what does fault code P1684 mean?



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Thread: what does fault code P1684 mean?

  1. #1
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    what does fault code P1684 mean?

    just a quick question, on my2002 grand caravan, what does fault code P1684 mean? Would this result in rough shifting? Thanks!

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  3. #2
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    Here is the Definition of your Diagnostic Trouble Code (DTC)
    MakeDodgeYear2002ModelCaravanEngine3.3Vehicle SystemTRANSMISSIONDiagnostic Trouble Code ( P1684) DTC Definition:
    Battery Power To Module Disconnected


    This is what the actron reader site says. You need to check your electrical wiring harness to the tranny. Could be loose or coroded or bad ground.
    2000 Caravan 3 L. 17-20 MPG. 134,000 klm. New tranny at 97 K. 143,800 KM. replaced tensioner pulley, serpentine belt, and power steering pulley, brake light switch.
    Old reliable - 1982 Dodge Ram Long Box 318 Auto 3 speed transmission 66 K.

  4. #3
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    If you disconnected your battery you will get a P1684 code for the next 50 restarts, if you bother to check the readouts. That's the most common source of P1684. It means that there has been a power interruption to the TCM (transmission control module) as dun4now has pointed out in Post #2.

    With my 2002, I will get a check engine light a couple times a year (for the past 3 years) and the codes will be P0456 (small evaporative leak) and P1684. However, that has to be a glitch as the battery wasn't disconnected. So, I disconnect the negative battery terminal and clear the P0456 code. After 50 resarts, the P1684 code disappears as well. That problem usually happens this time of year only. I have also had a similar experience with the Jeep. Go figure.

    What is your situation as to the P1684 code showing up? It shouldn't cause a check engine light on its own.
    2007 GC SXT - Magnesium - S&G - 3.8L - 173,000 kms
    2002 GC Sport - Stone White - 3.3L - 358,500 kms
    2003 Jeep TJ Sport - 4.0L - 279,000 kms

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  6. #4
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    Quote Originally Posted by Jeepman View Post
    If you disconnected your battery you will get a P1684 code for the next 50 restarts, if you bother to check the readouts. That's the most common source of P1684. It means that there has been a power interruption to the TCM (transmission control module) as dun4now has pointed out in Post #2.

    With my 2002, I will get a check engine light a couple times a year (for the past 3 years) and the codes will be P0456 (small evaporative leak) and P1684. However, that has to be a glitch as the battery wasn't disconnected. So, I disconnect the negative battery terminal and clear the P0456 code. After 50 resarts, the P1684 code disappears as well. That problem usually happens this time of year only. I have also had a similar experience with the Jeep. Go figure.

    What is your situation as to the P1684 code showing up? It shouldn't cause a check engine light on its own.
    Not to steal the thread but I have done battery disconects in the past and no codes show up on mine. (scratching my head).
    2000 Caravan 3 L. 17-20 MPG. 134,000 klm. New tranny at 97 K. 143,800 KM. replaced tensioner pulley, serpentine belt, and power steering pulley, brake light switch.
    Old reliable - 1982 Dodge Ram Long Box 318 Auto 3 speed transmission 66 K.

  7. #5
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    Quote Originally Posted by dun4now View Post
    Not to steal the thread but I have done battery disconects in the past and no codes show up on mine. (scratching my head).
    Did you actually check for codes? The check engine light does't come on for a P1684 code, otherwise it would continually annoy you for the next 50 restarts..
    Perhaps the 3rd Generations are different .... don't know.
    2007 GC SXT - Magnesium - S&G - 3.8L - 173,000 kms
    2002 GC Sport - Stone White - 3.3L - 358,500 kms
    2003 Jeep TJ Sport - 4.0L - 279,000 kms

  8. #6
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    Quote Originally Posted by Jeepman View Post
    Did you actually check for codes? The check engine light does't come on for a P1684 code, otherwise it would continually annoy you for the next 50 restarts..
    Perhaps the 3rd Generations are different .... don't know.
    That's what I was saying, after a disconnect I check for codes with the trip button and it does the tests but comes back clean. It doesn't tell me I had the disconnect, that's what I meant.
    2000 Caravan 3 L. 17-20 MPG. 134,000 klm. New tranny at 97 K. 143,800 KM. replaced tensioner pulley, serpentine belt, and power steering pulley, brake light switch.
    Old reliable - 1982 Dodge Ram Long Box 318 Auto 3 speed transmission 66 K.

  9. #7
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    Quote Originally Posted by dun4now View Post
    That's what I was saying, after a disconnect I check for codes with the trip button and it does the tests but comes back clean. It doesn't tell me I had the disconnect, that's what I meant.
    Any time I disconnect the battery and then check for codes, I will get P1684 showing up. Your 3rd Generation Van is hiding information from you.
    2007 GC SXT - Magnesium - S&G - 3.8L - 173,000 kms
    2002 GC Sport - Stone White - 3.3L - 358,500 kms
    2003 Jeep TJ Sport - 4.0L - 279,000 kms

  10. #8
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    Some info I had on file (that might help):

    02rget 124.pdf

    02rget 123.pdf

    02rget 125.pdf

    Bottom line- be sure your battery is good (like perfect - 13.0 VDC), check that your grounds are tight/clean, and clear the code with an OBDII scanner.
    Last edited by domac80; 09-01-2011 at 01:04 AM.

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    I believe that this is a software bug which will not be fixed by Chrysler/Fiat. I had an 0456 code ie EVAP small leak. Had dealership fix the 5 dollar hose and 100 service charge. The 1684 battery code is now gone.

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    P1684 fault code solved

    I had the P1684 code on my 2003 Town and Country van but had no obvious reasons for the code until the transmission started upshifting for no reason. After long observation of the problem, I determined that the issue was with the throttle position sensor. Replaced the sensor and the code went away. Transmission shifting returned to smooth shifts. Increased power on gentle acceleration.

    Observed symptoms were: upshifting on level and slight inclines with cruise control active (speed did not change), sometimes had slightly rough idle with tendency to stall with gentle take offs until the engine was at operating temperature, occasional hard shifting from 1st to second gear, Codes P1684 and P1699 (intermittently) displayed.

    P1684 appears to be a best guess by the computer to a failing throttle position sensor. The sensor is checked at startup, but it seems there is no code for a failing or noisy sensor during vehicle operation. Before going through a time consuming and costly repair process, I recommend replacing this $27.00 part first. I did not disconnect the battery as I wanted to see if the code would clear on its own after the part replacement (which it did after driving the appropriate amount of time).

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