limp mode

  1. M

    Starting in limp mode

    Hello fellow LB7 owners, I have an 03 2500HD with 266K that is starting in limp mode. Batteries and alternator are new and tested. CP3 pump has pressure. Fass pump is working and is a little over a year old. Every morning when I go to start it will start in limp mode. If I shut her off, open...
    • Masterblaster
    • Thread
    • limp mode starting rough
    • Replies: 4
    • Forum: LB7
  2. L

    Insights into Fuel Problem

    Fuel filter on my truck physically failed. I knew it was time for a change so I already had a replacement in hand. Switched it out. Afterwards a P0088 code for high fuel rail pressure appeared. It has been accompanied by the following caveats. After I start the truck, it idles rough. If I...
    • LB74ever
    • Thread
    • fuel filter fuel rail pressure limp mode p0088
    • Replies: 13
    • Forum: LB7
  3. Starfire47

    Limp Mode P0700 P0776

    Looking for input with an issue I have been chasing my tail on. Have a 2003 Chevy Lb7, has a generic canned tune (bully dog?) from the previous owner. 4" Exhaust, New injectors, K&N Intake, 35" tires, 230,000 miles Never had any issues with the truck, have put 70,000 miles on it since I've...
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