Truck will not start from time to time

[Midnightrider]

I have an 06 colorado Z-71 crewcab 4x4. Every once in a while (maybe 3 to 5 months) My truck will not start.It will crank and turn over just fine.But will not start as if its not getting any fuel.Had it at a local chevy dealership could not find any problem with it. When you leave it set for about 10 minutes or so and try it again it will start and be fine for several months before it happens again. Any one every had this problem or heard of anything like this??

[DBNissan]

Sounds like something is triggering the Passlok system to activate.

[Custodian]

I believe DB is correct. Next time the problem occurs, check the dash for a flashing Passlock icon.

[rangerbob]

Check the battery voltage.

[Midnightrider]

Thanks guys it just did it this morning and I checked on here and read your posts. When I went to check that it did start but that does make sense. Normally if you wait about 10 minyes or so it will start with no problem.Next time it does this I will know what to look for though .Thanks ...

[hauler]

I was have the same kind of issue the passlock was shutting me down often it got to the point of at least once a week..
I stoped by my local GM dealer and the service writer printed me out a way to reprogram body control module .. keys or sensor with out going back to service dept. .. I was going to get a new switch and passlock sensor... he said first to reprogram old keys and sensor mighe be a glitch in firmware.... but before I did I decided to remove the bundle of keys from the key ring knowing the earlier GM key tumblers had an issue with over loaded weight on the ign key ring....I did this and I have not had a passlock problem since ....It has been three months...i put the print out in the glove box carry it with me just incase.... the extra weight may miss aligh key and not let the sensor read the key correctly!! over the long haul the weight will wear out the key slot and tumblers sure did on earlier GM models!!!

Retired fleet mechanic...

[superflae2002]

ive had the exact same problem, 3 times in the past week to be exact

[alkaspeltzar]

I had the same problems with intermittent starting. Brought mine to the deal for throttle body work, all the new PCM updates, new battery, new plugs. You name it, it was there like 8 times. Finally I bumped into a guru at the dealership, he suggested replacing the crack and cam position sensors, since when they fault, they don't necessarily throw a code since the truck isn't running yet.

30,000 miles later, never missed a beat. Take a look at those and replace them. Make sure your throttle body is clean too. They seem to like to build up carbon on the back side which can affect drivablity. Good luck

[Foutch137]

OK, to those of you that have had this problem. This started happening to me about a month ago and it has progressively gotten worse. I don't believe I have too much weight on the key itself but I'm experiencing the same kind of problem. The best way I can describe it is this: Key On Engine Off, I can hear the TB opening and closing just fine, however, when I go to start the truck...the only temporary fix I have stumbled upon is rapidly feathering the throttle until I get a very harsh start(shaking, backfiring). If this fails, I'm stuck waiting for 10-20 minutes(similar to Midnightrider) and then I'll try it again. All of my mods are listed in my signature if you guys think that any of them may have a hand in this. Thanks for any help.

p.s. I'm exactly sure where the "PassLock" system is....could you point me in the right direction if you believe this is the problem

[Custodian]

Here is a relearn procedure that I have never seen before.

http://chevrolet.justanswer.com/chevrol ... t-colorado

My problem went away when I stopped the habit of holding my keys between my teeth with my hands full. I believe I was jinxing the system by inserting the key into the ignition while it was wet.

Anybody else seen this relearn before?