The check engine light on a 2005 Jeep Grand Cherokee looks like this... Here is a link Check Engine Light It looks like a little yellow engine.
The 2007 Jeep Grand-Cherokee has a V6 engine.
The 2012 Jeep Grand-Cherokee has a V6 engine.
The 2013 Jeep Grand-Cherokee has a V6 engine.
The 2009 Jeep Grand-Cherokee has a V6 engine.
The 2007 Jeep Grand-Cherokee has a 3.7 L base engine size.
A flashing check engine light normally means you have a misfire.
The 2010 Jeep Grand-Cherokee has a V6 engine.
The 2007 Jeep Grand-Cherokee has a V6 engine.
The 2013 Jeep Grand-Cherokee has a V6 engine.
The 2012 Jeep Grand-Cherokee has a V6 engine.
The 2009 Jeep Grand-Cherokee has a V6 engine.
The 2011 Jeep Grand-Cherokee has a V6 engine.
The 2006 Jeep Grand-Cherokee has a V6 engine.
The 2014 Jeep Grand-Cherokee has a V6 engine.
The 2003 Jeep Grand-Cherokee has an inline 6 engine.
The 2004 Jeep Grand-Cherokee has an inline 6 engine.
There are pages and pages of things that can cause a check engine light. You need to have it checked with a scantool. Then the code can be diagnosed and repaired.