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ABS/TCS module

This is a discussion on ABS/TCS module within the General Help forums, part of the LSx Technical Help Section category; Hello, After getting my 1998 Firebird TA washed, my TCS light came on and stayed on. Dealer pulled code 239 ...

  1. #1
    Junior Member
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    red
    1998 trans am

    ABS/TCS module

    Hello,

    After getting my 1998 Firebird TA washed, my TCS light came on and stayed on. Dealer pulled code 239 and following the manual troubleshooting tree, found a short to ground in the ABS/TCS module (the one with the long acronym name that I can't remember) and says it'll cost $1150 to replace the module.

    Any idea where I can find one cheaper than that? Think gmpartsdirect will have one?

    Thanks in advance.

  2. #2
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    00 LS1, WS6, V8 Gremlin
    96 & 98 GTPs, 64 'Cuda

    Don't be so quick to replace it, sounds like the same deal as in the last post I replied to. The wheel speed sensor connectors are notorious for failing after getting wet and could easily cause a false report of a bad ABS module.

    Unplug them all, clean all the electrical contacts with contact cleaner then coat with a bit of silicone grease.

  3. #3
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    red
    1998 trans am

    follow-up:

    The dealer ran their troubleshooting tree and the TCS module has a short to ground in it. Unfortunately gmpartsdirect.com says that the module is on backorder from GM and there is no delivery date, so I might not be able to get a new module from anyone.

    Bummer.
    '98 Trans-Am
    Running SCCA Solo2 in FS, so minimum mods
    !CAGS, muffler, K&N air filter, Koni single adjustable shocks

  4. #4
    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    SILVER
    2004 CTS-V

    Hmmm! I have the same issue. I will try that. I also am wondering if the speed sensors for a 97 are the same for a 98. I was gonna try and so a swap to isolate the problem.

    What kind of voltage will the speed sensor send?

  5. #5
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    red
    1998 trans am

    I dunno what voltage it sends. The service manual troubleshooting guide says to check for a circuit between a certain pin and ground. If there is a circuit there, then the module is shorted out internally and must be replaced. That's what they found with mine.

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