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Old 10-24-2014, 10:26 PM
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Exhaust Filter Blocked

Just more than 300km on a brand new GC 2014 V6 Diesel and the warning came up limiting speed to 60km/h and only 3rd gear. The recommendation on the dash is to drive it at highway speed??(60km/h) to rectify the problem. How the hell is this already happening at just more than 300km on the clock?

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  #2  
Old 10-24-2014, 11:24 PM
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Re: Exhaust Filter Blocked

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Originally Posted by Leon C View Post
Just more than 300km on a brand new GC 2014 V6 Diesel and the warning came up limiting speed to 60km/h and only 3rd gear. The recommendation on the dash is to drive it at highway speed??(60km/h) to rectify the problem. How the hell is this already happening at just more than 300km on the clock?
It happens if you idle too much or drive short distances and lower speeds. The vehicle can't clean (regen) the filter without sustained operation over 50 mph. In my experience, the DPF can reach 80% and warn you to drive with as little as 2 to 3 hours of idling and/or 60 miles of city only driving. When you see the warning to drive...DRIVE. Do not put it off or it will go into limp mode (as yours did) and a dealer visit is required. All new diesels must have a DPF and this is how they work. If you drive 15-20 miles at highway speeds once a week and avoid prolonged idling, the vehicle will take care of cleaning it's filter with no warnings.
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Old 10-25-2014, 02:32 AM
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Just had the tech out. Code U1424. He did clear the code but it came back up again. I must take the car in on Monday. Very dissapointed as even according to him it is impossible to have a exhaust filter blocked after 300km. Only had the car for a week. So every week from now on I will have to take the car to the dealer if there is any truth in the current code.
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Old 10-25-2014, 08:20 AM
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Quote:
Originally Posted by ExcursionDiesel View Post
It happens if you idle too much or drive short distances and lower speeds. The vehicle can't clean (regen) the filter without sustained operation over 50 mph. In my experience, the DPF can reach 80% and warn you to drive with as little as 2 to 3 hours of idling and/or 60 miles of city only driving. When you see the warning to drive...DRIVE. Do not put it off or it will go into limp mode (as yours did) and a dealer visit is required. All new diesels must have a DPF and this is how they work. If you drive 15-20 miles at highway speeds once a week and avoid prolonged idling, the vehicle will take care of cleaning it's filter with no warnings.
Thats incorrect. It's a common misconception. There is either an issue with the DPF or sensors. Ours gets driven only 5km per day. The regen happens at 20km/hr if it needs to. Highway driving just minimises the need to enter a regen mode by passively regenerating. My wife freaked out when ours started regeneration in traffic. But it still worked.

Edit: the last 20% of the regen was while my wife was parked.
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Old 10-25-2014, 12:02 PM
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Re: Exhaust Filter Blocked

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Originally Posted by iboughtajeep View Post
Thats incorrect. It's a common misconception. There is either an issue with the DPF or sensors.
I am not incorrect. I was simplifying for a new owner. I monitor regen activity with a gauge and it is actually possible to finish a normal regen sitting still if you manually hold RPMs above 1200. Regen will also attempt to start at speeds lower than 50mph. The manual says drive at 50 mph because the DPF reaches it's peak temperature under flat ground 50mph conditions.
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Ours gets driven only 5km per day. The regen happens at 20km/hr if it needs to.
Are you saying an "active regen" at 20 km/hr Is when you see the message on the EVIC to drive? If you are seeing this, you are 80% full and one failed regen away from limp mode and a dealer visit. This is risky.
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Highway driving just minimises the need to enter a regen mode by passively regenerating. My wife freaked out when ours started regeneration in traffic. But it still worked.
ALL regens occur because the engine actively dumps raw diesel into the DPF to incinerate the soot. This occurs without notification anytime the DPF exceeds 20% soot capacity, the engine is warmed up, and above aprox 40mph. When you see the message on the dash, it has been failing to regen normally for a while and has reached 80% capacity. At that point, it WILL force a regen and REQUIRE you to drive until it is done. You need to inform your wife to keep driving. Again, this is the LAST regen attempt..not just an "active" regen. Stopping and risking that it may fail is not a good idea. Limp mode and a dealer visit is the next step.
Quote:
Edit: the last 20% of the regen was while my wife was parked.
Be glad she didn't turn it off!

Your driving pattern is not allowing normal DPF operation. Add a 20 minute trip on the highway to your weekly routine and don't idle unnecessarily if possible. I would suggest you re-read my first post or prepare for trouble over the long run.

---------- Post added at 10:52 AM ---------- Previous post was at 10:41 AM ----------

Quote:
Originally Posted by Leon C View Post
Just had the tech out. Code U1424. He did clear the code but it came back up again. I must take the car in on Monday. Very dissapointed as even according to him it is impossible to have a exhaust filter blocked after 300km. Only had the car for a week. So every week from now on I will have to take the car to the dealer if there is any truth in the current code.
No, every week, if you allow it to regen, you will enjoy your modern diesel powered jeep.

For the record, in 26k miles of ownership, I have NEVER seen the dash message that says it is 80% full. Eliminate unnecessary idling and drive non-stop at highway speeds continuously for 20 minutes once a week to prevent DPF issues.

---------- Post added at 11:02 AM ---------- Previous post was at 10:52 AM ----------

Quote:
Originally Posted by Leon C View Post
Just had the tech out. Code U1424. He did clear the code but it came back up again. I must take the car in on Monday. Very dissapointed as even according to him it is impossible to have a exhaust filter blocked after 300km. Only had the car for a week. So every week from now on I will have to take the car to the dealer if there is any truth in the current code.
After some thought, I recall that several new owners had the same issue the first week after taking delivery.

Our diesel Jeeps idle a lot when new as they are waiting to be loaded and unloaded for transport. They also are idled during inspection at the factory. The dealer may also allow excessive idle and/or short trip test drives. Your DPF may have been close to full the day you took delivery.

Get the dealer to force a stationary regen then you will have a clean DPF and continue to drive as usual. My initial advice is still applicable but your normal driving pattern may be enough to keep the DPF clean. The other poster's is not because he is getting warnings.
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