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  1. 6.5L Diesel Engine
    Ok guys, finally got my truck ( 1998 K2500 HD ) running and actually drove it today for the first time in 3 months. It has a P0251 code and a P0126 ( low coolant ). The mechanic said it needed a new injection pump even though the one in it is brand new. I found a major ground wire not hooked up...
  2. 6.5L Diesel Engine
    New(ish) to working on diesels. I have a 2003 GM Workhorse (USPS delivery truck) that is surging and very occasionally stalling. It’s got 136,500 miles on it. I have a cheapy OBD scanner that gives me a P0126 code “injector/injection timing control circuit”. Is this injector pump for sure or...
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