Exhaust system regen 4 times in a month and DEF level not changing - Jeep Garage - Jeep Forum

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Old 08-27-2016, 10:01 AM
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Exhaust system regen 4 times in a month and DEF level not changing

What gives, guys? For the 4th time in the past several weeks I've gotten the exhaust regen message eventhough I've driven a ton. I also noticed a while back that I hadn't been prompted to refill my DEF so I checked the level on the EVIC and it was about 20% full a month ago. Just checked and it's still at the same level. These might be unrelated events but thought it seemed odd. Any ideas? I'm scheduled for a service on Tuesday to check it out but I'd like to have some clue about what's going on with it before I take it to them.

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Old 08-27-2016, 10:51 AM
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If "driven a ton" includes "regularly engaging in more than 15 minutes at a time of continuous driving at highway speeds" then there's likely to be some sort of problem.

However, if you've just been driving around town (or maybe idling for long periods), then your vehicle may not have been able to effectively regen the DPF. If you've been doing turbo launches that will also fill your DPF quickly.

The DEF aspect is unrelated to the DPF/regen. The DEF gauge is based on a crappy, imprecise ultrasonic sensor and the displayed gauge value is "filtered" by algorithm.
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Old 08-27-2016, 11:16 AM
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Re: Exhaust system regen 4 times in a month and DEF level not changing

There is no direct correlation between DPF regens and DEF usage. Your DEF usage may be normal. Depends on how far and hard you've driven in the last month, and how this measurement compares to previous ones.

You're primarily concern about the regen frequency, which implies it has changed noticeably. Since there are no faults being detected(??) the regens appear to be doing what they're supposed to. What about the fuel you're now using? Any changes there, specifically with bio content or potential quality concerns?


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Old 08-27-2016, 11:58 AM
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Re: Exhaust system regen 4 times in a month and DEF level not changing

I've driven at least 1500 miles in the past month including several hours at highway speeds. My Jeep has 30k miles on it and the regen cycle is clearly different from its norm.

My fuel source hasn't changed - still the same Kroger diesel I use when I'm not out of town.
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Old 08-27-2016, 12:33 PM
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Re: Exhaust system regen 4 times in a month and DEF level not changing

Quote:
Originally Posted by torifile View Post
I've driven at least 1500 miles in the past month including several hours at highway speeds. My Jeep has 30k miles on it and the regen cycle is clearly different from its norm.

My fuel source hasn't changed - still the same Kroger diesel I use when I'm not out of town.
Since you already have a service appointment scheduled, look for them to service the EGR. I wouldn't suggest it to the writer but see if they come up with it on their own. Also, maybe replacement of intake air filter.
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Old 08-29-2016, 10:38 PM
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Re: Exhaust system regen 4 times in a month and DEF level not changing

What is the sensor or method by which the vehicle determines it's time to burn off the DPF? Perhaps the ECU is getting "false" info and thus triggering the regen? I'd look into that logic circuit first...bad info fooling the computer to do a regen...
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Old 08-29-2016, 11:15 PM
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Re: Exhaust system regen 4 times in a month and DEF level not changing

DEF is not used during a Regen, so having a Regen too often would help explain why you have used very little DEF. Don't worry about the DEF usage unless it triggers an error code.
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Old 08-30-2016, 04:15 PM
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Re: Exhaust system regen 4 times in a month and DEF level not changing

Quote:
Originally Posted by carqwik View Post
What is the sensor or method by which the vehicle determines it's time to burn off the DPF?
The ECM uses pressure sensors upstream and downstream the DPF to find out the pressure differential. Once this differential is above a set limit, it will flag a regen request. The regen request will be served once the vehicle is at highway speeds (some folks on the forums indicated they managed to run a regen at street speeds by maintaining high RPM). All this is done without any EVIC notice. If a regen request is not served beyond a set limit (higher than the previous differential), the ECM will generate a EVIC warning asking the user to drive at highway speed. If the regen request is still not served beyond this differential limit (usually at a 90% full DPF), the ECM will put the vehicle into limp mode.
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Old 08-30-2016, 08:50 PM
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Re: Exhaust system regen 4 times in a month and DEF level not changing

Netboy, doesn't the ED use two different methods of measuring DPF blockage and compares the two? At least that's what I remember from previous GDE posts.
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