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I have a 2016 Chevy Colorado diesel. With 125,000 miles. Today I was driving it about 60 miles an hour when all of a sudden I lost power my stability track and ABS light came on as well as engine light. Now it’s running super rough and I can’t get above 20 miles an hour. The codes it is throwing is P0269. Fuel rail pressures and everything are fine
 

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If I had to guess I'd say check for a wiring rub through somewhere pertaining to the injectors or a critter that has chewed on a wiring harness.
 

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I would pull your #3 Injector. If everything looks good, run a compression test on the cylinder. Let us know how it turns out.
 
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