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  1. J

    Yes another Limp mode post! 03

    I called the local dealer, they said they couldn't do it. I towed it to a shop about 25 miles away because they said it was no problem on the phone, but there computer (a bluepoint) wouldn't show any codes. I had the codes ran before and it showed speed sensor and NSBU switch, but it also...
  2. J

    Yes another Limp mode post! 03

    Bought a 03 cab and chassis Topkick. Ex ambulance 4 door c4500. Slight damage to pass side doors and quarter fender, put it out of service. I want to install a rollback bed. Truck runs great, but stuck in 3rd. (Limp Mode). Replaced NSBU, replaced wire pigtails for NSBU and replaced all three...
  3. J

    New to Forum

    I am here like many looking for answers to a problem. Another limp mode issue. I have always been a fan of the duramax and finally was able to buy one, but it's no fun driving round in 3rd. gear. I appreciate any advise I will receive in advance and hope everyone has a wonderful new year.. John
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