Yes NTK is MOPAR OEM.

I would check the ground straps first clean/replace.

Those codes are resistance related so I would guess grounds but ...since you had one code before you changed sensor and multiple after I would check wiring , things you touched.

Check the sensor you changed make sure those wires didn't get twisted together. Ive pulled a couple out that were connected then screwed in twisting the wiring, one pulled out of a connector. Screw it in then connect it. The connectors are a pain in the ass and pulling on and moving the wires around can crack or pull on wires and connectors

 

SteveV8,
What are ground straps, not familiar with that term.
I did have trouble pulling the sensor connector apart and man handled it. Other than looking at connector is there a way to test with a meter?
If I did screw up the connector that is on the wire bundle how do I replace that? Cut and splice a new one?
Thanks Bob

 

The only time I seen 4 at a time, there was a blown fuse.

 

Yes the heater circuit fuse is an excellent possibility, I was just looking at that. Check fuse in power distribution block on fender its a 15 amp and noted in my fsm as #16 (mines a 2004 FSM)

The relay for the heater circuit is in that box also which is another possibility.

ill look for the ground connection location for you. ground straps are just connections to the engine or components to ensure the ground path for the electrical system. The most prominent easy to see example is the flat strap from firewall to hood.

The ground connections for the harness with he o2s is on the pass side of engine just rear of the distributor/cam shaft module eyelet comes out of harness and attaches to engine block.

 

It's also possible with those miles that you could have issues with your mini cats which are warm up cats. That is the code (0153) that started my head scratching for awhile. I replaced all of the sensors with OEM and then it would only set codes when off road. I drove it all the way to Moab, no codes. First trail, set the code. Finally the guts of one of them let go, looked like a big wad of gum and blocked the exhaust so I had no power. New warm up cats obviously solved the issue.

 

All good information. I'll get right on to checking the sensor plug and fuses.

Just wondering how you can determine if the cats are good. To check the cats do I need to pull off the exhaust pipe and take a look. If the insides of the cats look intact are the cats good?

 

Trying to get the stock 05 Rubicon to pass the smog test

I have read that Jeep on board computers go haywire sometimes and will keep you posted on fixing this problem for the benefit of others.

Problem all 4 O2 sensors code bad after replacing one

Checked the fuses and all seem good. Actual #16 is missing on my Jeep, 05 Rubican. Since I don't have one and no codes before this, guess I don't have to have one.

Looked for a loose ground finding nothing at this point that appears loose or faulty. I'll keep looking though.

O2 electric plugs look OK even though I broke the plastic lock off one, which really pissed me off, it still pushes snug and tight. guess I will have to safty wire to make sure it remains locked tight.

* Got talked into putting in a Mopar O2 sensor from the Jeep Dealer. As noted on the original post I changed the O2 sensor for an O'Reiily NTK. I found a chart that list the O'Reiily as a substitute rather than OEM even though the Mopar one is an NTK too and looks exactly the same it does have a different part number.

So I got to start somewhere even though I am not happy to spend $65 for a new o2 sensor and then replace it with a $85 o2 sensor

Cleared the codes and now driving to get data for the required smog test. If the codes come back the next step is the dealer wants to reflash the PCM.

I'll take words of wisdom from the forum. Thanks Bob

 

What did you find was the problem? I have an 05 also that is doing the same thing. I replaced the pcm, 02 sensors map sensor and speed sensor, and continue to have problems.

 

Some similarities in this thread. Deals with wiring harness I believe.

http://www.rubiconownersforum.com/forums/19-general-tech/70113-2004-2006-pcm-lifetime-warranty.html

I'm looking at it for my 06 which is giving a IM code of not ready. It may be worthwhile to run the test and point this out to dealer they may have forgotten about it or not have checked.

 

I have reoccurring codes p0031,037,051,057, and once in approx. 80-100 miles it throws a p0344. I have replaced all 4 02 sensors with NTK replacements and replaced OPD and cam sensor. code shows its an intermitant signal loss so have looked at grounds and have replaced negative battery cable just to verify a good ground

 

scope the sensors and report back. The PCM will sub "known good values" in scan data, so datastream is of no use with 02 codes. The sensors are the same as all other makes, except Chrysler adds a 2.5v sensor bias to the normally 0-1v sensor signal. It's possible that the signal got pulled low due to a defective sensor. They DO have a habit of chafing the wiring at the firewall pinchweld, so check the harness above the trans. Clear DTC's and disconnect all sensors, see if you can induce codes to match your situation (ie: heater codes and low circuit codes per sensor disconnected after code clear). Holler if you need anything.

 

OP here. I have been waiting after the complete fix to give a report. As the thread is active I will report what I have so far.

Bad PCM based on local shop diagnostic tests and also based on the experience of the mechanic.

I first changed out the O2 sensor with a NTK from Oriles auto parts. After installing the new O2 sensor five codes show up indicating all the O2 sensors were bad.

As I was confused and looking for help I asked the dealer and they said I needed to buy a Mopar O2 sensor. So bought a Mopar NTK and still all the codes indicated all the O2 sensors were bad. So now into O2 sensors for $65 and $100 or some thing like that. The shop charged me $98.00 for the diagnostic tests.

The shop recommended I send the PCM to BBA Remanufacturing Inc., 300 Myles Standish Blvd., Taunton, MA 02780, us.shop.bba-reman.com.

The price for repair is less than $300.00 they say. I sent it in last week and have not heard back from them yet.

I will post when I have more information.

Just a note, the mechanic told me that Jeep PSM's have a design problem. Computers only need low voltage to run and higher voltage will damage some components. Jeep PCM's have additional voltage running through it, he claims, but used for other components. I'm told the proper design is to have the computer send a signal to a relay outside of the mother board to power other devices. I don't have any first hand knowledge about this but if true then Jeep designed a headache for us.

 

I haven't torn into a PCM but I'm wondering how they can diagnose a problem down to a component and then "repair" it. Chances are the electronics are potted in some kind of resin for heat sink purposes and to eliminate vibration-induced component failures.

On the '05-'06 PCMs (and other years?), alternator regulation is done in the PCM which probably means sinking quite a bit of alternator field current in the module (heat in other words.) Also the tranny control module is integrated into the PCM - lots of things being controlled from one box. This is for manufacturing efficiency and not ideal when there's a problem.

 

OP here with update on the bad Jeep Rubicon 2005 PCM/ECU. Received a call and email from the company I sent the Jeep computer to for repair.

The PCM is the problem, bad news is it can't be repaired. Attached is the email sent to me by the repair company. I am showing you the email for a reference to anyone with a similar problem. I have purchased the remanufactured PCM from them.

Good Afternoon,

We have your ECU here for your 2005 Jeep Wrangler. Unfortunately we were unable to repair your unit. The codes are hard set into the unit and we are not able to clear or repair the unit. However, I do have one at my stock location if you are interested, the exchange unit would be $475 plus shipping. There is also a $100 fee to program the unit. We will need your correct VIN and Mileage to do so. It would come with our lifetime warranty as long as the owner stays the same of the vehicle .
Thank you,

Brianna Costa
Customer Service

1-866-573-2740

BBA-Remanufacturing USA
300 Myles Standish Blvd.
Taunton, MA 0278

 

That's what I was expecting, but at least they confirmed the PCM is bad. Their prices are very competitive based on my research for PCMs and programming.

Thanks for the follow-up report.

 

Wow, the PCM is spendy!

 

Aren't computers neat? In that respect I sure liked my '80 CJ better, but then you look at the increase in HP and torque from basically the same engine and it help justify the modern technology. I just hope that the PCM doesn't go belly up in the middle of nowhere!

 

I think new ones are ~$900.

 

OP new report, the misery continues.

Installed the remanufactored PCM from BBA and the Jeep would not start and got error code "Jeep PCM not programed." I had paid an extra $100 for programing and this was suppose to be plug and play. BBA technician said some time you need to take it to the dealer for programing. But it was suppose to be plug and play and my mechanic said it should be P+P and that's how they are sold by other internet sellers. So think they either didn't program it or the unit is defective.

The dealer said I'm to busy call me next week and I'd have to tow 30 miles and the secretary at BBA was a crank so I just sent it back. BTW no refund clause, they now say, until I send them the recipe for a replacement PCM %$#@!!

Now looking for a reputable PCM seller, again. Lots of complaints listed for these type of companies. Anyone know of a reputable PCM remanufactured I can get a PCM from?

 

Not trying to be snarky, but did you ask the dealer. I would also try rock auto.

 

Just called the dealer. Said 3-4 week back order for a remanufactured one. Cost PCM $741 programing $175 some other charge $121 = $1037 then tax. Plus they need the Jeep in the shop.

Just talked to Soloauto.com, tech says they don't do 05-06 jeeps any more because the pcm's have too many problems

Rock Auto does not show listing for Jeep PCM and no phone number.

I'm getting warn down on this though. Having Chrysler regrets.

 

Man that's a bummer!

Have you tried wrecking yards? carparts.com may offer you something.

I had to go through several when I did my v8 swap and the final product came from a junk yard.

 

Made a call on your behalf. Needed your vin. PM sent. Good luck.

 

Daveys Jeep parts might be a source for a used PCM unit- worth a call.

Did you check the recall service bulletin I posted earlier?

 

Update from op:
Still having big problems. Sent the PCM back to BBA and got sour response from them. Getting my money back looked hard and getting another PCM from another place looked worse.

So I asked them to reprogram and send it back. They did send it back but did nothing and also sent no corespondence. Now that they have my money their phone conversations are not nice either. Had the Jeep towed to the dealer in the next town because our dealer here seems to not want my business based on how they behave and prices they want to charge.

New dealer tried to program the PCM but... Would not start at first because of some anti theft key problem. But they called the next day and said they got pasted that but now the transmission control module will not recognize the new PCM and gives error code. Will call again tomorrow and see if they fixed that. But the cost is going up

SteveVB, I'm going to show the service bulletin to the dealer and see what that is worth.

Anyway, the jeeps been down over a two months. From what I have gleaned out of the internet searches the 05-06 Jeeps have a faulty PCM and the outfits that deal used ones to us are taking advantage of us and chances are 50/50 they send you a busted one. The price for the 05 PCM is hundreds of dollars more than other jeep PCM's and no one will give a straight guarantee. Googled complaints about the companies are extensive. They are ripping us off and Chrysler appears to have abandon us as well. Excuse the tone but it is a huge hassle and costly too.

One good thing is I have had friendly help from my fellows on this forum. I thank you and it helps a lot.

 

The TCM is integral to the PCM for the '05-'06. Previously the TCM was a separate module.