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Old 05-26-2010, 04:51 AM   #1 (permalink)
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P2146 & p201 & p203

Hang with me everyone...New girl on the block. I know NOTHING about engines but I'm a quick learner, and finding I'm learning about Cummins. Just some basic questions....

Just sold my OLD F350, and bought a 2004 Dodge Ram 3500 ST Dually. Always heard great things about Cummins and was excited to get this truck....

These codes have popped up.
P2146
P0201
P0203

Had a new wiring harness put on it, and it fixed the P0203. But not the other two codes, they popped back up after driving it for an hour.

1. Are these commons issues with the Cummins?
2. What do I have to replace to fix the P2146 and P0201?

The dealer I bought it from is an idiot and is fighting me on this and I'm tired of dealing with it, I just want it fixed so I can use the truck to haul hay and horses and various other farm tasks. It's getting rough having to borrow my friends Toy-peedo to get my work done around the place.

Any help is appreciated and please use simple words...like I said I'm just learning.
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Old 05-26-2010, 07:48 AM   #2 (permalink)
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What harness did you replace? Was it the one that was built into the gasket?
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The problem is that common sense isn't so common anymore...
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Old 05-26-2010, 08:04 AM   #3 (permalink)
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unplug the first connector on the rocker box and check resistance between pins 3 and 4. It should be less than 10 ohms. If its more than that, take the valve cover off and check the resistance at the #1 injector. if that is less than 10 ohms, check each wire from the injector to that first connector
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04 F350 CCLB Cummins swap in progress
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SOLD-03 QC/LB 4x4 5sp
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The problem is that common sense isn't so common anymore...
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Old 05-26-2010, 09:20 AM   #4 (permalink)
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What harness did you replace? Was it the one that was built into the gasket?
He said he replaced all 3 harnesses. That's all I know.
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Old 05-26-2010, 10:37 AM   #5 (permalink)
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hmm... could be the injector itself then... try that test and let me know what you get
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Old 06-18-2010, 09:55 AM   #6 (permalink)
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OK, the dodge dealer took it, and said my fuel injectors 1 and 3 were bad so they replaced them.
Picked it up and drove it around, it popped back up with P0203! This is so freaking frustrating!

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Old 06-18-2010, 11:30 AM   #7 (permalink)
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this excat same thing just happened on my 06, the stealership told me there was nothing wrong with my truck. They even had it for a weekend and kept telling me theres nothing wrong. My truck popped the same codes and started running funny. So I picked the truck up and drove it for a couple more days and sure enough it threw the same codes again an felt like it was running on three cylinders. So I got the truck back home and took the valvecover off and cleaned and inspected every connection and the valvecover gasket(which is the injector wiring harness)and tested the injectors and everything seemed to be ok. Then I put the valvecover gasket on and hooked all of the connections back up and now for the last 3 weeks the truck has been totally fine.
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Old 09-04-2011, 10:17 AM   #8 (permalink)
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p2146 p0203

Is this a common problem? Is this a wire harness problem? I've replaced all the injectors in my 2500 05 quad cab. I've completely taken the harness wires to the first bank apart and rebuilt them to assure good contact. why? I've figured out that when the choking begins if I unplug that first wire, Clean it with electronics cleaner and apply some dielectric grease, I got another months use. Sometimes just shuttuing it off for 5-10 minutes will solve the problem. I've had this problem for about one year now. Pretty much spent about 4000.00 with dealers and other mechanics and now am commited to running it as is. Just tired of throwing dollars at it. A thought-maybe drill a hole in the fire wall and attach a cable to the first bank wire and when it acts up give it a little shake. The dealer pretty much told me they couldn't get the external harness. So if anyone out there has any ideas or answers it would be greatly appreciated.
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