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Figure out what tripped the code and fix the problem
You don't, fix the vacuum leak that's causing the eratic idle conditions
I just did it on 2003 buick rendezvous,i bought a can of fix leak,oil,freon all in one from advance and hooked it up to the lower a/c port and charged it to about 35 psi and the air blows like new.
yes
May be idle position sensor.
I have a 02 buick rendezvous mine would blow a lil heat but never would get hot. We had it checked it was the thremostat, that is what was wrong with mine. They told me there is three things it could have been , it could be low on antifreeze , thremostat, or if you have to keep adding antifreeze often then it is your heater core.
U need to clean the throttle body and also clean the idle air control vavle
To fix high idle problem on a 1996 VS Commodore, first locate the idle air control valve. Unscrew and unplug electrical connector running to the valve. Turn the valve over and clean the sensor for debris.
manually under the hood.
Because something is broken, or your idle speed has been set WAY to high. Try to fix this soon.
Could be throttle plate frozen in throttle body - try to free it with screw driver or wooden dowel 74delta, spent every waking hour trying to fix vortec engine for the last 2 weeks,with same problem, it was the intake gasket, THANK GOD I found it.
You can't fix the BCM you have to replace it, then it needs to be programed and the anti-theft needs to be reprogramed also. Most places won't be able to do this, you'll have to take it to a dealer.