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Thread: 2003 Ram 1500 5.7 Hemi PCM upgrade

  1. #1
    Potential Tuner
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    Dec 2021
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    2003 Ram 1500 5.7 Hemi PCM upgrade

    Hi all I have a 2003 Ram 1500 5.7 and it does not seem to be supported though its an NGC3. What is the best (mostly) plug and play upgrade i can install?
    Thanks in advance!

  2. #2
    Potential Tuner
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    Dec 2021
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    2003 Ram 1500 5.7 read error.PNG

    Maybe I wrongfully assumed my ECU was incompatible due to this error when trying to read it. It also says something about unknown modules being present.

    Any help would be appreciated.

    Thanks

  3. #3
    Advanced Tuner rays04gtx's Avatar
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    Oct 2021
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    I know this is old, but if anyone comes here looking for Infomartion, the best option is to upgrade the ECU to the 04-05 Ram ECU , 05 is a better option, but 04 will work fine and is mostly plug and play while 05 there is a more wiring to deal with.

    on Hemi truck Club , .com there is a great write up about switching the 03 over to 05.

    Swapping 06-08 ECu in to the 03 is more involved , but you do have better tunability over the P.O.S REF545.

    Ultimite is a ECU from a 6 speed 2013/2014 , those are a complete P.I.A to swap over to, it can be done, it's been done, with this swap, you should swap over the Whole dash.....it'll fit and honestly I think it looks better.
    62 Biscayne 425/409 SS/D stock class car 10.60s
    66 Dart 426CIG3 8.60@171 2750lbs Naturally asperated
    04 Ram All Alum , 468Ci G3 10.50s @4800 lbs Naturally asperated
    04 Rumble Bee, built 6.1 ,4000lbs 10.48 @ 129s MPH. Naturally asperated
    05 Rumble Stock 5.7, 3.92s TUNE ONLY 13.94@98mph