Medium and Heavy Trucks
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Code 25 indicates a boost pressure circuit fault. I've seen this many times. This code is often caused by a faulty boost pressure sensor. I would consider replacing it first. It's possible for the code to be caused by the wiring harness or ECM but that's rare. Normally when one of these are the problem. The code is active all the time.
I would suspect replacing the boost pressure sensor will cure your problem.
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No that's not normal if the load and speed is steady. The boost may move 1 psi but should not be moving 5 psi.
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