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The Limp Mode (( Short for Limp on home mode )) will be set in the Computer. if water got into diesel fuel for a 20ft NRR D Isuzu vehicle, could the cost to fix it be over 10,000? … Answers : Repair Help & Product Troubleshooting for Cars & Trucks Tips for a great answer: - Provide details, support with references or personal experience . This page provides practical advice on how to fix limp mode to get you back on the road again. Please enable Cookies and reload the page. Fixing limp mode is important. Although it very well be a wiring issue, or a one time pop. 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