Any help would be appreciated. All I really know is what the summary above says. I heard there is a way to pull the code using the cruise controls, but I'm not sure how to do it. It would also be helpful if I could find where to diagnose the code once I have it. Thanks in advance.Peterbilt with a Cat 15 check engine light flashing while driving. Help!?
First of all make sure your coolant level is at (or slightly above) full on level ground. This is a common cause of an active fault indicator.
1. Turn ignition on and let ECM go through pre-check.
2. Turn on cruise control.
3. Push SET/RESUME switch to either position and hold. The yellow diagnostic light will begin to flash - you can release the Set/Resume switch after it begins flashing.
4. Count the flashes. The diagnostic code is a two digit code. There will be one set of flashes for the first digit, a short pause, then another set for the second. If there is more than one active fault code there will be another sequence of flashes, etc.
5. Check PDF (read only) at link below to find the code/diagnosis.
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