Conditions for Setting the DTC: P0638
WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
- The ECM detects that the commanded duty cycle for the range test high is greater than 80 percent.
OR
- The ECM detects that the commanded duty cycle for the range test low is greater than 80 percent.
- Either condition exists for greater than 1 second.