from the coils. Turn the engine over. You should have blue spark across the coil terminals. If there is no spark from any of them, replace the ignition module.
= "Do you have to flash the computer after you replaced the engine?" =
The regulator is part of the engine computer. The engine computer needs replaced.
P0601 is an internal engine computer failure. The engine computer will need replaced.
Pcm internal failure. The engine computer has failed a self test.The computer may need replaced.Pcm internal failure. The engine computer has failed a self test.The computer may need replaced.
P0601 : internal controller processor failureThe engine computer will need replaced.P0601 : internal controller processor failureThe engine computer will need replaced.
The regulator is in the engine computer not the alternator.
The regulator is in the engine computer, and if failed the computer will need replaced.
Faulty sensor get it replaced if not check to make sure wire isn't shorting out
The engine control computer is on the passenger side of the engine compartment. Its got a black cover covering the wires that are coming out of it
Yes, it helps the engine control computer monitor and adjust the timing
The engine computer is also known as Electric Control Assembly (ECA) and should be located behind the left side dash panel in the passenger compartment.
A whining sound coming from the front of the engine would make me think one of the bearings is wearing out in the belt assembly. This is something you should fix promptly.