Fix code P0504 Jeep
Idle problems, brake switch trouble code P0504 Jeep and Jeep Cherokee
Owners report problems with some 2005-2006 Jeep Liberty and Jeep Cherokee vehicles that have drivability and braking issues when at altitudes above 5,000-ft. The engine may be slow to come up to idle after starting, may shake during the warm-up phase, and may cause a check engine light and trouble code P0504.
If you can’t find an obvious problem, you may have to get the software updated. Chrysler has issued new software to correct these problems—of course it’s not free, mind you. But at least it fixes these problems.
© 2012 Rick Muscoplat