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2003 GMC Yukon XL Denali Questions

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The stability system disabled came on after my truck came to a complete stop and now it doesn't drive forward in any gear, the brakes go all the way to the floor, and the vehicle will only drive in reverse. Even after replacing the calipers, the brakes, and the rotors, why is it still not driving?
Body type code?
After driving for an hour and a half my dash will say reduced engine power and stability system disabled and when I shut it off for a few minutes it goes away and I'm wondering why??? Any suggestions..Thanks
Mechanic has been driving accordingly. it's been driven for over 250 miles. still have not heard anything yet> do you have any suggestions? Thx. Vincef
Sometimes happens more in cooler weather while driving truck stops and says reduce engine control check engine light reads sensor can i change just the sensor or what is the cheapest fix I can do
Power steering fluid low and leaking around master cylinder.
running rough,stalling,engine dies when press gas pedal.
I have heard that a map sensor could be bad,when you start it files rough. I have heard that the air compressor could be bad but I think I hear come on
WHEN I CHECK WITH ONSTAR DIAGNOSTICS THEY SAY IT IS NO LONGER A PROBLEM BUT HAVE IT CHECKED IF LIGHT STAYS ON. IT IS NOW ON FOR OVER 10 RESTARTS. BEFORE IT WOULD GO OFF AFTER 4 OR 5 RESTARTS. SHOULD I BE CONCERNED?
When you start it up you can hear the air pump start,but it says according to the program guide that comes up.
Can I get replacement light sockets for the running lights?
havent found a place on the southside or chicago that specialize in just tune ups
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