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I apologize on the late reply. This looks to have been in the wrong category and it was moved over just a few minutes ago.
To understand you correctly, you are getting the flash codes, but it only happens when the A/C is on?
CLICK HERE for the flash code list. As you can see, you have a cylinder 1/2 fault as well as a engine retarder solenoid fault on the engine. I suggest having the CAT ET put onto the truck to narrow the code down and to test the injectors/solenoids on the engine.
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