As with many other Jeep owners with the 4.0 engine (hundreds that I have seen) my 2001 Jeep Cherokee's cylinder head cracked. Mine was at 117K miles, and the average mileage for failure seems to be 100K - 120K miles. This is a definite design flaw. My Jeep was well maintained and should not have had a cracked cylinder head. I ask NHTSA to contact current owners of Jeep 4.0 engines to really see how often this fault occurs. Chrysler seems to take no responsibility for this, which is why I am asking the NHTSA to investigate.

- Cheektowaga, NY, USA

In the 2000 and 2001 Cherokee with the 4.0 engine head casting 0331 Chrysler knew about the cylinder heads cracking. In 2002 they contracted with tupy manufacturing in brazil to remake the head casting that ran until the 4.0 was stopped being used by them. Mine has since cracked and Chrysler says that no factory recall was done and such I'm stuck with a cracked head that they knew was faulty.

- Pasadena, MD, USA

The contact owns a 2001 Jeep Cherokee. When the vehicle was powered off and restarted within five minutes or longer, the vehicle would hesitate to start or have a rough start and the check engine warning light illuminated. The vehicle was taken to an independent mechanic where it was diagnosed that the third cylinder failed. The vehicle was not included in NHTSA campaign number: 02V104000 (fuel system, gasoline). The vehicle was not repaired. The manufacturer was not made aware of the failure. The failure mileage was 155,000.

- Rogers, MN, USA

Slowly loosing antifreeze, antifreeze mixed with oil. Found to be cracked head, apparently a common issue with this vehicle. Replaced head. A few months after replacement of head, started to loose antifreeze again replaced head again in Nov 2014. Had vehicle back for one week, lost all antifreeze, mixed with oil again. Have been told that 2000 and 2001 Jeep Cherokee and Grand Cherokee have a very high rate of this happening. There should be a recall.

- Prospect, CT, USA

After loosing coolant at about a 1/2 per week, finally decided to pull the head and check to see if it has the famous Jeep 4.0L, 0331 head casting and is known to be weak. Yep, I have the bad head with cracks. There should be a recall for this as it has a high failure rate.....

- Marshall, VA, USA

Car will not start on the first try, and when I did get it running the check engine light was on. Took it to a mechanic when we started the car the engine light was out and when he put the tester on it pulled no codes and no monitors. Said they had all been erased. I have had the car stall on my when sitting still, the chime works intermittently when you put the key in the ignition, the head lights will sometime stay on and sometimes turn off rightaway when you shut the car off.

- Washington , PA, USA

Started noticing loss of oil pressure and then coolant. The engine continues to run fine but has gotten to the point that its losing 1 gallon of anti. Every two weeks or so. When I started to look around on line and other places, (junk yards) everyone I talked to says they have had the same problem with their Jeep. Why if D.C. produced these faulty heads on their Jeep didn't they recall them to fix?

- Creston, OH, USA