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What does codes P0051 and P1684 mean on my 2001 pt cruiser

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O2 sensor (found just in front of the cat) or Power steering pressure sensor fault if it's a typo and should be P0551.
Ignore P1684 as it just means sometime in the last 50 starts the battery was disconnected

Posted on Apr 17, 2017

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SOURCE: Engine light codes P0551 and P1684

CODE PO551 -POWER STEERING PRESSURE SWITCH CIRCUIT FAILURE. CODE P1684 - BATTERY HAS BEEN DISCONNECTED.

Posted on Aug 23, 2009

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1 Answer

What does code P1684 for Chrysler pt cruiser mean?


P1684 means battery disconnected within the last fifty starts

Apr 11, 2015 | Chrysler Cars & Trucks

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What do the codes P1684 and P0700 mean?


Hi Rich Stuck,P0700 means Transmission Control System (MIL Request),P1684 means Battery Disconnected within last 50 starts.More read Diagnostic Trouble Code Table ,hope it can help you.

Dec 08, 2012 | 2002 Chrysler PT Cruiser

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We change the computer in our 2002 and there are 2 codes showing on the screen. P1684 & P1685


Code 1684 says the computer has lost battery voltage in the last 50 starts, and code 1685 means the security code in the key is not valid.
You may have to have the computer flashed by the dealer to match the original settings in the original computer.

Aug 17, 2012 | 2002 Chrysler PT Cruiser

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Got codes P0401---EGR Valve. P1684---have found two different meanings for this code. One says a readiness test. Not all readiness tests have been performed. This means that at least one of the many...


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  • Use a vacuum pump and pull the EGR valve open while monitoring engine RPM's & DPFE voltage. There should be a noticable difference in RPM's with the EGR open
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  • Aug 10, 2011 | 2001 Chrysler PT Cruiser

    3 Answers

    Errors P1684 given, how do I fix


    The first code, p1684, just states the battery has been dis-connected in the last 50 start cycles.
    Code p0401 is the EGR flow. You may need to replace the EGR valve.
    Code p1193 is the intake air temperauture ( IAT) sensor. It may also need to be replaced.
    Have your mechanic take a look at those, and please let me know how it goes.

    Feb 11, 2010 | 2001 Chrysler PT Cruiser

    2 Answers

    Engine light codes P0551 and P1684


    CODE PO551 -POWER STEERING PRESSURE SWITCH CIRCUIT FAILURE. CODE P1684 - BATTERY HAS BEEN DISCONNECTED.

    Aug 23, 2009 | 2001 Chrysler PT Cruiser

    1 Answer

    WILL A Dnr code stop a car from firing


    Considering that all of the codes you mentioned had something to do with electrical signals from the various sensors, my bet is on wet connections. Try taking a blow dryer set on low heat to the wiring connectors.

    Mar 15, 2009 | 2001 Chrysler PT Cruiser

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