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Amedee
Amedee, Jeep Technician
Category: Jeep
Satisfied Customers: 25441
Experience:  ASE certified Technician advanced level specialist. Wisconsin certified emissions state inspector
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I have 2005 grand cherokee and its very dumb. it starts

Customer Question

i have 2005 grand cherokee and its very dumb. it starts sometimes all the gauge dont work all thelights come on a much more
Submitted: 1 year ago.
Category: Jeep
Expert:  Amedee replied 1 year ago.

Hello and welcome! My name is ***** ***** I can assist you with your question. Are you saying sometimes it does not start? Does it crank over and not start or does it not even crank over at all? Can I start by getting your VIN or engine size?

Customer: replied 1 year ago.
HI
1J4HR58245C532329.
Its starts but doesnt turn on, sometimes it does but all the gauges dont work and the lights are all on.
Expert:  Amedee replied 1 year ago.

Thank you for that information. So does the starter engadge? Does it start and then stall out? Does the check engine light come on with the key on?

Customer: replied 1 year ago.
The problem is nobody can connect the computer tester to it. they cant check any codes
Expert:  Amedee replied 1 year ago.

Ok, this is most likley a bad PCM. Sometimes the cam or crank sensor will short out pulling the PCM off line so be sure to check those as well. If they check out good, all of the powers and grounds need to be checked going into the PCM with the key on. If they all check out good, the PCM is bad and will need to be replaced.

Expert:  Amedee replied 1 year ago.

I am glad I can help! Please dont forget to honor your good faith deposit by rating my answer as "excellent service" for assiting you today. Please let me know if you have any further questions.

Customer: replied 1 year ago.
But they have change also the pcm.
Customer: replied 1 year ago.
all cables.
Expert:  Amedee replied 1 year ago.

Ok, then they overlooked something.. most likely an input to the PCM like I mentioned.

Customer: replied 1 year ago.
But the both pcm i have do everything the same.
Expert:  Amedee replied 1 year ago.

Please call me so we can talk. I will explain everything.

Customer: replied 1 year ago.
you want me to pay another 10?
Expert:  Amedee replied 1 year ago.

YES, phone calls are extra.

Expert:  Amedee replied 1 year ago.

You will get so much more out of this conversation over the phone.

Expert:  Amedee replied 1 year ago.

I am waiting for your phone call

Customer: replied 1 year ago.
I have had it with 4 diffrent mecanics and the cant find the problem. how can you be so sure its the pcm?
Expert:  Amedee replied 1 year ago.

If the PCM was replaced, it obvioulsy is not the problem. I can explain everything over the phone.

Customer: replied 1 year ago.
just explain over a message
Expert:  Amedee replied 1 year ago.

Ok, no problem. If the PCM is not communicating and it has already been replaced, then it is either being shorted out (like I mentioned) or it is missing an input (like I mentioned)

Expert:  Amedee replied 1 year ago.

I am glad I can help! Please dont forget to honor your good faith deposit by rating my answer as "excellent service" for assiting you today. Please let me know if you have any further questions.

Customer: replied 1 year ago.
Are you sure about that? cause i think the mecanic i have it isnt that stupid that he miss that.
it has to be something else.
Expert:  Amedee replied 1 year ago.

I am positive

Customer: replied 1 year ago.
But why does it run sometimes if the pcm is working
Expert:  Amedee replied 1 year ago.

Because this problem is happening intermittantly.

Expert:  Amedee replied 1 year ago.

Sometimes the PCM is being affected.. and sometimes not.

Expert:  Amedee replied 1 year ago.

Therefore, it runs sometimes, and sometimes not.

Customer: replied 1 year ago.
si all i need it to replace the pcm and check the inputs?
Expert:  Amedee replied 1 year ago.

I am sorry but I dont understand you question. Can you please repeat it?

Customer: replied 1 year ago.
sorry.
So all i need is to replace the pcm and check the inputs?
Expert:  Amedee replied 1 year ago.

No, it does not work that way. You need to check the inputs first to see what it is missing and then go from there. Since it has been replaced already, it should not need to get replaced again.

Expert:  Amedee replied 1 year ago.

I am glad I can help! Please dont forget to honor your good faith deposit by rating my answer for assisting you today. It has been a pleasure working with you. Please feel free to request me in the future or request a phone call if you would like to speak on the phone.

Customer: replied 1 year ago.
But why would they do the same. can it run without a pcm?
Expert:  Amedee replied 1 year ago.

If the problem was the PCM, then no, it would not to the same thing when this happens. Because the PCM would have fixed the root cause. It does the same thing because the same problem is still happening. No, it cannot run without the PCM.

Customer: replied 1 year ago.
They change the complete engine wire harness from a 2006 and put it on my 2005.
Could that be a problem?
Expert:  Amedee replied 1 year ago.

YES, that is a possibility

Customer: replied 1 year ago.
That could do the same?
Expert:  Amedee replied 1 year ago.

I am sorry but I dont understand your question?

Customer: replied 1 year ago.
First you said my problem was my pcm. can the wire do thesame?
Expert:  Amedee replied 1 year ago.

YES, the wiring can do the same.

Customer: replied 1 year ago.
now what should i do?
Expert:  Amedee replied 1 year ago.

The same thing I have been telling you. Check the inputs to the PCM when this happens.

Customer: replied 1 year ago.
What do the inputs have to do with that?
Customer: replied 1 year ago.
My mecanic will check them soon.
Expert:  Amedee replied 1 year ago.

The inputs power up the PCM. The PCM cannot work if it is missing an input.

Customer: replied 1 year ago.
The inputs are in excellent shape also the wire harness. The two PCM's are doing the same.
Expert:  Amedee replied 1 year ago.

Excellent! Please tell me which inputs were checked.

Expert:  Amedee replied 1 year ago.

And of couse the results/readings of the test.

Customer: replied 1 year ago.
He just told me they were 100 percent
Expert:  Amedee replied 1 year ago.

You need to get more details.

Customer: replied 1 year ago.
The voltage from each post when turn on?
Expert:  Amedee replied 1 year ago.

YES, at least the powers and grounds.

Customer: replied 1 year ago.
What should the be?
Expert:  Amedee replied 1 year ago.

Full battery voltage and good grounds going in. Your mechanic should know this.. especially if he just got done telling you they are "100%"

Customer: replied 1 year ago.
Ok. Can you tell me what every wire should Show?
Customer: replied 1 year ago.
i can ask him.
Customer: replied 1 year ago.
The key has to be swith on ,right?
Expert:  Amedee replied 1 year ago.

You know we could have covered this hours ago over the phone. YES, I can tell you.. give me a bit while I gather this info

Expert:  Amedee replied 1 year ago.

In addition, he should have checked this if everything was "100%"

Expert:  Amedee replied 1 year ago.

The powers are pins 11, 12 and 29. This is on the C1 connector at the PCM.

The grounds are pins 9, and 18. This is on the C1 connector at the PCM.

Expert:  Amedee replied 1 year ago.

The PCM should NEVER be replaced EVER EVER EVER be replaced without these inputs checked and verified as good. This needs to be done BEFORE the PCM gets replaced.

Expert:  Amedee replied 1 year ago.

Based on what your telling me, (or not telling me), this was NOT done.

Expert:  Amedee replied 1 year ago.

Something tells me that I or both of us is not getting the full story here.

Expert:  Amedee replied 1 year ago.

OR the mechanic simply did not follow through properly and check these things before the PCM was replaced.

Expert:  Amedee replied 1 year ago.

I dont know because I am not there. You will need to ask him the inputs he checked. If he hesitates for a minute, then I would be very suspicious/skeptical of his diagnose skills.

Customer: replied 1 year ago.
I just told him if he could check the inputs out. So he just told me that.
Customer: replied 1 year ago.
I asked him about the testing the power and grounds. lets see what he will say.
Expert:  Amedee replied 1 year ago.

If the PCM is not communicating and it has been replaced, provided the new one you got it good, but the PCM is still not communicating, then the PCM is missing an input. It is as simple as that. I will be looking forward to your reply!

Customer: replied 1 year ago.
Ok. Is the fan somehow connected to that too cause if it runs after a little while it turns on like crazy?
And the alarm goes on ones i connect the battery.
Expert:  Amedee replied 1 year ago.

YES

Customer: replied 1 year ago.
If there should be a missing input is that why they cant connect a diagnose tester?
Expert:  Amedee replied 1 year ago.

Lol, yes, that is what I have been trying to tell you since 9 AM this morning.

Customer: replied 1 year ago.
Ok ill wait for the Mecanic or whatever you call him to get back to me.
He's 4 hours away from here thats why i cant do it myself.
I havent use my cherokee for about a year now because nobody can find the problem.
Expert:  Amedee replied 1 year ago.

Sounds like a plan. Now will you rate my service?

Customer: replied 1 year ago.
If ill rate you our commication is over?
Expert:  Amedee replied 1 year ago.

No, we can still continue this conversation even after you rate my answer.

Expert:  Amedee replied 1 year ago.

Hello! It's Amedee from just answer. I am just checking in to see if you had a chance to speak with the mechanic?

Customer: replied 1 year ago.
No. He hasnt responde yet.
Expert:  Amedee replied 1 year ago.

Ok, sounds good. Keep me posted.

Expert:  Amedee replied 1 year ago.

Hello!

It's Amedee from just answer. I am just checking in to see how things turned out and if you need further assistance. Please let me know.

Amedee

Expert:  Amedee replied 1 year ago.

Hello!

It's Amedee from just answer. I am just checking in to see how things turned out and if you need further assistance. Please let me know.

Amedee

Customer: replied 1 year ago.
hi finally back.
He checked it out and it seems to be just like you told how they should be.
Expert:  Amedee replied 1 year ago.

"Seems"? Something is being overlooked. Please accept my offer and call me

Customer: replied 1 year ago.
If i tell you something you dont believe me anyway so why continue.
Expert:  Amedee replied 1 year ago.

We will be able to communicate better over the phone

Customer: replied 1 year ago.
I just want to know my problem after a year.
The inputs are good the power and the grounds.
Expert:  Amedee replied 1 year ago.

Ok, was the BUS circuit checked?

Expert:  Amedee replied 1 year ago.

Hello??

Expert:  Amedee replied 1 year ago.

How am I supposed to help if you dont respond back?

Expert:  Amedee replied 1 year ago.

Obvioulsy the BUS circuit has not been checked.

Expert:  Amedee replied 1 year ago.

At least not correctly. If it were, then a diagnoses would have pinpointed the problem.

Customer: replied 1 year ago.
Which bus cricut?
Customer: replied 1 year ago.
hello??
Expert:  Amedee replied 1 year ago.

All of them

Customer: replied 1 year ago.
tell me how those are checked and ill asked him
Expert:  Amedee replied 1 year ago.

With a lab scope

Customer: replied 1 year ago.
i dont think he has one of those
Customer: replied 1 year ago.
Can it be test somehow without that thing?
Expert:  Amedee replied 1 year ago.

Hello and sorry for the delay! A good driveablity tech should have a lab scope. However, if not, then he will need to use a scanner and check for communication to all modules on board the vehicle. Most likley he will find an issue with more modules than just the PCM. Again, your mechanic should know all of this.

Expert:  Amedee replied 1 year ago.

A lot of times the instrument cluster itself goes bad causing both of these issues.

Expert:  Amedee replied 1 year ago.

And if your mechanic has been in the business for a while, he would know that this is a very common issue on these vehicles.

Customer: replied 1 year ago.
He's doing mostly manual. So will call him up and see what going on
Expert:  Amedee replied 1 year ago.

ok

Expert:  Amedee replied 1 year ago.

Hello! It's Amedee from just answer. I am just checking in to see how things are going and to see if you need any further assistance?

Customer: replied 1 year ago.
Hello. sorry for the delay. I been busy. I will switch mecanic theses days. But till now i got nothing.
Can i fix it myself?
Expert:  Amedee replied 1 year ago.

YES, it is possible to fix it yourself. However, it may not be easy to diagnose and fix depending on what is wrong with the vehicle and what tools you do or do not have access to..