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2004 Z06
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42 Posts
Discussion Starter · #1 · (Edited)
First time Corvette owner. Already finding issues with it.
Looks like I am having the infamous ABS/Traction Control/Service Engine Soon issues.

DIC Codes:
PCM: P0856
TCS: No Comm
SDM: U1040.
Gotta love it.

Will be making sure the battery is properly charged, will clean, I believe, 9 grounding points, and then go from there!

I hope I don't have to do the EBCM solder 'fix'.
 

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2004 Z06
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42 Posts
Discussion Starter · #2 ·
Completed so far:

Battery:
Battery was replaced last fall.
Connections were clean upon inspection.
Removed and cleaned battery connections.
Have battery tender connected and will let it stay overnight

Grounds:
Removed and cleaned two grounds.
One on the passenger's side directly across from the EBCM​
One on the drivers' side directly across from the EBCM​
 

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DC PIT CREW BOSS
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43,432 Posts
Welcome to DC Good luck with your troubleshooting. You might want to check out these threads

The first about someone else that had your problem
CLICK HERE
.
And this one with a lot of info you might be interested in as a new C5 owner
CLICK HERE


Let us know how you are progressing
 
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Discussion Starter · #4 ·
Thank you very much for the reply!

I am familiar with the information in the second link, but glad I read it.

I read the first link and will keep this post updated as I go. Hopefully something will jump out like what was found in the link and I can get this repaired. The Vette only has 26,000 on it.
 

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2004 Z06
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Discussion Starter · #6 ·
Mine is not intermittent and hopefully I will get some time tomorrow to clean the black boxes that are attached to the two grounds I cleaned earlier.
 

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Discussion Starter · #10 ·
Removed and cleaned all the grounds. Also cleaned the ‘black boxes’ interiors connected to the grounds. I used electrical parts cleaner and lubricated all connections to prevent corrosion.

Still have the ABS issue.
 

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Not to be mean. Personally this is where I’ve done everything I know to do and I realize I don’t know what I don’t know. It’s time to take to someone who does.
 

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Discussion Starter · #12 ·
Triple dizzle: No offense taken at all.

I’ll generally try many things to eliminate the ‘easy’ stuff and many times that fixes the issue.

It appears that things are pointing to the EBCM after reading up on the issue on the web so I can either:

1. Take it to the dealer to diagnose the issue.
2. Remove the EBCM and send it for repair.
 

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Yea me to try everything I can to dyi it but also have to know limits. Can be frustrating at times thinking maybe this will fix it only to be disappointed. Good luck hope it’s not the control unit. Keep posting interested on how it goes.
 

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2004 Z06
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Discussion Starter · #14 ·
I removed the EBCM wire harnesses and inspected / cleaned them with electronics cleaner.

All pins / connectors appear in good shape.

I put the connectors back on and still have the ABS dash lights.

Next, I will remove the EBCM and solder the 5 areas that others have re-soldered and have successfully repaired.
 

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Discussion Starter · #15 ·
Removed the EBCM today. Closely inspected its pins... all are clean and straight.

I didn't have time to open it up, clean the board, and solder. No rush. Will work on it tomorrow as time permits.

Oh, and for those who may view this thread... go ahead and disconnect the radiator hose from the engine and air intake. Just makes it easier to get to the bolts that hold the ECBM unit.

Maybe I will post some pics, but also know there are a lot of YouTube videos that cover this.
 

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DC PIT CREW BOSS
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You were wise not to start it when you felt rushed. Good tip about the radiator hose. Please do post some pics
 
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Discussion Starter · #18 · (Edited)
UPDATE: After careful consideration and in-depth reviews of DIY repairs videos, I decided to have the EBCM rebuilt.

I thought this to be the wisest decision for a few reasons:

1. I didn't want to hit and miss the actual repair.
2. DIY repair may damage the part beyond repair.
3. Professional rebuild cost is minimal.
4. Confidence in vendor rebuilding EBCM.
5. 5 year warranty given on my rebuilt EBCM.

I sent the module to Module Master - Module Rebuilds done right..
 

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Discussion Starter · #20 ·
Received and installed the ABS Module.

Side note: The original module was not able to be rebuilt but Module Masters had a rebuilt one in stock.

Installed the 'new' module, started the car, and the lights were still on.

Took a deep breath, turned the car off, restarted, no lights!

Went on a 300 mile trip through heat and severe downpour... no issues!
 
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