2006 CRD Check engine light - JeepForum.com
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post #1 of 3 Old 01-06-2014, 11:54 AM Thread Starter
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2006 KJ Liberty 
Join Date: Jan 2014
Location: Sioux Falls
Posts: 1
2006 CRD Check engine light


In mid-November we purchased a 2006 with about 95k miles on it. Since the weather was warm (for fall in South Dakota), was filling with #2 diesel. We had a cold snap in early December and the Check Engine Light came on one day. I went to a local auto parts store to read the codes and their reader indicated "no codes" even though the CEL was on. Puzzled, I stopped by a fuel station and topped off the tank with #1 diesel (would have been about 40% #1). Upon restarting after the fill up, the CEL was off.

Since the first time, the CEL has come on two times. I did not try to read the OBD in either case. Both times, I filled the tank (first time it was 1/4 full, the second about 1/2 full) with #1 and #2 with the goal of about a 50% blend (I have not found a local station selling a blend). The CEL light stayed on when I restarted after fueling, but after running errands, the CEL was off by the third or fourth time I started it up.

Has anyone else had a similar experience? Any thoughts on why I could not read any codes the first time? Is there a OBD II reader that is "better" for Liberty CRDs?

Thanks for any advice!


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post #2 of 3 Old 01-06-2014, 06:47 PM
2005 TJ Wrangler 
Join Date: May 2006
Location: Grand Forks, ND
Posts: 3,006
I would have expected most if not all stations in your neck of the woods should be pumping winter blend fuel by now. Usually by mid to late October many stations up here are already converting to winter blend.

Your CRD will be a lot happier if you do a few things. If you have not replaced your fuel filter since purchasing (under hood - bolted to the fire wall) it would be a real good idea to do. Through out the winter, add 12oz of Power Service in every fuel fill (helps keep your fuel from gelling). Another real good idea, since diesel fuel has reduced lubricity since the "05" mandated USLD (ultra low sulfur diesel fuel) came to market - I would suggest that you add 4 to 8 oz of Super Tech (available at smallmart) outboard motor oil to each tank fill up. It blends into the fuel quite well. Your CRD will thank you.

Has the timing belt been changed on your CRD? It needs to be changed (along with other needed parts) by 100K. A belt failure could be terminal to the 2.8 VM engine - or at least a healthy repair cost.

05 TJ RME 42RLE with some things
05 KJ CRD 545RFE, GDE Eco tune, Franky II, Al's 4.5 A-arms, JK Rubi Moabs, Silent Armors 245-70-17's, Spidertrax Adapters, Rola Basket, Fumoto Valve, Pinch welds pounded - Sold 2015
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post #3 of 3 Old 01-07-2014, 07:00 AM
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2006 KJ Liberty 
Join Date: Sep 2013
Location: Dripping Springs
Posts: 23
Only hard codes get stored. Soft codes are not. Once you turn the engine off soft codes are lost.

06 KJ CRD 545RFE, AMSOIL Oil & Filter
48 T4 Willis Pickup
93 C3500 Chevy 6.5 Turbo Diesel
84 C7500 Chevy Flat Bed 366 gaser
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