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Old 08-20-2019, 07:37 PM
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Jeep Starting issues

Ok, I'm sure this has been asked before but I wanted to bring up an issue I have been experiencing. I have no check engine light on my dash. My jeep has left me stranded twice. I have tried starting it after driving it and it starts up runs about 3 seconds and dies. Do it over and over with the same result. Took it to my mechanic twice. Once he said my head unit (stereo) had burnt wires. Repaired it and it started up. Second time he tells me he disconnected the amp and started back up. So, I'm assuming that this is an anomaly and maybe he disconnected the battery twice and that's what caused it to start back up. Several times the jeep shakes a bit like it wants to shut off and the coolant gauge goes to the red with the check gauges light then drops to n ormal temp and jeep runs fine. What can that be? Why could this be happening? Mechanic tells me its not the key. I mentioned the crank position sensor and he ruled it out since there is not check engine light.

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Old 08-20-2019, 07:38 PM
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FYI, my TJ is a 2000

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Old 08-20-2019, 10:27 PM
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Anyone?
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Old 08-21-2019, 10:52 AM   #4
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Check the fuel pressure. Also check the ASD relay cause that happened to me once. The jeep would just die on me after a certian amount of time. Then it would crank and crank. LEt it sit for an hour and jeep would start right up. Swap ASD with horn and see if it dies on you.
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Old 08-21-2019, 11:30 AM
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My jeep cranks and starts up runs 2-3 seconds then dies. Have waited till the next day and the same thing would not stay running. Right now is running fine. Drove it to work and back around 80 miles and no starting issue but I know is just a matter of time before it acts up again. Whatever it is appears to be electrical because upon battery disconnection it starts up again. Almost seems that the computer resets the starts. I feel like its a sensor but not sure.
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Old 08-21-2019, 11:58 AM   #6
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It almost sounds like the Sentry Key Immobilizer Module (SKIM) is keeping the Jeep from running. It could be the module but more likely the chip in the key is failing.

When you turn on the ignition (just on, not start) do you see an illuminated image of a key in a circle with a slash through it? It should only stay on for a few seconds. If you see that light come on, you have the sentry key. Another give away is the head of the key is gray not black. Now with age and use and body oils from our fingers, the gray keys get very dark to almost dark brown but are still not black.

If you have a second key, try using that for a while and see if the problem persists.

If it is the key and the chip is failing, you will not see any codes as the system is operating normally. If they chip does not respond to the module with a valid code, then the engine will start, run about 3 seconds and shut down. You get a limited number of tries before it will simply not start at all for a time.

Solution - the best solution is to find a locksmith who programs chipped keys and take the Jeep to him. They can cut and program a new chipped key. I had one done locally here a couple of years ago and it cost me $71. You should need your DL and the registration of the Jeep. This is to make sure you are who you say you are and are the legal owner of the vehicle. My local dealer quoted me $150 to do it.

You cannot simply unplug the SKIM module as the PCM is looking for it. If you remove the SKIM to leave it off, you must have the PCM reprogrammed.
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Old 08-21-2019, 06:52 PM
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The mechanic ruled out the key. Also, I can verify right now because the jeep is running fine for now. I suspect the key or crank sensor but Im not sure at this point. Im confused about the stereo and amp. Mechanic claims two burnt wires on my stereo fixed the issue. Then he says ge disconnected the smp the second time and jeep started up right away. Im sure both times battery was disconnected even though he claims he did. not.
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Old 08-21-2019, 06:53 PM
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I cant verify sorry
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Old 08-21-2019, 06:54 PM
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Fyi, I do have a gray key and for now light turns on and goes away
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Old 08-22-2019, 08:34 AM   #10
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The next time it runs and dies, check the SKIM light on your dash.

Then use your second key and see what the result is. Your primary key could be intermittent which would show good at times and bad at times.
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Old 08-22-2019, 11:59 PM
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rgreen I will check it out next time. If it is the key, if I disconnect the battery will the computer reset and cause the key to read again? FYI I only have one key
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Old 08-23-2019, 12:18 AM   #12
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No. If the chip is failing, it will fail completely and nothing can restore it. It is the chip in the key that causes most issues. The module could fail, but even that can't be reset by touching the battery cables. In that case, you would need to replace the SKIM module.

I sold my 2006 Dodge 2500 Cummins to a friend who needed it for his business. He had borrowed it anytime he has a load his GMC 1500 wouldn't handle. Consequently he had one key and I had the other. When I sold him the truck, I asked him if he wanted the second key and he said to just hang on to it.

About two years later I get a call from him and neither the remote buttons would work and when he tried to start the truck it would start and die. He thought it was the battery (which would be correct for the remote buttons, but not the start function). He had already tried new batteries (walked over to a convenience store that actually had the right battery). He was two hours away. I had a meeting that night so his dad came by and got the spare key. Once he had the spare key, everything worked.

When he got back he went by a local locksmith to get a second key. The locksmith did not have a key with the remote buttons, but did have the gray headed key. He had that one programmed. He can unlock the truck with the physical key with no issue since it does not have an alarm. The cost for the key was $71. I went over a few days later and had one made for my TJ. (I had one with the Jeep logo, probably original, and one with the Pentastar logo, probably cut by a dealer).

If I owned your Jeep, I would get a second key cut very soon. Here there is only one locksmith that does it, but he is reasonable (dealer wanted $150). You should be able to find many locksmiths in your area. Call around and get the best price. Be prepared to present your DL and registration to them. The DL identifies you and the registration should have the same name and address and will be used for the VIN. They have to call in and get a code. Then they cut the key and go out to the Jeep, plug in a computer specialized computer and program the key.

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