GM Truck Club Forum banner
1 - 19 of 19 Posts

·
Registered
Joined
·
6 Posts
Discussion Starter · #1 ·
I have a 2003 Tahoe z71 with approximately 125k miles. Lately, I've been having intermittent starting problems. Sometimes when I get in the vehicle and go to start it up, I turn the key to "on" and all the electronics come on as normal but when I go to crank it, nothing happens... no sound at all coming from under the hood, and the electronics all go out (which I think is normal) while the key I turned. I have to turn the key off and on and keep trying several times. Sometimes it takes 30 seconds, sometimes up to 10 minutes before the engine will crank... and when it does it sounds perfectly normal, not like a low battery or anything. I read on another board to check the transmission neutral sensor as it may be messed up and thinking the cehicle is in gear. It reads that I am in park, and I've even tried shifting to neutral and trying to start, but no change. Also, as weird as it sounds, it seems to have this problem mostly after the vehicle has been parked in the sun for a few hours. Not sure if its coincidental or actually related to the problem. Also tried using my spare key as the dealer said my key may be worn out... tried that but still have the problem. Any ideas???? Typed this from a phone so I apologize for any misspellings... thanks in advance for any advice.
 

·
Registered
Joined
·
337 Posts
I would check that sensor myself, you mentioned.

Also, while doing that I would make sure that your grounds are good, and check for any corrosion....

But I think the sensor would be the best place to start

Might also be your ignition, something else to consider.
 

·
Registered
Joined
·
2 Posts
My '03 Z71 Tahoe (150K) has been exhibiting the same symptoms to a "T". I have checked the neutral safety switch - it is not that. Last night it would not start (as described by John_03z71, but this morning, without touching the shifter (or even being in the truck) it started first turn - this would seem to lobby against it being an ignition SWITCH issue. This has been a phantom issue for at least 10 months - it throws no codes either.
If anyone has had this issue and SOLVED it, please chime in.

Thanks!
 

·
Registered
Joined
·
6 Posts
Discussion Starter · #4 · (Edited)
I ordered a neutral safety switch last night so I will keep you updated if it fixes anything. On Wednesday, the problem was so bad that it took about 40 minutes until the truck decided it wanted to crank... When it finally decided to crank the battery was dead from all the attempts and fuel pump buzzes that I had to ask for a jump. Ever since then, it has started up on the first try. So aggravating............. like I said, I will see if this neutral safety switch changes anything and let you know.

Also read somewhere to check/replace the starter solenoid, but the fact that there is no 'click' when the issue arises tells me that its not the problem part, correct? Or is it possible for a faulty starter solenoid to make no sound and only fail intermittently like this?
 

·
Registered
Joined
·
6 Posts
Discussion Starter · #5 ·
Update: just went to crank it and had the problem again. After about 2 or 3 minutes of trying to get I to crank, when I turned the key forward to crank it nothing happened (like the rest of the tries) but then when I let go and the key moved back to the 'on' posiytion, after about 1 second the engine cranked by itself without my fingers even on the key. Also, when it did crank up all my gauges are now dead. The lights all come on in the cluster but none of the 6 gauges work. What is going on?????
 

·
Registered
Joined
·
337 Posts
Have you replaced the ignition?

Kinda also sounds like a short some where.....some exposed wire is grazing something.
Or some loosely connected wires.....

Maybe start fishing around under the dash, checking all the wires and tracing them to their connecting points.
 

·
Registered
Joined
·
6 Posts
Discussion Starter · #7 ·
Sorry I wasn't too clear, no I haven't replaced the neutral safety switch yet, it just got delivered. Also, just got back in the truck a few hours after the gauges failed and they are working again... weird. Anyways, I will replace the switch tomorrow and see if the problem persists. If so, any ideas on what to try next? Ignition switch, CPS, ?? Thanks again for your help!
 

·
Registered
Joined
·
337 Posts
I would maybe try ignition next.

But man, anytime I have had a weird issue with my truck (things work one time and not the next time), it has usually come down to a loose/floating ground....

So I would really take the time to look over your wires (check for bare wires or loose wires) and also check your grounds.

If you can, maybe get a Chiltion's manual that has a wiring diagram and look to see where the wires go, and get a multimeter to check the wires for continuity.
 

·
Registered
Joined
·
6 Posts
Discussion Starter · #9 ·
Partsgeek.com sent the wrong part so I had to order a neutral safety switch from another place. BTW, never order parts from them, must have called customer service 20 times with no answer and sent 3 emails with no response. Now I see they have an F rating with the BBB. Had to open a dispute with my bank. Anyways, will keep you updated whenever I receive the correct part and install it.

Kurtibm, any luck fixing yours?
 

·
Registered
Joined
·
36 Posts
Try cleaning the battery cables, remove them from the battery and clean them with a wire or fiber brush, even if they look clean. Do like MightyMax suggests and go over the wires and the grounds. Check the wires at the starter and the ground from the engine to the chassis and to the battery. Go to the troubleshooting guide in the Chiltons. Troubleshooting is the key here, not replacing parts, that can get expensive very fast. Some of the best troubleshooting books are the Mitchell Manuals. See if you can access them online or go to your local library to find one. Have you checked the codes? Maybe something will show up there too. Good luck.
 

·
Registered
Joined
·
2 Posts
Mine ended up being the starter. The way I isolated the issue was to have someone in the car holding the key in the 'crank' position (turned all the way clockwise) while I hit the starter with a hammer. After 2-3 hits it started right up.
I'm not saying that this will fix ALL trucks exhibiting this/these symtoms, but it was the problem with mine.
 

·
Registered
Joined
·
1 Posts
This seems to be a common problem i am seeing with gm trucks. You are having a problem with the security system on your trucks two common causes are the halo wires on the ignition switch which sends a resistence signal specific to your vehicle to the bcm (body control module). These wires will break at the ignition switch. pull off the knee panel and look for two small gauged white wires wraped in an orange wrap. try wiggling these wires as you try cranking the engine. Another problem is the bcm which controls the security and the halo (passlock sensor). there should be a red/white wire with 12v and a yellow wire with 5v that changes when you rotate the key to the start position. This problem does trigger a code in the bcm it will not turn on the check engine light though. the codes maybe b2947, and b2958. Make sure there is proper voltage to the bcm (12v) as you turn the key from off to start. If you lose voltage repalce the ignition switch. If you don't replace the bcm.
 

·
Registered
Joined
·
1 Posts
I am having the same problem and it’s been going on for about a month. I’ve replaced the ignition switch (with no change) took it to Chevy put a new ignition cylinder in it (still no change) like you stated when it starts to get warm outside it’s through. It will not give a code and Chevy says they have checked it through out the day and no problem starting and at $145/hour I can’t keep pouring more money into it. I’ve checked grounds, shook wires all over (under the seat, hood, by fuse box, under dash, and around the steering column to no prevail. Any updates?
My '03 Z71 Tahoe (150K) has been exhibiting the same symptoms to a "T". I have checked the neutral safety switch - it is not that. Last night it would not start (as described by John_03z71, but this morning, without touching the shifter (or even being in the truck) it started first turn - this would seem to lobby against it being an ignition SWITCH issue. This has been a phantom issue for at least 10 months - it throws no codes either.
If anyone has had this issue and SOLVED it, please chime in.

Thanks!
 

·
Registered
2000 Silverado Z71 4x4 5.3L 460k+ miles w/ GM rebuilt motor and trans
Joined
·
1,469 Posts
I am having the same problem and it’s been going on for about a month. I’ve replaced the ignition switch (with no change) took it to Chevy put a new ignition cylinder in it (still no change) like you stated when it starts to get warm outside it’s through. It will not give a code and Chevy says they have checked it through out the day and no problem starting and at $145/hour I can’t keep pouring more money into it. I’ve checked grounds, shook wires all over (under the seat, hood, by fuse box, under dash, and around the steering column to no prevail. Any updates?
For those wondering where the new post went, it was blended into the reply. I've pulled it out here.
 

·
Registered
Joined
·
2 Posts
Has anyone got this issue figured out?? Same thing is going on with my 03 Tahoe and is driving me crazy

I have a 2003 Tahoe z71 with approximately 125k miles. Lately, I've been having intermittent starting problems. Sometimes when I get in the vehicle and go to start it up, I turn the key to "on" and all the electronics come on as normal but when I go to crank it, nothing happens... no sound at all coming from under the hood, and the electronics all go out (which I think is normal) while the key I turned. I have to turn the key off and on and keep trying several times. Sometimes it takes 30 seconds, sometimes up to 10 minutes before the engine will crank... and when it does it sounds perfectly normal, not like a low battery or anything. I read on another board to check the transmission neutral sensor as it may be messed up and thinking the cehicle is in gear. It reads that I am in park, and I've even tried shifting to neutral and trying to start, but no change. Also, as weird as it sounds, it seems to have this problem mostly after the vehicle has been parked in the sun for a few hours. Not sure if its coincidental or actually related to the problem. Also tried using my spare key as the dealer said my key may be worn out... tried that but still have the problem. Any ideas???? Typed this from a phone so I apologize for any misspellings... thanks in advance for any advice.
Did you get this fixed? I'm having same issue
 

·
Registered
Joined
·
2 Posts
Has anyone got this issue figured out?? Same thing is going on with my 03 Tahoe and is driving me crazy

I have a 2003 Tahoe z71 with approximately 125k miles. Lately, I've been having intermittent starting problems. Sometimes when I get in the vehicle and go to start it up, I turn the key to "on" and all the electronics come on as normal but when I go to crank it, nothing happens... no sound at all coming from under the hood, and the electronics all go out (which I think is normal) while the key I turned. I have to turn the key off and on and keep trying several times. Sometimes it takes 30 seconds, sometimes up to 10 minutes before the engine will crank... and when it does it sounds perfectly normal, not like a low battery or anything. I read on another board to check the transmission neutral sensor as it may be messed up and thinking the cehicle is in gear. It reads that I am in park, and I've even tried shifting to neutral and trying to start, but no change. Also, as weird as it sounds, it seems to have this problem mostly after the vehicle has been parked in the sun for a few hours. Not sure if its coincidental or actually related to the problem. Also tried using my spare key as the dealer said my key may be worn out... tried that but still have the problem. Any ideas???? Typed this from a phone so I apologize for any misspellings... thanks in advance for any advice.
Did you get this fixed? I'm having same issue
 

·
Registered
Joined
·
346 Posts
Or hit it with a 1 inch wrench a few times like I did in college till I could get enough money to buy a new starter 😂
 
1 - 19 of 19 Posts
Top