: Abs C0235 code on 2002 ext AWD?



rideevo
10-05-12, 06:04 PM
so i bought this 2002 escalade ext a month ago,it has the abs,brake light are on.I scaned for abs dtc and it has a C0235 left rear speed sensor open or short? i thought an the awd the rear abs reads the vss on the transfer case??? vss checks ok and spedometer works? anything else i can check before i take it to the shop?

wesyder
10-05-12, 07:20 PM
so i bought this 2002 escalade ext a month ago,it has the abs,brake light are on.I scaned for abs dtc and it has a C0235 left rear speed sensor open or short? i thought an the awd the rear abs reads the vss on the transfer case??? vss checks ok and spedometer works? anything else i can check before i take it to the shop?

If its coding for left rear there has to be a left rear sensor ill go out in a min and get back to you

the cadillac man
10-05-12, 07:36 PM
Here is a link for you
http://www.justanswer.com/uploads/mcvgreg/2008-04-20_191120_1998-Savana-C0235-Debug.pdf

wesyder
10-05-12, 09:09 PM
so i bought this 2002 escalade ext a month ago,it has the abs,brake light are on.I scaned for abs dtc and it has a C0235 left rear speed sensor open or short? i thought an the awd the rear abs reads the vss on the transfer case??? vss checks ok and spedometer works? anything else i can check before i take it to the shop?

Ok there are 2 rear sensors jus behind backing plate near parking brake cable on each side, i viewed them from the rear of the vehicle

rideevo
10-05-12, 09:36 PM
well it is dark outside, i did look and didnt see any wires to either rear backing plate?just brake line and ebrake cable. i will look again tommrow in the light

wesyder
10-05-12, 10:38 PM
well it is dark outside, i did look and didnt see any wires to either rear backing plate?just brake line and ebrake cable. i will look again tommrow in the light

Ok, they attach to the end of each side of the rear axle near the backing plate, i haven't figured out how to resize images from my iPhone or i would post pics

the cadillac man
10-06-12, 05:14 AM
Ok, they attach to the end of each side of the rear axle near the backing plate, i haven't figured out how to resize images from my iPhone or i would post pics

Man I know how you feel I would try using tapatalk some say it works (don't hold me to this) I have a iPhone which the bad part is the camera takes the pics is a size that's way to big for the site(I had to use the front camera on my iPhone 4 just to get the ones I have on my rear air servicing how to(that is how I did it)

Also I never thought there was four sensors in the rear that's sounds expensive.

wesyder
10-06-12, 12:03 PM
Man I know how you feel I would try using tapatalk some say it works (don't hold me to this) I have a iPhone which the bad part is the camera takes the pics is a size that's way to big for the site(I had to use the front camera on my iPhone 4 just to get the ones I have on my rear air servicing how to(that is how I did it)

Also I never thought there was four sensors in the rear that's sounds expensive.

There are jus two sensors one left and one right i worded it kinda weird

rideevo
10-06-12, 01:14 PM
98346
so here is a photo of left rear axel/brake area i dont se a place for a abs sensor?

wesyder
10-06-12, 02:01 PM
<img src="http://www.cadillacforums.com/forums/attachment.php?attachmentid=98346"/>
so here is a photo of left rear axel/brake area i dont se a place for a abs sensor?

U know what i jus looked at your year, my 2005 has sensors that would be shown in the same pic you posted

the cadillac man
10-06-12, 02:45 PM
<img src="http://www.cadillacforums.com/forums/attachment.php?attachmentid=98346"/>
so here is a photo of left rear axel/brake area i dont se a place for a abs sensor?

My 03 looks the same way odd??

rideevo
10-16-12, 03:46 PM
well i took it into the dealer the said they are not sure what is seting codes? i had other electrical things going on
so i asked them to re install software in the bcm.they said the abs code C0235 and C0236 are locking them out of bcm update/reprogram? any one heard of this?

the cadillac man
10-16-12, 06:06 PM
well i took it into the dealer the said they are not sure what is seting codes? i had other electrical things going on
so i asked them to re install software in the bcm.they said the abs code C0235 and C0236 are locking them out of bcm update/reprogram? any one heard of this?

I think you need new wheel speed sensors(wheel hubs) if your wiring Isn't damaged.
C0235 means rear speed signal circuit open
C0236 means rear speed signal circuit missing

rideevo
10-16-12, 08:12 PM
the 2002 doesn't have rear wheel sensors it reads off the transfer case...... see my photo of rear axel...

the cadillac man
10-16-12, 09:03 PM
the 2002 doesn't have rear wheel sensors it reads off the transfer case...... see my photo of rear axel...

Well it may mean the sensor on the transfer case since there is no sensors on the rear wheels.

rideevo
10-16-12, 10:34 PM
the dealer confirmed the vss on transfer case is active and working, speedometer is also working, pcm is seeing signal, they wanted to start replacing ebcm,ecm even though they passed when tested? about $1400 but they wont guarantee it will work

the cadillac man
10-17-12, 09:31 AM
the dealer confirmed the vss on transfer case is active and working, speedometer is also working, pcm is seeing signal, they wanted to start replacing ebcm,ecm even though they passed when tested? about $1400 but they wont guarantee it will work

It may be the ebcm since the bcm works everything in the truck(except the engine and tranny)

rideevo
10-17-12, 01:27 PM
the dealer checked ebcm said it checked good.....but they still wanted to replace it?bcm makes more sense to me but dealer said abs codes are locking the tech2 out of bcm? maybe bcm is correct

the cadillac man
10-17-12, 03:25 PM
the dealer checked ebcm said it checked good.....but they still wanted to replace it?bcm makes more sense to me but dealer said abs codes are locking the tech2 out of bcm? maybe bcm is correct

Try pulling the abs fuse and see if they can access the bcm if no then the bcm may have developed a internal short
If they can access it then the ebcm is bringing down the network in the truck(I know as my PCM did this when it failed due to internal short)

rideevo
10-17-12, 04:19 PM
I will ask to se if they tried that,great idea!!

the cadillac man
10-17-12, 05:55 PM
I will ask to se if they tried that,great idea!!

If the fuse trick don't work then have them disconnect The EBCM module and try it

amtrucker22
11-04-12, 10:51 PM
Any updates?

rideevo
11-05-12, 11:28 PM
have not had it back at dealer.still recovering from the last bill.and still fixing other stuff.
hopefuly in the next month i will get it back to the dealer

the cadillac man
11-06-12, 12:23 AM
have not had it back at dealer.still recovering from the last bill.and still fixing other stuff.
hopefuly in the next month i will get it back to the dealer

I know how it feels I recently had both belts and tensioners replaced on my truck(and glad I did as both belts were close to snapping)