05 Tahoe EBCM

[JPVortex]

Hello, so for a really long time my 05 tahoe has had abs codes. It has a ton of them, and I'm wondering now if the EBCM has failed causing all of these codes? I cleaned up the EBCM ground to no avail.

All the codes seem to have to do with loosing signal with a circuit, which makes me think the EBCM is internally shorting or something.

I also highly doubt that the 2 front wheel speed sensors would both fail at once.

The codes are as follows:

C0291 - Lost Communications With EBCM
C0226 - LF wheel speed sensor signal missing
C0222 - RF wheel speed signal missing
C0268 - Pump motor circuit shorted
C0265 - Solenoid control monitor error

 

[Scottydoggs]

usually with abs codes, clear them, then focus on the one that comes back first. one can trigger others. if its a hard code return, like you start it up and the abs light is on after clearing history, that codes is normally the issue.

 

[JPVortex]

usually with abs codes, clear them, then focus on the one that comes back first. one can trigger others. if its a hard code return, like you start it up and the abs light is on after clearing history, that codes is normally the issue.

I cleared them and they all came right back! Lol. The light is off till I start driving, and after about 25 feet it comes on.

 

[Scottydoggs]

in that case, on yt there are loads of vids where ppl remove the ebcm, open it up and fix a bad solder joint or two. or you can send it to module masters to be rebuilt for a lot less then new, they are bank breakers for sure.

 

[JPVortex]

in that case, on yt there are loads of vids where ppl remove the ebcm, open it up and fix a bad solder joint or two. or you can send it to module masters to be rebuilt for a lot less then new, they are bank breakers for sure.

Not sure if my soldering iron would hold up with this, it's a $10 one from walmart lmao. I may consider a used EBCM, seen a few for around $70 on ebay, probably even cheaper at a junkyard, but theres the chance of it having issues too.

Would I be able to see the bad solder joints?

 

[Rocket Man]

There’s companies that sell reman ones, and you send the core in for a credit.

 

[JPVortex]

There’s companies that sell reman ones, and you send the core in for a credit.

Ok good to know thanks. I'll see if the EBCM will separate from the pump lol.

I may also get a better OBD2 reader that can do an "autobleed" that will run the pump motor and tell me if the pump motor is bad or not.

 

[Rocket Man]

Ok good to know thanks. I'll see if the EBCM will separate from the pump lol.

I may also get a better OBD2 reader that can do an "autobleed" that will run the pump motor and tell me if the pump motor is bad or not.

I checked, looks like only one of the three different ones used are repairable. Maybe you have the repairable one? I see the codes fixed are what you’re getting.

Product Result

Module rebuilds for darn near everything: ABS Modules, Climate Control Modules, Instrument Clusters, Power Accessories, Powertrain modules and more.

modulemaster.com

 

[JPVortex]

I checked, looks like only one of the three different ones used are repairable. Maybe you have the repairable one? I see the codes fixed are what you’re getting.

Product Result

Module rebuilds for darn near everything: ABS Modules, Climate Control Modules, Instrument Clusters, Power Accessories, Powertrain modules and more.

modulemaster.com

How would I know which one I have?

 

[Rocket Man]

How would I know which one I have?

If you look at the pictures on that website, there’s 2 distinct shapes. The one that’s more of a “T” shape (KH 310) isn’t rebuildable; the ones that are an “L” shape (KH 325 and 30 series) are as long as the 30 series , if you have that one, plugs directly into your pump motor. You could chat with them to be sure. Remember, you can drive without the ABS module if you decide to send it to them. Yours isn’t working anyway.

 

[Joseph Garcia]

You will need a bi-directional scanner/programmer tool to program any replacement ECBM to your truck's VIN.

 

[JPVortex]

If you look at the pictures on that website, there’s 2 distinct shapes. The one that’s more of a “T” shape (KH 310) isn’t rebuildable; the ones that are an “L” shape (KH 325 and 30 series) are as long as the 30 series , if you have that one, plugs directly into your pump motor. You could chat with them to be sure. Remember, you can drive without the ABS module if you decide to send it to them. Yours isn’t working anyway.

Ok thanks! I'll remove mine(hopefully those little torx screws come off easily) and see what's up with it.

 

[JPVortex]

You will need a bi-directional scanner/programmer tool to program any replacement ECBM to your truck's VIN.

Ohhh so that's why its not as easy as just buying a used replacement, that's why people always opt for rebuilding.

 

[Rocket Man]

You will need a bi-directional scanner/programmer tool to program any replacement ECBM to your truck's VIN.

Where did you see this? Alldatadiy FSM doesn’t state this for my 02. It does say to use the scan tool tire size calibration but that’s not tied to the VIN and I’m not sure it’s needed. I haven’t replaced one of these on these trucks but I have on a couple other vehicles and no programming was needed.

Edit: is that the part where it says “return to ABS diagnostics”?

 

[Joseph Garcia]

Where did you see this? Alldatadiy FSM doesn’t state this for my 02. It does say to use the scan tool tire size calibration but that’s not tied to the VIN and I’m not sure it’s needed. I haven’t replaced one of these on these trucks but I have on a couple other vehicles and no programming was needed.

Edit: is that the part where it says “return to ABS diagnostics”?
View attachment 390451

I have not personally done this myself, so I could very well be wrong. I've heard this from others, but hearsay is simply hearsay.

 

[JPVortex]

Would there be any chance of the actual PCM itself being bad? And loosing connection with the EBCM/ABS system? I ask this because I have a spare PCM lying around that a friend gave me amongst other random parts that he had leftover from a partout, and deciding if it's worth trying to swap out PCMs

 

[Rocket Man]

Would there be any chance of the actual PCM itself being bad? And loosing connection with the EBCM/ABS system? I ask this because I have a spare PCM lying around that a friend gave me amongst other random parts that he had leftover from a partout, and deciding if it's worth trying to swap out PCMs

You would definitely need a Tech2 to program a PCM to your VIN as well as do a VATS relearn after that in order to start the truck if you swap out the PCM. I’ve been there, done that. And it’s unlikely that’s the problem.

 

[JPVortex]

You would definitely need a Tech2 to program a PCM to your VIN as well as do a VATS relearn after that in order to start the truck if you swap out the PCM. I’ve been there, done that. And it’s unlikely that’s the problem.

Yeah that's what I thought, was just thinking it'd be worth trying cause it's on hand. Theres also the 30 minute relearn procedure so the truck will be able to start.

 

[JPVortex]

Everytime when the abs light comes on when I start driving I hear a little vibration then it comes on. Sounds like maybe the abs pump running for a split second then the abs light comes on, interesting

 

[JPVortex]

May replace those 2 speed sensors first