04 ext Shuts off randomly.
Cadillac
 

Cadillac Forums | Help Us Help You | Advertise | Cadillac Parts | Cadillac News | Cadillac Classifieds / (Old System)

Cadillac Technical Archive | Cadillac Dealers | Cadillac Reviews | Cadillac Dealer Reviews | Cadillac Vendors

CadillacForums.com is the premier Cadillac Forum on the internet. Registered Users do not see the above ads.
+ Reply to Thread
Page 1 of 3 1 2 3 LastLast
Results 1 to 15 of 39
Cadillac Escalade, EXT and ESV Forum - 1999 - 2006 Discussion, 04 ext Shuts off randomly. in Cadillac Escalade Forums; About 2 weeks ago while driving my ext the traction control light came on saying service stability system and the ...
  1. #1
    Bigrick31 is offline Cadillac Owners Member
    Automobile(s): 04 Escalade EXT
    Join Date
    Apr 2009
    Age
    28
    Posts
    21

    Question 04 ext Shuts off randomly.

    About 2 weeks ago while driving my ext the traction control light came on saying service stability system and the the truck would go into reduced power mode. I did a lot of research on the subject and it seemed that the most likely cause was either a bad throttle position sensor or a bad pedal position sensor. Before replacing either sensor I carefully inspected the wiring coming off of the Tps. Everything looked good and I ended up replacing both the APS and the entire throttle body. During the process my battery had died I had tested the battery before I changed the other parts and I was reading 12v with the truck off and 14v with the truck running with High beams on and AC on full blast. After the battery dropped below 9v (an optima yellow top) I attempted to recharge the battery but the voltage refused to increase.

    I purchased a new battery and the truck drove fine for a couple of days. Then one day while driving every time I would hit a bump in the road my doors would unlock and then lock again plus the gas pedal wouldn't respond for maybe 5 seconds and then everything would work again. Finally I hit a bump and the truck shut off completely. The navigation and dash lights all worked but the engine was off and pulling over to the shoulder the truck wouldn't start any more the engine wouldn't even crank nothing happened at all when I i turned the key but the electronics would come on.

    I got the truck towed home and noticed that one of the bulbs in each headlight were on and would nit turn off. I think it's a blinker bulb the top left bulb if your looking at the driver side headlight head on and the same one on the passenger side but that one is top right. So I disconnected the battery.

    I havnt been able to pull any codes from the truck because every time I try my scanner says unable to communicate with vehicle. I was previously able to to get my scanner to communicate with the vehicle which is when I changed the TPS sensor but after the truck continued to go into reduced power mode I tried using my scanner again but it wouldnt work that is when I changed the TB and Battery. I made sure to check my cigarette lighter fuse as its the same fuse used to power the obd2 system and it was good. While talking with a friend he suggested I may have a bad ECM I checked online and found I could get a working used ECM flashed to my vin for $100 I'm going to give that a shot when u get home.

    I was wondering if anyone had any ideas what the problem may be just in case it isn't my Ecm. I've also tested all of the relays in the fuse box under the hood and even tested my ground wires at the frame and engine block which all test as good.

  2. Remove Advertisements
    CadillacForums.com
    Advertisements
     

  3. #2
    Bigrick31 is offline Cadillac Owners Member
    Automobile(s): 04 Escalade EXT
    Join Date
    Apr 2009
    Age
    28
    Posts
    21

    Re: 04 ext Shuts off randomly.

    UPDATE... Replaced ECM and nothing changed. My scanner is still unable to communicate with the vehicle I hear nothing when I turn the key to start the truck. The security light (picture of a car with a lock on the dash) is stuck on and the I still have the one bulb in each headlight on non of which will turn off unless I disconnect the battery.

  4. #3
    the cadillac man's Avatar
    the cadillac man is offline Cadillac Owners Master
    Automobile(s): 03 cadillac escalade
    Join Date
    Mar 2011
    Location
    speedwell tn,
    Posts
    7,529
    Quote Originally Posted by Bigrick31
    UPDATE... Replaced ECM and nothing changed. My scanner is still unable to communicate with the vehicle I hear nothing when I turn the key to start the truck. The security light (picture of a car with a lock on the dash) is stuck on and the I still have the one bulb in each headlight on non of which will turn off unless I disconnect the battery.
    I wonder if it is the bcm going bad(it works the lights and security system)

  5. #4
    Bigrick31 is offline Cadillac Owners Member
    Automobile(s): 04 Escalade EXT
    Join Date
    Apr 2009
    Age
    28
    Posts
    21

    Re: 04 ext Shuts off randomly.

    is there any way to test the BCM before going to the dealer for a new one? Do you think theres any chance its the ignition switch or the passlock system?

  6. #5
    the cadillac man's Avatar
    the cadillac man is offline Cadillac Owners Master
    Automobile(s): 03 cadillac escalade
    Join Date
    Mar 2011
    Location
    speedwell tn,
    Posts
    7,529
    Quote Originally Posted by Bigrick31
    is there any way to test the BCM before going to the dealer for a new one? Do you think theres any chance its the ignition switch or the passlock system?
    Well is anything else in the truck acting up (the bcm works everything in the truck
    Lights(interior and exterior)
    Locks
    Both front door modules(door switches)
    Wipers(front and rear)
    Radio and amp(including the cd changer 03+)
    Gauges
    Seats(both memory and seat controls via seat module)
    Locks
    Keyless entry
    Onstar system
    Rear seat entertainment system
    Pass lock system/anti theft system
    And recives data and sends data from and to the PCM via the class-2 data bus

    If multiple things in the list is acting up then most likely the bcm is the cuplrit

  7. #6
    Bigrick31 is offline Cadillac Owners Member
    Automobile(s): 04 Escalade EXT
    Join Date
    Apr 2009
    Age
    28
    Posts
    21

    Re: 04 ext Shuts off randomly.

    Everything works as it should in the vehicle the only time then door locks or headlights give me trouble is randomly when I hit a bump in the road which will cause the truck to either shut off completely or go through a 5 second reset. Ocasionally when I hit a bump I will get the traction control disabled message but the truck no longer goes into reduced power mode. That is when the truck actually runs. Oh and the keyless entry dosnt work when the truck won't start. When the truck starts and runs normally the keyless entry works.

  8. #7
    the cadillac man's Avatar
    the cadillac man is offline Cadillac Owners Master
    Automobile(s): 03 cadillac escalade
    Join Date
    Mar 2011
    Location
    speedwell tn,
    Posts
    7,529
    Quote Originally Posted by Bigrick31
    Everything works as it should in the vehicle the only time then door locks or headlights give me trouble is randomly when I hit a bump in the road which will cause the truck to either shut off completely or go through a 5 second reset. Ocasionally when I hit a bump I will get the traction control disabled message but the truck no longer goes into reduced power mode. That is when the truck actually runs. Oh and the keyless entry dosnt work when the truck won't start. When the truck starts and runs normally the keyless entry works.
    I would be checking ground connections as it sounds like one is loose
    It may be tied into the traction control message not sure but most likely its because of low voltage(loose connections can cause this)

    First clean both battery cables and terminals to see its a bad connection at the battery(do this first)

  9. #8
    Bigrick31 is offline Cadillac Owners Member
    Automobile(s): 04 Escalade EXT
    Join Date
    Apr 2009
    Age
    28
    Posts
    21

    Re: 04 ext Shuts off randomly.

    Ok I cleaned the battery terminals really well and I still get nothing. I checked continuity between the battery negative and the ground wires that go to my frame and engine block both test good. I did notice when I tried to start the truck after cleaning the battery terminals that I cold hear what sounds like the fuel pump making a pfft sound after every failed start. Just to clarify the truck will not crank but all electronics work just fine. Again after attempting to start the truck I had to disconnect the battery because there was a bulb in each headlight that remained on.

    Edit- Dont know if this matters but my fuel gauge reads empty however when the truck last ran I had close to a full tank of gas.

  10. #9
    the cadillac man's Avatar
    the cadillac man is offline Cadillac Owners Master
    Automobile(s): 03 cadillac escalade
    Join Date
    Mar 2011
    Location
    speedwell tn,
    Posts
    7,529
    Quote Originally Posted by Bigrick31
    Ok I cleaned the battery terminals really well and I still get nothing. I checked continuity between the battery negative and the ground wires that go to my frame and engine block both test good. I did notice when I tried to start the truck after cleaning the battery terminals that I cold hear what sounds like the fuel pump making a pfft sound after every failed start. Just to clarify the truck will not crank but all electronics work just fine. Again after attempting to start the truck I had to disconnect the battery because there was a bulb in each headlight that remained on.

    Edit- Dont know if this matters but my fuel gauge reads empty however when the truck last ran I had close to a full tank of gas.
    Sounds like a module

  11. #10
    Bigrick31 is offline Cadillac Owners Member
    Automobile(s): 04 Escalade EXT
    Join Date
    Apr 2009
    Age
    28
    Posts
    21

    Re: 04 ext Shuts off randomly.

    I can find used BCMs on ebay for about $30 then I guess I just need to tow the truck to the dealer to have it programmed or can i just bring the module to the dealer and then install after programming or is a used BCM a bad idea?

  12. #11
    the cadillac man's Avatar
    the cadillac man is offline Cadillac Owners Master
    Automobile(s): 03 cadillac escalade
    Join Date
    Mar 2011
    Location
    speedwell tn,
    Posts
    7,529
    Quote Originally Posted by Bigrick31
    I can find used BCMs on ebay for about $30 then I guess I just need to tow the truck to the dealer to have it programmed or can i just bring the module to the dealer and then install after programming or is a used BCM a bad idea?
    I don't know I haven't had to it so far but I recommend the programming be left to the dealer(I went through this kind of issue with my PCM except it kept my truck from starting)

  13. #12
    Bigrick31 is offline Cadillac Owners Member
    Automobile(s): 04 Escalade EXT
    Join Date
    Apr 2009
    Age
    28
    Posts
    21

    Re: 04 ext Shuts off randomly.

    Ok bought the BCM will report back when it arrives.

  14. #13
    the cadillac man's Avatar
    the cadillac man is offline Cadillac Owners Master
    Automobile(s): 03 cadillac escalade
    Join Date
    Mar 2011
    Location
    speedwell tn,
    Posts
    7,529
    Quote Originally Posted by Bigrick31
    Ok bought the BCM will report back when it arrives.
    I feel your pain I had a car that had bcm issues and it would do all kinda of crazy crap(one time I couldn't get the engine to start it would crank but not run)

  15. #14
    Bigrick31 is offline Cadillac Owners Member
    Automobile(s): 04 Escalade EXT
    Join Date
    Apr 2009
    Age
    28
    Posts
    21

    Re: 04 ext Shuts off randomly.

    Got the new BCM in just now called the Cadillac dealer near me and they said I had to have the new BCM installed in the vehicle for them to reprogram it. Im going to install the new BCM and have my truck towed over to the dealer. If this dosnt work they are going to run a diagnostic for me to see whats wrong.

  16. #15
    Bigrick31 is offline Cadillac Owners Member
    Automobile(s): 04 Escalade EXT
    Join Date
    Apr 2009
    Age
    28
    Posts
    21

    Re: 04 ext Shuts off randomly.

    So its $150 for the dealer to reprogram the BCM it would have been $300 but I Already installed the BCM prior to having the vehicle towed to the dealer. They will call me tomorrow to let me know if that worked. If not its $450 for an extensive diagnostic.

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.
If you do not want to register, fill this field only and the name will be used as user name for your post.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Bookmarks

Cadillac Posting Rules

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
Read about Lincoln | Buick | Kia Forte Forum
Need products for your Cadillac? Check out your options at the links below:

custom floor mats | Cadillac Chrome and Black Chrome Wheels | window tinting