FixVault
Home
›
Cadillac
›
2005
›
XLR
›
Repair and Diagnosis
›
Engine Performance
›
System
›
Engine Controls (DTC P0638 To P2095)
›
DTC P0638
›
Conditions for Running the DTC
Conditions for Running the DTC
The ignition is ON.
The Reduced Engine Power is active.
DTC P0638 runs continuously once the above conditions are met.