Start at the battery terminals-- loose
check ground wire to engine
check fusible links and ING fuse
you have lost connection to the battery
BCM
SOURCE: Running engine stalled
There are many things that can cause a car to stall while driving it.
An engine is made up of many parts, and many of those parts are either
governed by a computer or provide input to the computer to help it
determine settings for the things it governs. Every vehicle has a fuel
system and an ignition system. The computer and its sensors monitor and
govern the fuel and ignition systems.
If your car stalled
while you were driving it, look for an obvious reason first. Check to
make sure you have fuel in the tank (if your gas gauge is working). Do
not sit there and crank the car over, trying to get it to start, as you
will quickly wear down the battery if it's not already bad.
IGNITION:
The ignition
system is composed of: ignition switch, neutral safety switch, security
bypass, plugs, wires (if applicable) and a coil, or in the case of
coil-over systems, many coils. The crank and cam sensors tell the engine where top dead
center is. Though these sensors do not usually cause a no start, if
they break, the computer will go into "limp home mode," which allows
you to get the car to a service station. The car will run badly, and
may stall out on you.
Because the running of a vehicle is complicated, there are many more
things that can cause a vehicle to stall. These are the most common
things that can cause a car to stall. Other things include wiring,
fuses, relays, other sensors not working properly or at all, a bad
alternator or a bad battery, or an overheating problem, just to name a
few.
SOURCE: I have a 1977 Corvette, L48, automatic, Dead elctrical system
It is more than likely in a fuseable Link coming off of the battery or off of the alternator causing your power lose. How many grounds did you check, because there are at least two grounds on the car. The first one is the main ground off of battery and the second one coming off of the back of the engine.
SOURCE: What does reduced engine power light mean
this model has what they call fly by wire.. no accelerator cable. If the computer detects a problem in the thottle system it will not allow the engine to accelerate and will show reduced power and possibly set a check engine light. The dealer usually wants to replace the throttle assembly which is very expensive and usually un nessesary.
I have had a lot of succes with just cleaning the throttle plates real good.
SOURCE: 2000 pontiac grand am has no power
If the car has no electric power and the battery is charged, the problem would be a major fuse, fuseable link wire, or connection.
You would use a meter or test light and start at the battery, working your way to the starter and fuse box checking for the open circuit.
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