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    Major electrical problems in a 2009 Chrysler 300C

    Chrysler Chrysler Advice Chrysler 300C Chrysler 300C Advice Chrysler 300C 2009
    ...

    When driving, the speedometer of my 2009 Chrysler 300C diesel flicks up from its current speed to 160km/h. Also the rear clearance warning lights illuminate, the radio mutes and the airbag warning light illuminates. Seconds later all is normal again. Sometimes this happens two or three times a trip, sometimes it goes days without faulting.

    I took it to a Chrysler dealer who charged me a $600 diagnostic fee to tell me it was a TIPM unit. I had this replaced at $1400 and it made no difference to the fault. I took it back and they claimed it was a headlight leveling module and a replacement is unavailable. I live in Western Australia and these are not the most common car on the road.

    Answered by CarsGuide
    24 March 2025
    David Morley

    I kind of agree with the workshop you used that the problem was a prime candidate to be caused by the TIPM unit. This is basically a fuse-box, relay-box and electrical control unit rolled into one and, when it fails, it can often cause the problems you’re seeing all happening at once. This unit performs a very similar role to the body computer in other makes and models and it’s used to allow various functions of the car to talk to other components and functions.

    I understand that the new TIPM hasn’t fixed things, but faults with these units are not uncommon and it wouldn’t be the first time a brand new component has been faulty before it has even been fitted. A good check would be to try the TIPM from a car you know works properly and see if that fixes the issues. Certainly, the random and grouped nature of the faults points to the TIPM in a big way. If it really isn’t the TIPM at fault, I’d start looking for a bad earth somewhere on the car that is causing the mayhem.

    But try this test first. Disconnect the battery and leave it overnight. Next morning, reconnect the battery and see if the problem has gone away. It’s worth a try even though the fix may not last indefinitely, but it’s simple and free.

    Disclaimer: You acknowledge and agree that all answers are provided as a general guide only and should not be relied upon as bespoke advice. Carsguide is not liable for the accuracy of any information provided in the answers.
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