Hi
It is possible for just one line on the PCM to be bad.....however, it is best to see if there is something else causing the failure..... Check out all things first before replacing a PCM... But if one part of the PCM goes bad then it would have to be replaced.. But most of the time a car will run even if the PCM is bad... Just depends on what part of the board went bad.
Please get back to us if you have further query or else please accept the solution.
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