Ignition switch maybe , GM has problems with switch . Test it ! Do you know how to do automotive electrical testing ? Test main powers to the ignition switch . Back probe the B+ power wires Both are red at the ignition switch ! They get B+ from IGN A & IGN C fuse's in the under hood fuse/ relay box ! One is 40 amp , the other is 20 amp .
This problem your having you say happens when you turn the key , correct ? Turn the key to ? ON - START ? or doesn't matter ? The ignition switch supply's B+ voltage to all the things your losing power to.
SOURCE: 2002 Chevy Blazer stalls
check airflo sensor or potentometer,throttle pos sensor; if revs are to low when turning the wheel the power steering pump will draw power from engine, causing your other problems
SOURCE: 2001 Chevy Impala won't start
If the battery has gone dead, it could cause the security system to go into full lock-up mode. If it has locked up the accessories will work after the battery is charged back up , but the power to the starter will be cut off and it wont turn over. You need to do the 30 minute learn procedure. A GM dealer will print it out for you and you can do it yourself. It's very simple if you follow the procedure exact. hope this helps and good luck.
Locate the IP to body harness connector, THIS CONNECTOR IS UNDER THE DASH HIGH UP ON THE LEFT HAND SIDE. Check to see if there is a water leak into the area and repair as necessary. Use a water hose to determine the source of a water leak and effectiveness of repair. Some examples of potential water leaks are: A-pillar seals, sunroof drain lines (if so equipped) and windshield/cowl sealing. Finally, repair or replace the IP to body harness connector, making sure no corrosion or debris is left on or between the terminals.
IT IS ADVISABLE THAT YOU REMOVE THE INTERIOR CARPETING AND DRY IT THROUGHLY. IT WILL MOLD AND SMELL REALLY BAD AFTER A FEW DAYS IN THE HEAT.
USE A WATER HOSE STARTING LOW AND WORKING YOUR WAY UP TO DETERMING WHERE THE LEAK IS. OR USING A FOAMING TYPE WINDOW CLEANER SPRAY IT WHERE YOU THINK THE LEAK MIGHT BE AND USE COMPRESSED AIR FROM THE INSIDE ON THE TRUCK FOLLOWING THE SEAMS AND WINDSHIELD.
SOURCE: I have a 97 Chevy Blazer w/ 181,000 miles. When
if the key is getting stuck its the Brake Shift Interlock Solenoid its just under the ignition switch you have a short in it you can unplug it or replace it what its doing is over heating the solenoid and at times it can drain your battry.and for the trans acting up you could have a short to one of your solenoids or it could be the trans filter.
SOURCE: 2003 Chevy Impala periodically won't start
Try under the dash, attached to colum is a switch that the rod goes into from your ignition key switch, that may need to be adjusted tword your steering wheel just a touch, they go out of alignmnet from time to time
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