2006 GMC sierra no start no crank no gearshift indicator change says reduced power and it was idling got overheated and problem started

Bruce Bracey

• 1000 Answers
• Posted on Apr 30, 2009

SOURCE: 99 GMC Sierra Pickup: Crank but no start. starts

The theft light issue is a good observation. Have you replaced the key tumbler or an ignition component lately? Has there been a lightning storm close very recently?

What the flashing security light is indicating is an attempt to relearn the key you are using.
Turn the key to run position, allow light to flash for 10 minutes, when light stops flashing turn ignition to OFF position for 5 seconds, turn ignition to run position and start over. Do this for 3 consecutive cycles, the the theft system will relearn the key cylinder code and store it once again.
Try that first before you go any further.
Let me know what you find.
Regards,

SOURCE: 2002 gmc sierra starts up runs then starts to idle

GMC's are notorious for fuel pump problems. Not an easy repair. You have to drop the fuel tank to replace. About an $700-800 job at the dealer.

SOURCE: 96 gmc sierra hard to crank after 12-14 hours

that has a votec engine in it the fuel pressure is droping at knight and it takes 60 psi before the injectors will fire most likely cause fuel pump ,leaking injector ,or a feul pressure regulator

SOURCE: 2000 gmc starts but then idles rough then dies

I had to replace the mass air flow sensor. $ 150. the engine would shut off when driving too.changed fuel filter only worked for a day. The sensor is just after air filter.

SOURCE: my 2000 gmc sierra won't start. changed the

Just maybe it's mechanical.Internal to the steering column is an activator rod that manually makes the contact in the ignition switch.It's the cast piece that is molded to the activator rod that breaks.Two things you can do;tilt the steering wheel all the way up and try again to start(the cast piece spreads before it breaks,by tilting you gain a little extra throw on the switch).This will only work a couple times before complete failure of the casting.The other is to move the cover that's just below the tilt lever enough to get to the rod and move it with a pliers to start.If it's mechanical these things do work,I ran my truck with a vice grip for a couple weeks until I could get the parts for the repair,but replacing the broken part is smarter and won't scratch up your column like mine.