Two problems related to crankcase (pcv) have been reported for the 2007 Jeep Grand Cherokee. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2007 Jeep Grand Cherokee based on all problems reported for the 2007 Grand Cherokee.
While driving on the interstate at 65 mph, the vehicle's engine stalled. I had to put the vehicle in neutral, turn the ignition off an back on to restart it. This first happened just after the 30 day warranty was over, as I bought the vehicle used in may of 2012. Since that time, the vehicle has stalled at highway speeds or when slowing down for a stop on dozens if not hundreds of occasions. The spark plugs, egr valve, ignition coil, pcv valve and map sensor have been changed to no effect. There are no meaningful diagnostic codes stored in the obd-ii system. I feel this condition is very dangerous, as I never know when the vehicle will stall, causing a loss of power steering and brakes, and the ability to accelerate out of harm's way. It is my understanding that many of these same vehicles with the same engine are having similar issues. I can no longer let my wife or teenage son drive the vehicle because of this condition.
I bought this Jeep on 9/20/2013. The truck is equipped with the 5. 7 l hemi engine. Over the first 50 days and 1,157 miles of ownership I have encountered 18 episodes of the vehicle stalling, with 14 of those stalls occurring on major highways in traffic. The stalls occur with no warning. The vehicle immediately decelerates to a stop and I am left with no power, no steering and no brakes. One dealership blamed it on a bad battery. The dealership which sold me the Jeep diagnosed the problem as a m. A. P. Sensor, which they replaced. That did not correct the problem as the stalling problem continues to occur. The most recent was on 11/9/2013 while driving in the center lane of the PA turnpike at 65 mph. The Jeep stalled and came to a stop, with a semi tractor-trailer behind me. I have no idea how that truck driver was able to swerve in time to miss me. Mechanics and on-line forums identify possible causes for the stalling as 1. A defective (ecm) electronic control modules; 2. Shorts in the wiring harness; 3. Sparks plugs; 4. Egr valve; 5. Ignition coil; 6. Pcv valve; 7. Transmission solenoid pack. There are no diagnostic codes stored in the obd-ii system. One school of thought is that 2007 Jeep Grand Cherokee and commanders equipped with the 5. 7 l hemi engine are extremely sensitive to radio frequency interference from the waste spark on the coil. As other complaints have noted, this is an obvious and persistent problem with Jeeps equipped with the hemi engine, and Chrysler has turned a deaf ear to the complaints. Perhaps they are waiting for the fatalities to occur. Why NHTSA hasn't done more to order a recall is beyond my comprehension. The problem has been reported on for years with no action taken by Chrysler. This Jeep is, for lack of a better word, a deathtrap. At best it cannot be trusted, it is unsafe and unreliable. At worst it is an accident waiting to happen!.