POSSIBLE CAUSES:
1. Low vehicle speed with high engine load (steep grade climb).
2. Fan operation.
3. Winter front in high ambient temperatures.
NOTE: If any battery voltage codes present, first those first. If code 625-9 active, fix that before proceeding as well.
PROBABLE CAUSES:
1. CPC recently programmed incorrectly.
2. Another computer on the truck is the cause of the problems (ABS, transmission, etc…)
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