Starting Issues

bowtieboy89 · July 11, 2009

i ve got a 2000 gmc k2500 with a 6.0L it will fire then die and i used to be able to give it some throtle and keep it runnin then after a couple minutes it would be fine but it didnt always do it now it jus fires and dies i preformed the procedure thats supposed to reset the securety light cause it was on and that will get me 3 to 5 good starts and then back to the same problem fuel pressure and spark are good i dunno where to go next

bill190 · July 11, 2009

For this problem I would suggest you take your vehicle to a GM dealer for service.

(Lots of electronics and electrical testing involved.)

bowtieboy89 · July 11, 2009

ive known the service manager at my local deler several years and he said if itll start why are you worried bout it

REV353 · July 11, 2009

Is there a check Idiot light on?

bowtieboy89 · July 11, 2009

the only light thats on is the securety light in the message center

REV353 · July 12, 2009

we had a 02' Malibu that the security system armed itself about once a month. some times it took 2 or 3 tries to get it shut off. We finally just got rid of the thing.

ColoradoSkiCountry · July 12, 2009

Hello Mark,

I'm afraid that your likely going to need the security module replaced. Seemed to be a frequent problem with the 99-2003ish models. My previous company truck, a 2000 GMC Sierra had the same issue, the security light would come on and it would crank and act as though it were going to start but then die right away. A trip to the dealer and some troubleshooting by them led to them replacing the security module as well as a new set of keys. Some of the security systems have chips inside of the key as part of an Anti-theft device.

bowtieboy89 · July 14, 2009

the truck runs now i disconnected the bateries over night but the secerity light is still on i put a snap on scan tool on it and there wasn t any codes and everything checked out ok how hard is it to change that modu and where is it located is there a way to test it

bill190 · July 14, 2009

A factory service manual set for your year/model vehicle (which you can order from your GM dealer or Helm Inc.), would have a complete description of how this operates, wiring schematics, and detailed troubleshooting/replacement instructions. You could do some troubleshooting with a multimeter.