How do you reset the ecm/ecu on a 2006 gmc sierra 3500 6.0 liter? Had a bad throttle body, replaced it, and now the truck wont idle. As long as you pat the gas pedal it will stay running, you quit patting it and let it idle and it dies. Thanks in advance for your help.

hello
u'd need a proper manual for this in my opinion
like there are plenty of dealers and online shops that deal in those..
you can get some free at reliable-store and it;s actually really illustrative

Check for fuel by pouring small amount of clean gas down throttle body and crank engine over. if it starts and runs just for a few seconds you have a fuel delivery problem

You probably need to adjust idle speed

{: ) DTC P0506 Idle Speed Low
The usual cause is an excessive carbon build-up on the throttle body. If this is the case, I suggest you have your throttle body cleaned and perform an idle relearn procedure using a GM scan tool. The idle relearn or reset procedure is very important, otherwise this code may still remain even after a throttle body clean.
In a similar fashion, if the ECM/PCM (engine control module) of a high mileage vehicle is replaced and/or reprogrammed without performing the Throttle/Idle Learn procedure, the ECM/PCM may no longer compensate for existing carbon build up in the throttle body, causing it to return with a similar concern as well as DTCs P0121, P0506, and/or P0507.
There are other conditions that can also affect or reduce idle speed by increasing engine load like incorrect torque converter clutch (TCC) operation, accessories that require additional torque to operate, restricted exhaust, and mechanical conditions that limit engine speed.

you will need to do a base idle adjustment bridge the diagnostic pin out and the earth pin out black wire and white and black trace(i think) on the diagnostic connector the engine fan should run at any temp and the check engine light should flash this takes out the ecu operation of the vehicle therefore it will be like a carbie(make sure the vehicle is at or close to operating temp) disconnect the IAC connector then adjust the throttle stop screw to get the right base idle 6-800 rpm while slowly blocking off the iac hole inside the throttle body(may stall a couple of times but persist) with this in mind this is also the way to get flash codes from the ecu just with ignition on terms still bridged first flashes are 10s short break then units eg. two flash=20 three flash after= code 23 long break next code and so on 12 is system ok

Wow, That has gotta be a pain. The Maf sensor regulates the fuel supply needed for proper air fuel ratio by telling ecu how muc air is moving thriugh the intake. Check it first, Then the TPS. Good Luck.

Did you change the fuel presure regulator located in the throttle body?

Try this, remove (MAF) Mas Air Flow sensor,(be sure key is OFF) so you don't set a trouble code when disconecting wire conector, with some throttle body/air intake cleaner from the outlet side of MAF, spray the sensor clean, let dry, reassemble.Remove snorkle from throttle body, and with a old tooth brush, clean throttle body& plate with cleaner, may take a couple of cans if throttle is badly 'coked' up. Hope this helps.

Im not sure if this can help, but my 2000 gmc sierra was idling badly. Replaced Fuel Pressure Regulator and my truck runs like its brand new. My service engine light was also on.

next time it happens try spraying water in mist form around the throttle body if it bogs, replace the throttle body gasket. if it doesn't bog you may have a bad wire wait until dark start the vehicle have someone feed the fuel very slowly and watch for arching from a wire it will be easy to see when it is dark, replace that wire.