2003 CTS Gas Gauge reads 3/4 full with a full tank
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  • 1 Post By Kingoftypos
Cadillac CTS First Generation Forum - 2003 - 2007 Discussion, 2003 CTS Gas Gauge reads 3/4 full with a full tank in Cadillac CTS Coupe, Sport Sedan and Sport Wagon Forums; I changed the fuel pump by cutting access panel under rear seat on passenger side, and now the gas gauge ...
  1. #1
    cando66 is offline Cadillac Owners Member
    Automobile(s): 2003 CTS
    Join Date
    Jul 2013
    Age
    58
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    2003 CTS Gas Gauge reads 3/4 full with a full tank

    I changed the fuel pump by cutting access panel under rear seat on passenger side, and now the gas gauge reads 3/4 when I know its filled to the top...I have seen many complain about this however I know of no solutions...anyone know how to fix this?
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  3. #2
    Kingoftypos is online now Cadillac Owners Master
    Automobile(s): 06 CTS Sport/Luxury package
    Join Date
    Apr 2009
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    Ledyard, CT
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    There was a recall issued on the earlier CTS for the gas gauge. I am wondering if the new fuel pump has an updated gauge. And now you'll need to re-flash the computer.

    Lets say the original pump would show 1,000ohm when full. But the computer was programmed for 750ohm for full. Then came the recall re-flash. So now the computer sees the 1,000ohm as full.

    Now 10 years later you change the pump, now it's sending 750ohm as full and your computer is set for 1,000ohm as full.

    That's my theory anyways.

    KOT
    cando66 likes this.

  4. #3
    cando66 is offline Cadillac Owners Member
    Automobile(s): 2003 CTS
    Join Date
    Jul 2013
    Age
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    Re: 2003 CTS Gas Gauge reads 3/4 full with a full tank

    if their were a recall how do I find out if my CTS was one of the recalled cars, and if so will they fix it? I will try to find out what the ohms should be and adjust it on the new one so it matches the old.... Re-Flash would be easier however how much would that cost...

  5. #4
    Kingoftypos is online now Cadillac Owners Master
    Automobile(s): 06 CTS Sport/Luxury package
    Join Date
    Apr 2009
    Location
    Ledyard, CT
    Age
    35
    Posts
    7,552
    All 2003's were affected with the recall. But I honestly don't know if that is the issue. It was just a thought.

    KOT

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