My 03 suburban engine light was on ...the parts store said it was throttle..relaced in and then several hours later it woulnt start..then finally it tarted but the gauges dont work and the ABS , check engine, air bag, battery light are all on I am not sure what this could be i have a little diagnostic machine and it is saying that it cant communicate with the vehicle what could be going on ?

Ignition switch , possibly . GM had ignition switch issues . Plus GM had instrument cluster issues as well . Have you ever heard of silver migration in electronic componets with solder connections ? Have a video for you to watch , from a auto repair Tech. has his own shop .Instrument cluster draining the battery ! Chevrolet Truck Battery Dies Overnight Part
Chevrolet Truck Battery Dies Overnight Part II

remove the air duct hose that goe's to the throttle body, then you can see the throttle body area, you can purchase throttle body spray cleaner from a auto part store, start vehichle up and let run, and while holding down on throttle so engine won't die, gradually spray the cleaner into the throttle body area, and continue to let engine run untill smooth, so that the cleaner that was sprayed has time to burn the excess off of the o 2 senors, if engine light comes on after this, shut off engine, and disconnect 1 of the battery cables for about 1 minute, then reconnect the cable, and start engine up, light should be out, but later , i would hook up a code tester to the aldl under the instrument panel on drivers side to make sure code # from the light being on was removed, hope that this information was helpful to you.

it sounds like distributor check for spark when it wont start if there ig no spark then its faulty

If the Check Engine light comes on there is a problem.
1. Find a new mechanic!
2. After this Check Engine Light comes on there should be a Code or several Codes.
a. If so Turn the Key from off to the ON (not start) position THREE (3) times. On the THIRD (3rd) time leave the the Key in the ON (not start) position.
b. If you have an Digital Odometer, the Code(s) will appear there. "P" followed by four (4) numbers. Let it give you all the codes until it reads "P donE". Record these numbers.
c. If your do not have a Digital Odometer, the Check Engine Light will start Blinking. Carefully count the number of Blinks. Most are in two (2) or three (3) digit numbers. Again let the Light go thru all the "blinks", The Final blinks should be 5 blinks and 5 blinks.
Regarding your dying problem:
Lights dimming after it starts, could indicate that your alternator is failing. One easy way to check this is:
A. Start the car.
B. With the Engine running: Remove the negative (black side) wire from the Battery.
C. If the Engine dies the alternator is bad. The Battery "starts" the engine. The Alternator keeps the engine going.
Regarding your Gas Pedal:
(1) Check underneath the dash where your Gas Pedal it located. Check for wires or anything else that could be hindering the Pedal from going down.
(2) With a Partner pushing down on the Pedal (engine on or off) Check inside the Engine compartment to watch the Throttle Cables for movement or binding. Also (with a partner) Pull on the throttle cable or turn the throttle connection to see if the Throttle is capable of openiing fully. The partner should be looking under the pedal to see if it is also moving. Do not force (too hard) the throttle or cables. If the throttle itself is binding, it may need cleaning: Remove and check for dirt, grime and function (opening / closing all the way). You can use some penetrating oil on moving part to loosen these areas.

Let me know if this helped or if you have additional questions or information. Feel free to contact me on FixYa.com!

p0440 - Evap. system performance (this could be something as simple as not turning the gas cap several times after you fill up.

p0456 - Evap leak monitor Small leak detected. - Could be related to the previous code.

p2106 - Throttle Actuator Control System - Forced limited power : This one you might have noticed the vehicle running rough, overdrive not working properly and cruise control will not set.

p2175 - Throttle Actuator Control System - Low airflow detected.

What you might want to try first is have the codes cleared which most auto parts stores offer this for nothing (unless you have a programmer then you can do it yourself). Pour in some fuel injector cleaner into your gas, put a new air filter on. And when you fill up your gas tank, crank the cap several times when you put it back on.
See if the codes come back on after that.

It sounds like a fuel pump getting weak and hot. First check the ground wire at the fuel pump pigtail. and replace the fuel fiter.

The engine light was on, but is now off? I would check for stored engine codes to hopefully get some idea as to what the heck was going on, as your confidence in taking a 200 mile trip is probably a bit shaky. Most parts stores will check for codes for free. You can post any questions u have w/ the codes here, along w/ the above info. Curt

If the check engine light has been coming on you could take it to an Advance Auto Parts store and they can run the codes for you for FREE and tell you why the light is coming on. That way you or whoever is not just guessing so you are not replacing parts not needed which can get expensive. Sounds like it could be as simple as a tune up but could also be a sensor of some kind which there are several that could cause your problem. MAP sensor, Mass Air Flow sensor, throttle position sensor just to name a few.

It might fix the problem but you may also have a shift sensor that is starting to go bad as well take you suburban to autozone or an o'reillys if you have one of those auto parts stores near you and they can do a scan on all the sensors to tell you if your vehicle is showing any problems with any of your sensors I hope this helps you out.

Thru all of the above, has the check engine light ever gone on? Even if it hasn't I'd have the engine codes checked w/ a scan tool, to see if there are any stored codes on the Suburbans computer. U can have it done for free at most parts stores, and they will give u info on what to do to correct any trouble codes that show up. Do the above, and after discussing any codes w/ parts store , if u need further help, let me know. Good Luck!