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What's this code?

Discussion in 'Chevy Trucks' started by Farm Boss, Oct 15, 2008.

  1. Farm Boss

    Farm Boss Senior Member
    Messages: 183

    Hello. I was wondering if anyone knows off hand what a C0040 code is. I have a 2005 chev with the 8.1. I was just screwing around with a buddies performance chip on my truck last night and this code was picked up. Never has triped my check engine light so just wondering if you guys had any leads. Thanks!!!
  2. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    It didn't trip the CE light because it's not a powertrain code, it's an ABS/brake system code (C).

    And it's for an erroneous reading that the EBCM is seeing from the right front wheel speed sensor.
  3. TLB

    TLB Senior Member
    Messages: 274

    C0040 is the right front wheel speed sensor, what were you doing?
  4. Farm Boss

    Farm Boss Senior Member
    Messages: 183

    when I hooked up this computer chip programer, it said to go further it required clearing this code, told me the code, and I moved on. I just tried it for a nite and gave the programer back to my buddy.