GM

GM repair problems? Ask a GM repair expert now.

Ask an Expert,
Get an Answer ASAP!

I have a 08 Malibu LT 2.4 liter that will not start from the…

Customer Question
I have a 08 Malibu...
I have a 08 Malibu LT 2.4 liter that will not start from the ignition what I did notice is that when you turn the key on the fuel gauge goes up and then comes down to empty and when you turn the ignition key trying to start the vehicle the dash lights and radio lights go out until the key is released the battery and starter both are good I checked the starter relay that was okay and jump-started the vehicle from the relay port to check the starter that was okay I also tried moving the shifter in different ranges to check the neutral safety calibration I also checked all three fuse boxes in the vehicle all the fuses were good and I remove the ECM from a vehicle that was running that had the same part number as mine installed it and the vehicle still did not start
Submitted: 8 months ago.Category: GM
Show More
Show Less
Ask Your Own GM Question
Answered in 58 minutes by:
10/7/2017
GM Mechanic: Gabriel Grey, ASE Certified Technician replied 8 months ago
Gabriel Grey
Gabriel Grey, ASE Certified Technician
Category: GM
Satisfied Customers: 447
Experience: Master Service Technician
Verified

Good morning, my name is***** am a GM master certified mechanic and would be happy to assist you with this.

Have you verified that there is fuel in the tank? If the gauge is showing empty then it is highly likely we have a fuel issue going on. Can you hear the fuel pump turn on when you turn the key? Do you have access to a fuel pressure tester?

Ask Your Own GM Question
Customer reply replied 8 months ago
What I have is electrical problem I have a half a tank of fuel and a fuel pump is working the engine does not crank over the starter is fine I tested it I jumped it out the starter relay is okay the battery is new from my understanding this vehicle starting system is tied into the ECM I interchange the ECM from another vehicle with the same part number the vehicle still does not crank from the ignition key I move the shifter range selector two different positions just in case the neutral safety calibration was off still no effect of starting
GM Mechanic: Gabriel Grey, ASE Certified Technician replied 8 months ago

Have you been able to find out if you have any trouble codes stored?

If the engine is not turning over that means we either have a fuel or a spark issue. We will need to check for fuel pressure at the injectors, as well as spark output. The best thing to start with will being getting access to a scan tool and checking for any trouble codes. That will help us determine with the problem is originating

Ask Your Own GM Question
Customer reply replied 8 months ago
This is not a fuel problem or ignition there's no motion from the engine when the key is turned to crank over the starter as I stated the starter is okay the starter relay is okay I even changed out the ignition switch and still no motion from the starter I bypass the starter to test it which is okay the relay is okay brand new battery and as I stated from my understanding that the starting system goes through the ECM wish I did change out the ECM with another one from a vehicle that was running
GM Mechanic: Gabriel Grey, ASE Certified Technician replied 8 months ago

My apologies, I missed the part where you said there was no crank, I thought that it was cranking but not turning over.

Since you have already replaced the ignition switch that does make me think there is an issue with the module programming/anti-theft system. The new ECM has to be programmed to your vehicle, even if it was taken from a similar vehicle due to the fact that the ECM saves and stores info for the anti-theft system. Your key has a chip inside of it with a specific code, and that code gets paired to the module, if the module is not programmed when it is installed then it is never able to recognize the key, therefore when you turn the ignition switch it is recognizing that as an attempted theft and disables the vehicle.

Ask Your Own GM Question
Customer reply replied 8 months ago
how did the original module lose its program the vehicle was running fine went went in the store came out and no start battery and starter both were ok if this is a anti theft programming problem how will I be able to identify that befor having it reprogrammed
GM Mechanic: Gabriel Grey, ASE Certified Technician replied 8 months ago

Electrical faults usually present themselves at pretty surprising moments, and unfortunately there are not many ways to be ready when they happen.

The original fault could still be related to the ECM, but since the ECM was swapped it is possible that the new ECM has inhibited starting, so we have no way to tell if that is the issue or not until it is programmed and communicating with the vehicle.

Personally, if it was a car that I had in the shop I would swap the ECM back to the original, and then get a scan tool and see what is stored in the trouble codes. Doing it this way will ensure we are chasing the correct problem and not wasting time on something else. If there is no trouble codes then we will need to check for power/ground signal coming from the ECM to the ignition circuits

Ask Your Own GM Question
Customer reply replied 8 months ago
the first thing i did when the problem existed was checked for codes and there was no codes then I swapped out the ECM to see if that was the problem
GM Mechanic: Gabriel Grey, ASE Certified Technician replied 8 months ago

Ok, I am glad you were able to get the car scanned at least. Without any sort or troublecodes stored it makes this very difficult to diagnose through text and since you have already checked all the basics it looks like this will have to have some deeper diagnosis done in person, that way I am not just suggesting parts to throw at it. I am going to opt out of this question and reopen it to other experts who may have more information on this for you. Best of luck getting things running!

Ask Your Own GM Question
GM Mechanic: GM Bob, ASE Certified Technician replied 8 months ago
GM Bob
GM Bob, ASE Certified Technician
Category: GM
Satisfied Customers: 1,226
Experience: 30 plus years experience as GM technician, ASE Master Technician and GM Certified.
Verified

Hello my name is***** you still need help?

Ask Your Own GM Question
Customer reply replied 8 months ago
i still need help I'm not certain if Gabriel Greydanus forward u the info on are discussion regarding the roblem that i am having with the vehicle if not I'll start over from the beginning
GM Mechanic: GM Bob, ASE Certified Technician replied 8 months ago
With the key on what light are on the dash?
If you need to take a picture you can post it here
Ask Your Own GM Question
Customer reply replied 8 months ago
Lights on the dashboard or the brake light security light seatbelt light engine light
GM Mechanic: GM Bob, ASE Certified Technician replied 8 months ago
Have you done anything with the keys? How many keys do you have?
Ask Your Own GM Question
Customer reply replied 8 months ago
No I haven't done anything with the keys I have two keys
GM Mechanic: GM Bob, ASE Certified Technician replied 8 months ago
You have tried both keys?
Ask Your Own GM Question
Customer reply replied 8 months ago
I have tried both keys question when I turned the key to the store position All of the Lights on the dash and radio go out and the gauges go to full capacity and when I release the key the gauges return back down and the lights come back on does this mean anything
GM Mechanic: GM Bob, ASE Certified Technician replied 8 months ago
Have you put back in the original ECM?
Do you mean in the start position?
Ask Your Own GM Question
Customer reply replied 8 months ago
I have the original ECM back in the car which is doing the same exact thing as the one I changed it out and yes I mean in the store position
GM Mechanic: GM Bob, ASE Certified Technician replied 8 months ago
What is store position?
You have off/key on /cranking
Ask Your Own GM Question
Customer reply replied 8 months ago
My mistake I meant starting position which is the cranking position
GM Mechanic: GM Bob, ASE Certified Technician replied 8 months ago

The gauge and lights are operating normal.

You have had no work done on the car before this problem?

Ask Your Own GM Question
Customer reply replied 8 months ago
No work has been done to the car at all prior to this problem no more than an oil change that was done at the dealership the car was running fine i went in the store came out and it would not start the battery was good and the starter is there any way to determine if the security system is the problem
GM Mechanic: GM Bob, ASE Certified Technician replied 8 months ago

The security light should not be on.

You need a scan tool that can read theft deterrent module codes. Not all scan tools can.

You could try this.

Disconnect both battery cables and touch the together. This will reset all modules.

Ask Your Own GM Question
Customer reply replied 8 months ago
Resetting the module did not make any changes is there a possibility that it need reprogramming is there a schematic available for the starting system from the ignition switch to through the relays and to the module that I can check but first of all what is the easiest way to bypass the neutral safety
GM Mechanic: GM Bob, ASE Certified Technician replied 8 months ago

I think you have a security problem.

To diagnose this problem you need a scan tool.

Here is a link

https://www.dropbox.com/sh/z3nzlrgjv3floje/AAC5I7Oqiu-8HMSGthHQim24a?dl=0

Ask Your Own GM Question
GM Mechanic: GM Bob, ASE Certified Technician replied 8 months ago

Here is a schematic for the security system.

https://www.dropbox.com/s/7tl1o2jfnday31c/2008%20security%20schematic.pdf?dl=0

Ask Your Own GM Question
GM Mechanic: Gary, ASE Certified Technician replied 8 months ago
Gary
Gary, ASE Certified Technician
Category: GM
Satisfied Customers: 1,825
Experience: Senior Technician
Verified

Hello there,

I would say you have a dead ECM or no communication with the ECM.

The fuel gauge reading zero is because the ECM is not reporting the fuel level.

Fitting an ECM from another car like you have done won't work either because you have not unlinked it correctly from the donor vehicle first.

And then not linked to your immobilizer.

What you should done is have the car scanned by a GM dealer tech.

I don't believe there was no codes, you need to perform a vehicle wide scan, and a module presence check.

How far to your nearest GM dealer?

Gary

Ask Your Own GM Question
GM Mechanic: Gary, ASE Certified Technician replied 8 months ago

Hello again Herbert,

Do you need any further help?

I hope my advice has been of assistance to you.

Kind regards

Gary

Ask Your Own GM Question
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a gm mechanicLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask Gary Your Own Question
Gary
Gary
Gary, ASE Certified Technician
Category: GM
Satisfied Customers: 1,825
1,825 Satisfied Customers
Experience: Senior Technician

Gary is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

I was having a terrible problem with the wheel bearings on my 98 Chevy Cavalier and I suspect that using this website saved me plenty of time and money.

Todd LRochester NY

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

< Previous | Next >

Meet the Experts:

GM Tech (Cam)

GM Tech (Cam)

GMC Mechanic

5,838 satisfied customers

GM Grand Master Technician 2007. 14 years experience.

Gary

Gary

GMC Technician

1,560 satisfied customers

15 years gm master tech/15 years ASE master tech

car tech

car tech

ASE Certified Technician

449 satisfied customers

25 year master tech and shop owner

Chris (aka- Moose)

Chris (aka- Moose)

GMC Technician

232 satisfied customers

16 years of experience

Paul M ASE Master

Paul M ASE Master

ASE Master Tech

187 satisfied customers

ASE Master Tech 20+ Years

Anthony

Anthony

GMC Technician

489 satisfied customers

GM Certified

Amedee

Amedee

GMC Technician

470 satisfied customers

ASE certified tech with advanced level specialist. Wisconsin certified emissions state inspector

< Previous | Next >

Related GM Questions
Is there another website besides 'RockAuto.com' where I can
Is there another website besides 'RockAuto.com' where I can look up photos and prices of parts? I am having issues logging into this site. I am looking for a site similar to 'RockAuto.com'. Thanks for… read more
fordguy4u
fordguy4u
Automotive Tech
Vocational, Technical or Trade Scho
70 satisfied customers
Have 2010 traverse the dome lights wont shut off when doors
have 2010 traverse the dome lights wont shut off when doors are closed my scanner tells me the doors are shut but dome wont go off … read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
No power ignition switch wontgo to off position nothing will
No power ignition switch wontgo to off position nothing will workcan get it to shift from oak everything is stuck … read more
GM Tech (Cam)
GM Tech (Cam)
GMC Mechanic
Vocational, Technical or Trade Scho
5,838 satisfied customers
I need to replace the oil pressure unit on my 2007 H3. oil
I need to replace the oil pressure unit on my 2007 H3. oil levels and temps are good but oil light and warning bell come on. this does not happen every time I drive it. … read more
fordguy4u
fordguy4u
Automotive Tech
Vocational, Technical or Trade Scho
70 satisfied customers
I replaced the ignition switch car turns over and starts for
I replaced the ignition switch car turns over and starts for a second, but wont start and the outline of the hummer with a lock on it is on … read more
Chad Farhat
Chad Farhat
Owner
Associate Degree
5,323 satisfied customers
1997 gmc knocker wire broke. Were does wire from knocker
1997 gmc knocker wire broke. Were does wire from knocker sensor go to. … read more
Mechanic01
Mechanic01
2,813 satisfied customers
Have 2007 Hummer H2, oil pressure gauge stays spiked, oil
Have 2007 Hummer H2, oil pressure gauge stays spiked, oil temp gauge running a little high, engine light flashes at 4 RPM, got a P0300 code. Got a couple ideas where to start but wondering if this inf… read more
eauto
eauto
self employed
High School or GED
74 satisfied customers
I have a 2017 Denali Acadia that's been to GMAC dealer
I have a 2017 Denali Acadia that's been to GMAC dealer because when I go to put car in Park the bells keep going off and say put it in park! … read more
eauto
eauto
self employed
High School or GED
74 satisfied customers
Replace exhaust manifold. What is the torque pattern and ft
replace exhaust manifold. What is the torque pattern and ft lbs for the bolts … read more
Ron Z.
Ron Z.
Vocational, Technical or Trade Scho
2 satisfied customers
Key cylinder is getting stuck, and will not turn all the way
key cylinder is getting stuck, and will not turn all the way to start the truck … read more
TIM MOHR
TIM MOHR
SHOP OWNER
Master's Degree
8,037 satisfied customers
Ac clutch connector isn't getting any power. Why would that
what does a slipping clutch have to do with the sated problem? … read more
TIM MOHR
TIM MOHR
SHOP OWNER
Master's Degree
8,037 satisfied customers
Losing powe steering fluid ...hard to turn...put some in and
losing powe steering fluid ...hard to turn...put some in and turns smoothe now but still makes whinning sound...4 wheel drive lights won't work....Think its power steering pump. would that affect*****… read more
Jared D
Jared D
Shop Supervisor
Bachelor\u0027s
3 satisfied customers
2012 GMC Yukon XL Denali driver seat. I hear clicking in the
i hear clicking in the module that is under the seat when I move power seat buttons, but no movement … read more
GM Tech (Cam)
GM Tech (Cam)
GMC Mechanic
Vocational, Technical or Trade Scho
5,838 satisfied customers
2015 Escalade has leaked water a couple of times from the
2015 Escalade has leaked water a couple of times from the microphone thing directly Obote the driver. Is this common? What would be the fix?… read more
Richard Greer
Richard Greer
Vocational, Technical or Trade School
66 satisfied customers
I have a 2012 GMC Sierra and my check engine light says
I have a 2012 GMC Sierra and my check engine light says throttle body sensor needs replacing. I purchased one, and about to put it on. The guy at the auto parts store told me that I have to have it re… read more
Eric
Eric
Auto Technician
589 satisfied customers
Windshield installer is giving a quote that reads the
Windshield installer is giving a quote that reads the windshield needs a calibration for $400 after they install a $600 windshield on a 2015 Cadillac Escalade. What's this reprogramming fee all about?… read more
Richard Greer
Richard Greer
Vocational, Technical or Trade School
66 satisfied customers
At first the AC worked sometimes. Now it does not blow at
At first the AC worked sometimes. Now it does not blow at all but I feel cool air if im on the highway. The fan wont blow. I changed the resistor but it still does not work. … read more
Matt
Matt
Engineer
Bachelor\u0027s Degree
5 satisfied customers
Getting p0300 misfire on cylnder 6. 230,000 replace spark
230,000 replace spark wire on one plug I may to replace them all … read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
25 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x