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ABS Code C0265


Rick Norwood
01-09-2006, 08:04 PM
I did a searrch on this and couldn't find anything.

On my 2001 S-10 Blazer LT 4WD 4.3 V6, the ABS light stayed on constantly. I finally took it in and the dealership found nothing wrong, They claim the ABS was "Unplugged". Anyway, the light went out and it stayed out for 2 days. (They charged me $50 for diagnostics and to reconnect the unit).

Yesterday, Sunday, it came back on only this time, the red brake light came on too. This morning, Monday, when it was started to take it back to the dealership, both lights went out and stayed out.

I took it in anyway to see if any codes had stored, and this time, the dealership found a C0265 code. They also quoted me a price of $950. parts and labor. The part is a new EBCM and cost about $880, the rest was labor to install and program. Anyone had experience with this code?

blazee
01-09-2006, 08:10 PM
I did a quick search about that code and found this, it may be helpful, I'd definitely look into it before paying that much for a replacement:

ABS Lamp/Stored DTC's ... ABS lamp illumination, accompanied with stored DTC's C0265, C0201 have affected GM trucks and SUV's from model years 1999-2004. DTC U1041 may also be stored in other modules, due to a loss of communication with the brake control module. The illuminated ABS lamp and stored codes result from a bad EBCM (electronic brake control module) ground. The ground point is different for each application, making it necessary to refer to a wiring diagram or circuit locator. Example: Midsize Utilities=Ground 304, SSR=Ground 400, Full-size Trucks and Utilities=Ground 110. GM has encountered a high return rate of EBCM modules due to bad grounds.


Here's another source with basically the same thing:

ABS light on, DTCs set. Some 1999-2004 midsize and full-size GM pickups and SUVs (full list below) may illuminate the ABS light and store DTC C0201 or C0265 in the ABS computer. In addition, code U1041 may set in other modules or you may encounter lost communication between your scanner and the ABS module.

According to GM, all of these problems are probably due to a bad connection at ABS ground GlK), which you'll find on the frame rail just underneath the driver's-side door. Restoring the integrity of the ground should eliminate all the problems. Here's how to go about it:

Start by getting the truck up in the air. Next, locate ground GIlO at the frame rail. Note that several ground wires may be there, but GIlO is the one with the heaviest wire (12-gauge). Disconnect the ground from the rail and use a "whiz wheel" to clean the area in front of and behind the ground connection. Now get a bolt, two star washers and a nut. Install the bolt, ground connection eyelet and star washer on one side of the rail and the other star washer and nut on the other side. Torque the nut to 79 in.-lbs. To complete the fix, spray the bare frame rail with rubberized undercoating (Part No. 12378398 or equivalent), lower the truck, then conduct a road test to ensure that the ABS light stays out.

Rick Norwood
01-15-2006, 12:44 AM
Thanks Blazee, but it is sad news. My Daughter's BF cleaned and tightened the G110 Ground, but the ABS light still comes on. I'll keep you posted on what happens next. Thanks also to Ricksza who pointed me in the right direction of the G110 Ground location. The G110 Ground is were the ABS Electronic Brake Control Module is grounded to the frame.

The location for those of you that are interested is behind the Driver's Head light on the S-10 models and under the driver's door on the frame rail on full size Trucks.

If your ABS light comes on and stays on, Try cleaning and tightening this ground as Blazee describes above BEFORE spending a penny. It just might save you a ton of money.

Rick Norwood
02-02-2006, 12:15 AM
Well I thought I'd close out this thread. We ended up having to replace the EBCM. We bought it from GMPARTSDIRECT.COM for half of what the dealer wanted. All seems to be well now. No more ABS light.:grinyes:

Quarterbore
09-24-2007, 04:52 PM
I am here with the same problem with our 2001 Blazer.

Can I get a description on where this ground can be found?

I am trying to look without a lift but I didn't see any wires on either frame rail under either of the doors. I am going to go back and look more now that I have confirmed it is supposed to be on the drivers side but I wanted to see if anybody has more info...

Thanks & if I find it I will post pics...

Rick Norwood
09-24-2007, 08:21 PM
I am here with the same problem with our 2001 Blazer.

Can I get a description on where this ground can be found?

I am trying to look without a lift but I didn't see any wires on either frame rail under either of the doors. I am going to go back and look more now that I have confirmed it is supposed to be on the drivers side but I wanted to see if anybody has more info...

Thanks & if I find it I will post pics...

On my 2001 4x4 S-10, the ground wire connection was located behind the drivers side head light on or near the Radiator Bracket. You may have to remove the Air Filter Box and/or the head light to get to it.

Good Luck.

ZL1power69
09-25-2007, 04:55 PM
Quarterbore, this thread is almost 2 years old. please refrain from bringing back old threads :nono: .

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