Chevy

Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP

Ask an Expert,
Get an Answer ASAP!

GM carlo: 04 carlo, different pcm 5 yr,

Customer Question
04 monte carlo, different pcm...
04 monte carlo, different pcm for last 5 yr, need ign switch, then again in oct for the recall. Returned to stock including stock pcm, starts and runs 1sec stalls out, passlock issue, can not seem to get it to go into relearn
Submitted: 2 years ago.Category: Chevy
Show More
Show Less
Ask Your Own Chevy Question
Answered in 3 hours by:
6/7/2015
Chevy Mechanic: GM Tech (Cam), Chevy Technician replied 2 years ago
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 30,179
Experience: GM Grand Master Technician 2007. 14 years experience.
Verified
Hello, I'm Cam.
Can I get your first name please?
I will post the proper relearn sequence at the bottom, check that against what you are doing.
Also when you returned it to stock, was the pcm the original one or just a factory tune? I ask because we need to make sure the programming in the bcm matches the pcm in terms of the vin. If the pcm is programmed to one vin and the bcm a different vin, then it will never learn the theft system.
Turn the key on and attempt to start the car, It may crank, it may start and stall or it may do nothing at all, this is fine, still cycle the key to start then release the key back to run. Wait 10 minutes with the key in run. The passlock light should be flashing and the DIC will say "Service Vehicle" or "Security" or have a picture of a car with a lock during that 10 minute span. After 10 minutes has passed, turn off the car, count to 10, and try to start it again and release the key back to run. Wait another 10 minutes. After 10 minutes, turn car off 10 seconds and try to start again and release the key to run. Wait another 10 minutes. After 10 minutes, turn car off 10 seconds and try to start again. It should start up this time. The passlock has been learned. During this process, turn the fans off, radio off and cycle the headlights off so the battery will not go dead. If needed, use a battery charger.
Ask Your Own Chevy Question
Customer reply replied 2 years ago
It is the original pcm from the car and harness. Only things not original is the crank and cam sensor as short block are from a downer car, part numbers match and used my original short wire leads that connect to harness near ignition coils. The procedure you listed is one that I have tried but have deviated from slightly and not fully completed since when the car stalls and I leave it in the run position the security light dose not come on so I am unable to wait for it to go off. The light only comes on when you first move the key from off to run. I read somewhere you may need to delete and theft codes from the bcm for it to go in to the relearn mode, is this correct and can only a tec2 or snap on solas/modas turn off those codes?
Chevy Mechanic: GM Tech (Cam), Chevy Technician replied 2 years ago
You could try a reset by removing both battery cables and touching the ends together for 10 seconds.
Ask Your Own Chevy Question
Customer reply replied 2 years ago
So tried the reset but no change, after turning the key to start and fall to run the secrity light did not come on, still only comes on when moved from off to run and will not shut off, I am doing this with window open doors and trunk closed. Tried doing the relearn by time even without the light on but no change. Only thought I have is one thing I read that said in order to go into a relearn there can not be any security codes set in the bcm, they must be cleared first. Dose this sound correct? If so I have a friend with a good scanner that can stop by and read the bcm. My scanner only reads pcm and only code I am picking up is rear o2 since I dont have the exhaust hooked up fully, waiting on gasket. Other than that no codes coming up on the pcm side.
Chevy Mechanic: GM Tech (Cam), Chevy Technician replied 2 years ago
Ok, lets see what the full scanner shows.
Ask Your Own Chevy Question
Was this answer helpful?
Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 30,179
30,179 Satisfied Customers
Experience: GM Grand Master Technician 2007. 14 years experience.

GM Tech (Cam) 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)

Chevy Technician

30,179 satisfied customers

GM Grand Master Technician 2007. 14 years experience.

Gary

Gary

Chevy Technician

9,357 satisfied customers

15 years GM master tech

Tim&#039;s Auto Repair

Tim's Auto Repair

mechanic

8,866 satisfied customers

Have owned a repair shop for 25 yrs.

Dave Nova

Dave Nova

Chevrolet Technician

7,092 satisfied customers

ASE Master Certification. GM World Class Certification

John

John

Master A.S.E Automotive technician

4,071 satisfied customers

A.S.E MasterTechnician A1-A8 w/L1,38 years experience General Motors Master Technician

Don - Mo Lurch

Don - Mo Lurch

Auto Mech / Electronics

2,918 satisfied customers

Chevrolet Cert., Heavy Line Mech, Race Shop Owner, Mobile Electronics.

Ron Z.

Ron Z.

- Chevy Tech -

2,734 satisfied customers

18+yrs experience. State Inspector and Chevy Diagnostics

< Previous | Next >

Related Chevy Questions
Po300 code: changed plugs, wire and ignition coils. O2
po300 code: changed plugs, wire and ignition coils. O2 sensor also still got po300 code. also whitish blue smoke out tailpipe. 2003 6.0 chevy 2500 … read more
jim
jim
Vocational, Technical or Trade Scho
702 satisfied customers
Service exhaust fluid system 2016 duramac. 79 k seemed
I'm suppose to take a trip tomorrow hauling 3 horses. Don't know if I should try to go… read more
timdieseltech
timdieseltech
diesel tech
Vocational, Technical or Trade School
53 satisfied customers
Exhaust service light is on and pickup will only go 55 miles
exhaust service light is on and pickup will only go 55 miles an hour … read more
GM Tech (Cam)
GM Tech (Cam)
Chevy Technician
30,179 satisfied customers
Swapped the battery in 2008 corvette, now the dual exhaust
swapped the battery in 2008 corvette, now the dual exhaust sounds like it is in competition mode … read more
Marvin the Mechanic
Marvin the Mechanic
87 satisfied customers
Trying to find out exactly what the dual mode exhaust on a
trying to find out exactly what the dual mode exhaust on a 2012 c6 ls3 base 2lt consists of? … read more
Chris (aka - Moose)
Chris (aka - Moose)
Vocational, Technical or Trade Scho
108 satisfied customers
2009 duramax 3000, mi sits a lot, had exhaust filter that
2009 duramax 3000, mi sits a lot, had exhaust filter that would not clean ,replaced with straight pipe and tuned by mechanic.Now engine light code says turbo. I wonder if it was tuned right by mechani… read more
Jerry Newton
Jerry Newton
Vocational, Technical or Trade Scho
2,066 satisfied customers
Fault msg in exhaust Urea treatment: ;P2565-OBD-11. ~78,000;
Fault msg in exhaust Urea treatment: ;P2565-OBD-11 … read more
Todd Audette
Todd Audette
Automotive Technician
Vocational, Technical or Trade School
362 satisfied customers
I have a indicator that is telling me to service my exhaust
I have a indicator that is telling me to service my exhaust fluid system and it's counting down to limit my speed, what can I do to stop this? … read more
Jerry Newton
Jerry Newton
Vocational, Technical or Trade Scho
2,066 satisfied customers
I am just starting to hear a slight exhaust leak on my 97
I am just starting to hear a slight exhaust leak on my 97 k2500 suburban and i am thinking about changing the entire system i want to run dual exhaust with flow masters and headers but still use my o2… read more
Jerry Newton
Jerry Newton
Vocational, Technical or Trade Scho
2,066 satisfied customers
After changing the solenoid for the exhaust and manifold, My
after changing the solenoid for the exhaust and manifold, My '08 Chevy Malibu still has rough acceleration or rough idling … read more
Todd Audette
Todd Audette
Automotive Technician
Vocational, Technical or Trade School
362 satisfied customers
It will not start, ive changed the crank ignition coil and
it will not start, ive changed the crank ignition coil and module but i don't get any spark from the spark plugs … read more
kalamykid
kalamykid
Pactor automotive
Vocational, Technical or Trade Scho
97 satisfied customers
I have a 2015 Chevrolet 2500hd. Service Exhaust Fluid system
Hello I have a 2015 Chevrolet 2500hd. Service Exhaust Fluid system is flashing, 36 miles until speed rated 65mph. I recently had a code for def heater. I replaced heater, temp switch, & def pump. I no… read more
GM Tech (Cam)
GM Tech (Cam)
Chevy Technician
30,179 satisfied customers
Warning light says clean exhaust filter code thrown P0101 on
Warning light says clean exhaust filter code thrown P0101 on Duramax 2008 2500HD … read more
fordguy4u
fordguy4u
Automotive Tech
Vocational, Technical or Trade Scho
70 satisfied customers
I'm getting a service exhaust fluid message. 130,000,
yes, ive tried the module on top of the exhaust fluid tank … read more
Chris (aka - Moose)
Chris (aka - Moose)
Vocational, Technical or Trade Scho
108 satisfied customers
Same issue, as on this screen. 2011 duramax, service exhaust
same issue, as on this screen. 2011 duramax, service exhaust system - see owners manual. Have snap on code reader, no error codes present. 162k miles.… read more
Eric
Eric
Retired
N/A
14,436 satisfied customers
I get a bad odor like rich exhaust from the car. No exhaust
I get a bad odor like rich exhaust from the car. No exhaust leaks, no check engine light all engine data seems normal … read more
rpmdiag
rpmdiag
High school
7,584 satisfied customers
We have changed the ignition coil and the fuel control
we have changed the ignition coil and the fuel control module and still have no fire. … read more
roy
roy
Associate Degree
3 satisfied customers
Changed 1500 ignition coil connector and fuel pump was
changed 1500 ignition coil connector and fuel pump was perfect now dies after 20 sec seems like another wire somewhere is not giving juice to pump … read more
Gary
Gary
Chevy Technician
Vocational, Technical or Trade Scho
9,357 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