I'm new to the Forum but not new to Forums in general. I joined because I just purchased a used 2001 Dodge Ram Van 1500 Conversion. It's a nice ride but needs a little work. I am down to one major issue and a couple of minor issues so.....I came to the EXPERTS. I am getting a P0601 Code which means I need a new PCM. The vehicle runs good and I can clear the code but within a couple of start ups the light is back on with the same code. I have searched the internet and found seveal companies that offer remanned ECU's however I cant find any without a ton of negative reviews. Can anyone recommend a company they have delt with? Or does someone have a Van they are parting out with a known good ECM that I could get reflashed? My van has a 3spd auto tranny with the 3.9 V6. I would definitely appreciate any input.
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Post the ECM number (ends in AB I think) and we'll see if we can find one for you. Have you considered a used one? They're less expensive and if the numbers match you just swap it, no flashing required.
I bought my A-1 Cardone rebuilt from rockauto dot com. It was actually rebuilt unlike the NAPA PCMs which are pulled, spray painted black then boxed, and sold as rebuilt. I've had it for over a year and it works perfectly right out of the box, and still working perfectly.
Last edited by Supradude; 07-18-2011 at 11:57 PM..
Thanks for the help, I have definitely have considered a used one but I was reading on one of the forums that from 2000 up the ECM clears itself once it is unplugged and/or removed from the vehicle. I dont know if this is true or not, so I didnt know whether to pursue that avenue or not.
As a follow up to the issue with the ECM I also took the vehicle and had the battery checked today and it was bad, I havent had any issues with it starting but I was reading how a bad battery can cause codes. Since I had the battery checked the light has went off and not came back on. I have now replaced the battery and will drive it and see what happens (with my fingers crossed). Just in case here is my ECU Part number. P56040 254AD
Ok....need some additonal help. The CEL came back on with the P0601 code so I have purchased a remanned unit from a local computer shop here in Houston. I installed last night (battery was disconnected) and it ran fine, ran fine today to work but at lunch the light is back on with the P0601 code. The guy at the computer shop is telling me that some is frying the computer and causing the code, the technician tells me it is just a ECM thing that nothing has to happen to cause it. The guy at the computer shop is acting like he will not exchange the unit until I verify there is nothing causing the issue. Any ideas on something that can cause the P0601 outside of the ECM?
P0601 is an internal PCM failure code, nothing external can cause it. Tell the computer shop guy that if he wants to play rough, then he has to verify that his used/rebuilt PCM was good to begin with. If he can prove that, then you will start checking all of the wiring in your van.
The pcm guy tells me when they flash the units they do it on the dodge website and that it also tests the unit. He told me to bring it back for a test. Can't get it back to them till next thursday. If anyone has any more input before I take it back, I'm all ears
Find out where your shop got the PCM, if it came from NAPA which is the only local parts store that can supply one here where I live, thats probably your problem. As I stated above whoever supplies NAPA with their PCMS simply spray paints them and calls them remanufactured, I know I went through three of them.
Thanks for all the good input. I didnt make it to exchange the ECU this thursday so i have taken this weekend to try to inspect all my wiring and conectors and havent really found anything i would consider an issue. the next step would be hooking up a diagnostic tool that can monitor all the components individually (rather than checking every solinoid and relay seperately but I dont have one. a mechanic will want an arm and leg to do this im sure. can anyone recommend an OBD scanner for the laptop that works with dodge
Just a quick update, I was finally able to exchange my PCM and get another however I got the P0601 code immediately, I exchanged it again, and really ticked off the owner of the shop, they do not buy PCM's, they do their own work there and flash them while you wait. He was not going to warranty the unit because he said my vehicle was causing the problem. I told him everything that I had been through and all the mechanics and forums and anyone else with an opinion say its the computer. I told him if he could tell me somewhere or something specific to check I would do so, he had no suggestions. He warrantied the unit, but told me he would not honor another exchange. The unit he gave me looks physically different, I assume it is an upgraded unit, he told me it is the same just looks different. I have not installed it yet, I am worried about it frying and then I am just stuck where I started and will be out another $500.00 to start over. The Van has been driving without issue but I need to get past this. One question I was asked when they were reflashing was "does you vehicle have a factory installed securtiy system" and I said no because I was told it didnt when I bought it from the previous owner. Today I pulled the dog house to do some inspecting and saw a Remote Entry Receiver (P/N P5604519AB), I never got a remote and I had my own alarm installed, would this receiver mean that the van possibly has a security system installed and I just dont know? could this cause a P0601 code? Is there a test device that could hook up to my PCM plugs and test the wiring on my van for shorts or opens or is there a way to see what command my PCM is failing to do after 6 tries?
If you're being handed a used PCM then there's always a chance there's a problem with it. If they're reflashing the PCM and then selling them, then they could be flashing them incorrectly. If there's a warranty then he's legally obligated to replace the PCM for you. I would call him and discuss the alarm issue before you connect the PCM. There could be a different set of flashing parameters required.
Just wanted to update this post because I find myself looking through so many posts only to find that they end in a dead end. I assume that is because the person found the fix.
I put off installing the new PCM in fear that something else was causing the PCM to short out and the place that I purchased the PCM was going to refuse any additional warranties. I checked the wiring to the best of my abilities and found nothing wrong or shorted. Recently the van started dying after start and some days it would not start at all. I finally noticed a "NoBus" message in the odometer. This message opened up a whole new world of information in the forum and combined with the PCM issue I started checking the 5 volt circuit that goes to the many sensors (IAC, MAF, Crank and Cam sensor, etc.) all the circuts seem to be getting the correct voltage, so I starte checking the actual sensors themselves. I found a post about a dirty Crank sensor, I pulled it and it had many metal shavings on it (it is magnetic), I cleaned it. Installed the new PCM and everything worked fine, so that may have been the issue all along. Since then just to make sure I had done all I could I pulled the IAC, and it seemed to be stuck even after cleaning, so I have now replaced it also. In the mean time I replaced the aluminum contact rotor and cap with a brass/copper unit, I also pulled the MAF sensor and cleaned it. I drove the van for about a week to work and back putting a few hundred miles on it and never saw a CEL, so that is a relief. I hope this helps.