Code finally appeared!
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Fleet Mechanic
Joined: Jun 2006
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Code finally appeared!
It's been about 18 months or more that my F550 has been a little down on power. It finally set a code tonight, P061B internal control module calculation performance. This truck did have a programmer on it from Mike, and never quite seemed right (pinged a bit even on 87 tune, had to run premium) so I took it out. Anybody know what could be the cause of this code?
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