Cruise Control Issue

xzz0195 · July 16, 2010

What's are best practices for troubleshooting a cruise control?

dlewis1111 · July 16, 2010

What's are best practices for troubleshooting a cruise control?

Fuses, and this may sound crazy, but on some years if you have tail lights out the cruise will not engage. Please be more specific with the problems if possible.

xzz0195 · July 16, 2010

What's are best practices for troubleshooting a cruise control?

Fuses, and this may sound crazy, but on some years if you have tail lights out the cruise will not engage. Please be more specific with the problems if possible.

Was driving the other day and cruise was working, then went into a shop, returned got on highway cruise was not working. Attempted to switch it on and off many many times (while driving), push button to set cruise many times, cruise light comes on, but NO Cruise...

oldschool327 · July 17, 2010

Cruise TSB has been out since 08. Mine was a combination of the brake switch and TCM. Has been posted many times. Search function, baby Search

http://www.carcomplaints.com/GMC/Sierra_1500/2008/tsbs.shtml

bossier62guy · July 17, 2010

Cruise TSB has been out since 08. Mine was a combination of the brake switch and TCM. Has been posted many times. Search function, baby Search

http://www.carcomplaints.com/GMC/Sierra_1500/2008/tsbs.shtml

I think he's referring to his 99 Sierra....could be wrong though

oldschool327 · July 17, 2010

Opps thanks.............So many post about the new style cruise problems didnt even look at the year he had. Same site can narrow down the different years if it was a factory issue also. Could be a vaccum port problem if it is a 99.

bossier62guy · July 17, 2010

Opps thanks.............So many post about the new style cruise problems didnt even look at the year he had. Same site can narrow down the different years if it was a factory issue also. Could be a vaccum port problem if it is a 99.

I'm going to make the assumption it's an 800 series as well....

bossier62guy · July 17, 2010

What's are best practices for troubleshooting a cruise control?

Fuses, and this may sound crazy, but on some years if you have tail lights out the cruise will not engage. Please be more specific with the problems if possible.

Was driving the other day and cruise was working, then went into a shop, returned got on highway cruise was not working. Attempted to switch it on and off many many times (while driving), push button to set cruise many times, cruise light comes on, but NO Cruise...

So everything works as normal with the exception that you aren't able to maintain a set speed correct? If that's the case it sounds like the switch is doing it's thing and the PCM is sending the data to the IPC. You might have an issue under the hood w/ the cruise control module. I'm looking at 02 wiring diagrams which should be similiar to the 99 if it indeed is an 800 series truck....please verify.

xzz0195 · July 17, 2010

What's are best practices for troubleshooting a cruise control?

Fuses, and this may sound crazy, but on some years if you have tail lights out the cruise will not engage. Please be more specific with the problems if possible.

Was driving the other day and cruise was working, then went into a shop, returned got on highway cruise was not working. Attempted to switch it on and off many many times (while driving), push button to set cruise many times, cruise light comes on, but NO Cruise...

So everything works as normal with the exception that you aren't able to maintain a set speed correct? If that's the case it sounds like the switch is doing it's thing and the PCM is sending the data to the IPC. You might have an issue under the hood w/ the cruise control module. I'm looking at 02 wiring diagrams which should be similiar to the 99 if it indeed is an 800 series truck....please verify.

It is the 99 Sierra SLE 5.3L Vortec... and that is correct cannot set speed which means it can't maintain it as well.

bossier62guy · July 17, 2010

What's are best practices for troubleshooting a cruise control?

Fuses, and this may sound crazy, but on some years if you have tail lights out the cruise will not engage. Please be more specific with the problems if possible.

Was driving the other day and cruise was working, then went into a shop, returned got on highway cruise was not working. Attempted to switch it on and off many many times (while driving), push button to set cruise many times, cruise light comes on, but NO Cruise...

So everything works as normal with the exception that you aren't able to maintain a set speed correct? If that's the case it sounds like the switch is doing it's thing and the PCM is sending the data to the IPC. You might have an issue under the hood w/ the cruise control module. I'm looking at 02 wiring diagrams which should be similiar to the 99 if it indeed is an 800 series truck....please verify.

It is the 99 Sierra SLE 5.3L Vortec... and that is correct cannot set speed which means it can't maintain it as well.

When you set the cruise the light in the IPC illuminates and if you hit the brake or turn the cruise off the light goes out correct? Just trying to make sure I'm reading you correctly LOL....if you hit resume does it illuminate again?

bossier62guy · July 17, 2010

Do this first before we get into wiring....pop the hood and make sure the cable that runs from the cruise control module (mounted on the right side of the firewall) to the throttle body is connected.

xzz0195 · July 19, 2010

What's are best practices for troubleshooting a cruise control?

Fuses, and this may sound crazy, but on some years if you have tail lights out the cruise will not engage. Please be more specific with the problems if possible.

Was driving the other day and cruise was working, then went into a shop, returned got on highway cruise was not working. Attempted to switch it on and off many many times (while driving), push button to set cruise many times, cruise light comes on, but NO Cruise...

So everything works as normal with the exception that you aren't able to maintain a set speed correct? If that's the case it sounds like the switch is doing it's thing and the PCM is sending the data to the IPC. You might have an issue under the hood w/ the cruise control module. I'm looking at 02 wiring diagrams which should be similiar to the 99 if it indeed is an 800 series truck....please verify.

It is the 99 Sierra SLE 5.3L Vortec... and that is correct cannot set speed which means it can't maintain it as well.

Found the root cause of this problem, this weekend. When I was doing the fuel pump work, I had pulled the Cruise Control connection off of throttle body to see if I could adjust the horizontal throttle bar (which I found it cannot be adjusted)...

Anyway the plastic clip that hold the CC to the TB (throttle body)... was damaged when I took it off first time, it had subsequently come off again, while driving. I reattached and put in a little ingenuity to hold it this time (duct tape)... Until I can get a new cable for it which would include the plastic holder...