CRD with P0402 and Lightning Bolt - JeepForum.com
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post #1 of 9 Old 07-21-2019, 07:24 PM Thread Starter
TyeRant
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Location: Belleville/Peterborough
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CRD with P0402 and Lightning Bolt

I was travelling on the highway climbing a hill when all of a sudden, I lost power and got the flashing lightning bolt and CEL. It went into fast limp mode allowing me to get to my destination. After restarting the jeep seemed fine until I was on the highway clibing a hill and again, flashing lightning bolt and CEL.

When I got home I did a scan and got the P0402. EGR valve code.

I pulled the egr and cleaned it today and made sure the valve opened and closed freely. I re-installed it to see if this fixed it. It did not. Still getting P0402 CEL and Flashing Lightning Bolt.

I ordered a tuning cable to do a test (offroad only) egr delete.

I also ordered some 4.7k ohm resistors for a swirl motor mod.

Could this be someting else? What else can I try?

It will be a week before I get my orders and need to get back on the road soon!

Thanks!


2008 Grand Cherokee North Edition CRD - Stock for now
2003 VW Jetta Wagon TDI
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post #2 of 9 Old 07-22-2019, 06:49 PM Thread Starter
TyeRant
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Well, I think it is fixed.

I am embarrassed to say what the issue was but if it helps someone, I am willing to look like the goof I am. LOL.

A fellow enthusiast suggested that I check my MAF sensor even though I was getting a EGR error code. I got some MAF cleaner and pulled my airbox. Much to my astonishment, I found a chipmunk nest in it! It was full of leaves, nuts, grass and fur. How the heck did it get in there? I vacuumed out all the crap, cleaned the MAF for good measure, installed a new air filter and no more codes or limp mode so far.

Oh well, this gave me a good enough push to get a tuning cable and hopefully I will get on learning to tune soon.

I hope this post helps someone. Hey if it makes you laugh, that is good too. :-)
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post #3 of 9 Old 07-23-2019, 12:50 PM
underscore
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My neighbourhood has a lot of rodents lately so this is very good to know. Which tuning cable did you get? I tried one that works with the diesel Liberty but didn't have any luck with it on the WK (at least not with the software I used).

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post #4 of 9 Old 07-23-2019, 09:05 PM
Donuts31
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I had an engine replaced on my Hyundai (no surprise) under warranty and during the time it was in the shop, a rodent built a nest in my airbox too!
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post #5 of 9 Old 07-25-2019, 12:59 PM Thread Starter
TyeRant
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Quote:
Originally Posted by underscore View Post
My neighbourhood has a lot of rodents lately so this is very good to know. Which tuning cable did you get? I tried one that works with the diesel Liberty but didn't have any luck with it on the WK (at least not with the software I used).
I think I probably got the same one. Saw it on one of the Jeep Liberty CRD youtube vids. It is the MPPS one. I read on one of the sprinter forums that it worked fine so I figured it would be OK for the WK CRD. Time will tell. I home to start messing with it soon. Trying to get a DPF delete pipe first before I flash the ECU. I want to limit the number of times I flash it just in case something goes wrong.

If anyone has any experience with the MPPS cable let us know!

Thanks

2008 Grand Cherokee North Edition CRD - Stock for now
2003 VW Jetta Wagon TDI
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post #6 of 9 Old 07-25-2019, 01:29 PM
underscore
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That's the one I got, though I bought a cheap one and had limited time to play with it so I wasn't sure if it was a bad cable or I was using the software wrong or what. If you have better luck please let me know.

07 WK CRD//QDII//OME MD//OMG WTF BBQ [daily]
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post #7 of 9 Old 08-01-2019, 03:50 PM
DukeLucan
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Quote:
Originally Posted by TyeRant View Post
I pulled the egr and cleaned it today and made sure the valve opened and closed freely.
Was there any problem pulling it out?

I am getting Code P0403 "EGR control circuit/open" on my WK so I'm thinking of pulling the EGR valve. However it looks like insufficient headroom to pull it out without dropping the rear of the engine a few inches. I saw on Youtube a guy removing it from a Mercedes (plenty of headroom) and the valve needed pulling up about 3 inches (as you see from around 1:35) but I only seem to have about an inch of headroom.
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post #8 of 9 Old 08-02-2019, 11:22 AM Thread Starter
TyeRant
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I removed the frame piece nearby that holds the plastic engine cover to give me room. The wiggled it out turning it a bit as well. I had to turn it a wee bit to get enough clearance to get it out. It was tight but I was able to get it out on mine. Hope this helps

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post #9 of 9 Old 08-04-2019, 02:24 PM
DukeLucan
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Thanks, I'll give it a try.
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