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Jerking followed with MIL and some trouble codes

306 Views 16 Replies 5 Participants Last post by  dodgerojo
Hello there,
got another problem with my European version of Dodge Caliber SXT (2.0, 103kw)

I am experiencing a lot of jerkiness during the acceleration, even if I put my foot slightly on the gas pedal to keep the speed, car starts to jerk. Also I noticed a poor fuel economy.
I was pretty sure that is some problem with the diesel quality and started to buy diesel from another gas station. But the problem persists and it is even worse.
Today I drove back from work and the MIL appeared - I stopped the car and connected an OBD II adapter and made a little diagnostics.

There were some codes:
P2002 - Particulate trap, bank 1 - efficiency bellow threshold
P0101 - Mass air flow (MAF) sensor/volume air flow (VAF) sensor - range/perfomance problem

P2245 - Heated oxygen sensor (HO2S) 1, bank 1, reference voltage - circuit low
P0131 - Heated oxygen sensor (HO2S) 1, bank 1 - low voltage.

Tried to clean the codes, but the problem persist.
I think all these codes are connected, so I do not know where to start, maybe check the MAF sensor first, then HO2S and the DPF last?

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I'm not familiar with diesels, but...

I would just replace the O² sensors - they're cheap, fairly easy to get to, and can't hurt to put new ones on.

MAF sensor, also would just replace it for the same reasons. Someone else here can chime in on what it really is/ called/ does... I forgot where that conversation went.

Soot? No idea. But I get the feeling you may want to replace the air filter, too.

That's all I got.
Hello 672aq, I made a little searching on Google and I will start with cleaning the MAF sensor, if it not helps, then replacing it. The P2002 code is DPF related and should be solved by DPF regeneration process, will try both things tomorrow and I will report an update
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Hello good, You can try driving for about 30 minutes with the engine warm above 2000RPM to regenerate the particulate filter. Do not put the 6 speed, circulate in 5 or 4 speed but above 2000RPM. You try and tell us. But first, check the oil level so that there is no diesel in the crankcase to avoid damage due to oil feedback. Greetings
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Hello there, tried some hints and tips and there are some updates:

Yesterday I dissasembled the MAF sensor, cleaned it and put back - the trouble code dissapeared :)
Also tried to check by OBD II diagnostics if the sensor is running in real-time, when RPM rising, the value of air going thru the sensor is rising too, so I think the sensor is OK.
Also the jerkiness is gone 💪🙌

Only code that I can not get rid of is P2002 - the DPF related one - MIL still lighting.
Tried to drive yesterday on the highway for about 20 minutes with 3K RPM - nothing changed.
I made a little research and found that first thing what should I replace with this trouble code is the differential pressure sensor. I found this part in the shop nearby, so I grabbed it and replaced today. It looked very easy to do, but it was kinda difficult, especially to pull out the old sensor :D
After the replacement of differential pressure sensor the problem persists - still got the P2002 code.
Tried again the highway - 40 minutes with 3K RPM, sometimes 4K RPM- nothing changed. After I left the highway and drove the last 10 minutes back, I noticed my car is losing power, to 2K RPM the car normally accelerates, but there is no power over the 2K RPM - can this behavior been caused by the DPF regeneration process?

Any other suggestions?
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Have you cleaned the DPF? Also check you have vacuum, the pipe gets loose and may need a zip tie.
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Hello good,
When the vehicle does not perform. It has a low performance, the DPF may be saturated. It is rare that when driving above 2000RPM it does not enter regeneration mode.
A misfiring or EGR could be the problem.
You can look at the large tubes that come from the intercooler to the throttle body that do not have a cut and lose air pressure. In this case, you would see oil stains in the tube and you would hear a whistling sound like a loss of air.
In TDIs before yours it is quickly identified because the car makes black smoke. When you wear a DPF you don't see it since the carbon particles are retained in the DPF. When a hose from the turbo to the intercooler cracks you have a loss of pressure and to go at the same speed you have to accelerate more with the consequent saturation of the DPF.
Any part that you replace with another you have to do a DTC code erase or the car will continue with the fault.
Even with saturation greater than 60% of the DPF, the car goes into MIL Light and Engine Failure Light protection mode.
I can't just say check EGR and turbo hoses.
If all is well, connect an official diagnostic machine and do a forced regeneration. If the saturation is higher than 65%, you either have to use a spray like DPF Doctor from Innotec Automotive to lower saturation.
You can look at how much carbon there is in the EGR and if it works since if it is open it will give you failures related to the flowmeter in addition to lack of performance. I think your EGR is electronic and over time a pinion is crowned and stops acting correctly.

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Aleks: I have not cleaned the DPF since I got the car. I checked all the visible hoses with flashlight and I can not see any cracked, damaged or loose hose.
Dodgerojo: Yes I understand, I will check again the hoses from intecooler, also I will go tomorrow to my friend with better diagnostics, so I hope we will find out some more informations about this problem. I drove my car today again a few kilometers to the shop and the power is pretty weak, I can say the car goes like 50% of the power, engine is reving but the car do not accelerates, it feels like something air related is clogged.
I will try the forced regeneration tomorrow and I will let you know guys, thanks for your time and knowledge :)
Driving with the code p2002 for too long can unfortunately can cause a limp mode to ensue! The computer trips it after a certain amount of miles incase its seriously clogged up.
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Hello guys, got another update:

I bringed my car today to my friend and he has the Xtuner diagnostics, we connected it and made some DPF reset, I think it reseted the value of the DPFE sensor that was replaced yesterday - MIL dissapeared and the P2002 code too. I tried the test drive for about 25 kilometers, half normal roads, half highway - no MIL to this moment, I hope it will not come again in a next few hundreds km. It seems to me like the replacement of the DPFE sensor was the right choice for this problem, BUT! Car still jerks during the acceleration or with the foot slightly on the gas pedal. OBD II scanner showed me error code P2033 after this test drive - something with the EGT sensor, do not think this is related with this jerkiness. So we are now where we was a week ago - but without MIL and the limp mode :D
I have not replaced the fuel filter since I got the car, do not know the attitude of the previous owner, do you think this jerkiness can by caused by a bad fuel filter?
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Hello good. a dirty Diesel Filter can generate clear jerks. But a bad EGR or a bad throttle body also jerks. A bad alternator pulley also jerks. An a/c compressor pulley is also pulling. I don't know, you have to look at everything well. stuck turbo geometry too. The throttle body or EGR is easy to check. The soft shutdown throttle body usually makes a clack, clack, clack sound when stopping the engine. Greetings.
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Thanks dodgerojo, I will start with the fuel filter replacement and I will post an update in a few days, thanks
Fuel filter should be every other service (18k mi).
Mine hesitated on Accel but no codes for that, just don't run cooking oil.
Did you pull off hose to see if tight, put finger over it to feel any pressure. Maybe zip it anyway.
Try the egr cleaner spray can won't hurt.
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Hello Aleks, thanks for your reply.
I checked all the visible and accesible hoses with flashlight, have not found any loose or damaged hoses. I zip-tied some of the hoses because they looked little wobbly. I also tried the EGR cleaner spray to the air intake behind the MAF sensor - did not helped. Also this technique is little sketchy, because all the sediment from the valves going straight to the engine oil, so I will try this again maybe just before the oil change.
I do not know if it is related to the jerkiness, or maybe some strange random, but I think when I use the A/C the car jerks more then if it is off.
It's 'normal' to feel the AC kick on because of the load it adds.
You would not 'see' a vacuum leak - and I do read previous posts.
I drove the car for about 100km from reseting the DPFE sensor and the MIL and the P2002 come back again. I am going to put my car to the service shop to check what is wrong, I think this is out of my capatibilities
Hello good. Yeah. Better take it to the shop. In addition to the DPF, I would almost point to the fact that the EGR stays open and at high RPM it makes you slipstream, redirecting direct gases to the exhaust. giving error in the somda lamda. And this is the fish that bites its tail. Fault in lamda the ECU tries to adjust injection giving faults is MAF etc. If there are no pressure leaks in the intake, almost certainly EGR with an excess of carbon to the DPF. The jerks because if the EGR does not close, part of the pressure goes to the exhaust. It is a vicious circle. But hey, in the workshop they will find the fault. Greetings.
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