Thread: Bad wiring? Or bad module?

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  1. #1 Bad wiring? Or bad module? 
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    05 Comp G

    Been driving for a couple months with ABS, Traction, and BRAKE warning lights all on. Started as just ABS and Traction intermittently coming on (shutting off when I restarted the car) then when when they were solid and not ever turning off the BRAKE light joined.
    Finally made friends with someone that has a computer to read brake codes and it came up Front Right Wheel speed sensor.
    Replaced the hub on that wheel but the lights are still sticking around.
    Shot some WD-40 onto the harness to try to clean it out and although I don't totally understand a multimeter, I was about to get some sort of reading through the harness while the ignition key was ON.
    Finally realized that there were actually 2 codes that came up on my buddy's scanner:
    C0121 Valve Relay Circuit Malfunction
    C0040 Right Front Wheel Speed Sensor Circuit Malfunction

    Tomorrow I'm gonna rip a harness from the Pick N Pull just to be certain it's not just a bad connection, but that C0121 code has me worried, am I really gonna have to drop ~$400 on a new module?
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  3. #2 Re: Bad wiring? Or bad module? 
    I can't car too good. SaukRapids's Avatar
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    No. I have the same car and Matt Malory at cheapabs.com repaired mine. He's on ebay. I don't remember the name, sry.

    It isn't something I wanted to attempt myself, even tho fb kept saying it was "easy." Instead of risking $400 in damage done with no help at all, which didn't seem like a very good option, I sent it to him for about $125.

    I never could totally remember the code the shop pulled. I believe it was like 0500, but idk.

    Hardest part is taking the thing out. I didn't drive it with the module off, even though it says you can. Matt was actually on vacation when I sent mine in. Turnaround was still within about a week.
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  4. #3 Re: Bad wiring? Or bad module? 
    I can't car too good. SaukRapids's Avatar
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    I just clicked over, and Matt is closed until July.

    Personally, I'd search ebay for the same service with good reviews. You should be able to find someone to repair it.
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  5. #4 Re: Bad wiring? Or bad module? 
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    Thanks!
    In my research I found cheapabs.com, I assume that's the guy you're talking about? There's an auto shop that specializes in electronics in my town, I might swing by and see what they can do. Gonna have to wait till payday tho...

    Just wondering, I looked it up on gmpartsdirect and it says that the module w/traction control AND active brake control (WS6 & JL4) is a discontinued part and googling the part number I couldn't find it available anywhere. But I saw a thread somewhere saying they used a gxp module and it worked. What's the deal there? Is there a difference? They are different part numbers.
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  6. #5 Re: Bad wiring? Or bad module? 
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    Shop in town says no one here rebuilds modules. Anyone suggest a guy? Don't feel like waiting till July.
    I'll take the module off and see if cleaning it some doesn't help.
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  7. #6 Re: Bad wiring? Or bad module? 
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    Replaced the harness... SOB lights are still on. Gonna have to get the module rebuilt.
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  8. #7 Re: Bad wiring? Or bad module? 
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    I would recommend getting new harnesses, they are not expensive. I had my module rebuilt but I also swapped out the old harnesses for new ones. With electrical I usually just replace vs. getting something used. But in the case of the ABS module, yeah wait for him. He fixed mine years ago and its held up ever since.
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