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2008 Chrysler 300 not running right

Discussion in 'New Challenger, 300, Magnum, Charger' started by Marty1965, Apr 4, 2020.

  1. Marty1965

    Marty1965 Active Member

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    My son has a 2008 300 with a 3.5l engine with over a 150K on it. He says it's not running right and in limp mode. We stuck my scan tool on it and do not see any codes. He said it could be one of three things: the switch or sensor on the accelerator pedal, the throttle body sensor, or what he is calling a Flashmaster engine computer located under the hood near the passenger side hood hinge (mounted to a cross member holding the dust shield for wipers). Can anyone give me direction? Thanks.
     
  2. moparroy

    moparroy Active Member

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    What are the symptoms? I would have thought to go into limp in mode it would have to have a stored code.
     
  3. AllanC

    AllanC Well-Known Member

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    If you could further define "limp mode" it would help greatly. Is the transmission only in 2nd gear and is not shifting? That would be transmission limp mode.

    If you press the accelerator pedal and engine rpm increases to a low limit like 1000 rpm then that is throttle control limp mode. If that is the issue then you would have a warning indicator as follows on the instrument panel.

    Electronic Throttle Control Warning.jpg

    Does the engine buck, jerk, lose power or seem anemic to response?
     
  4. valiant67

    valiant67 ...

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    Is the electronic throttle control warning light on? Is that how he came up with those possible issues?
    Is your scan tool sophisticated enough to read that type of error code?

    Throttle_Control_Bolt.jpg
     
  5. ImperialCrown

    ImperialCrown Moderator
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    A transmission (TCM) 2nd gear limp-in should set a fault code. Since TCM faults aren't necessarily 'OBDII' (emissions), some engine code readers won't read them. Some can only read PCM codes.
    I wouldn't replace anything until more diagnosis can be done. Try another scan tool? Is the 'ck eng' or ETC (throttle) light on?
    By 'not running right', do you mean that there is a misfire or hesitation or it stays in one gear? Need more info.
     
  6. Marty1965

    Marty1965 Active Member

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    Took a while to get back to all of you since he ended up replacing the PCM. That got rid of that lightning bolt throttle control warning light but he says he still has a misfire even though we replaced the plugs as well. He says it shifts fine. The oil light comes on and stays on until he shuts it off and turns it back on, though (oil has been changed and level fine). Thanks
     
  7. ImperialCrown

    ImperialCrown Moderator
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    Are there misfire codes? Is it for one particular cylinder (P030x), or multiple cylinders (P0300)?
    I would have it scanned for codes.
    The oil pressure light may have also stored a fault code. I would not drive it unless I knew why the light was on.
    There was an oil filter change in 2008. It is important to use the correct filter:
    Oil Filter Change For Some 2008 Vehicles – Chrysler Dodge Ram Jeep | FCA (at https://chrysler.oemdtc.com/165/oil-filter-change-for-some-2008-vehicles-chrysler-dodge-ram-jeep )
     
  8. chuzz

    chuzz Well-Known Member

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    I'd check the plugs for arcing and the connections inside the connections for corrosion if it was mine. Just a suggestion. I ain't a mechanic.
     

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