Question about 1998 Jeep Cherokee

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THE MECH PUT ON TWO ANALYZERS. ONCE SAID THE TRANSMISSION WAS FUNCTIONING. THE OTHER SAID IT COULD NOT COMMUNICATE WITH THE COMPUTER. THE PART THAT HE SAID IT NEEDED WAS P56041386AA. WHEN YOU ENGAGE THE TRANS MISSION, IT TAKES OFF VERY SLOWLY. BUT IF YOU PUT IT INTO 1ST GEAR AND SHIFT LIKE A MANUAL TRANS MISSION IS SHIFTS JUST FINE. THE VIN # IS 1J4FT68S8WL118972. HE SAID IT WAS THE AISAN TRANS?? HE WILL NOT RETURN MY PHONE CALLS TO SEE IF HE ORDERED THE PART OR ANY MORE INFORMATION. MY PLATES HAVE EXPIRED SO I AM SITTING HOME. PEP BOY'S ABOUT 1 MILE AWAY, ARE THEY EQUIPED TO HANDLE THE JOB. MY E-MAIL ADDRESS IS GGBRINK@JUNO.COM. THANKS

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  • ggbrink Jun 29, 2009

    YES. I APPRECIATE THE FAST RESPONSE. WILL CONTINUE TO USE THIS SOURCE FOR FUTHER NEEDS. DO YOU HAVE A NEWS LETTER THAT YOU CAN SEND OUT ON E-MAIL SITES. THANKS AGAIN.

    GLADE

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  • Jeep Master
  • 2,200 Answers

Hi
Your mechanic has hooked your jeep to to a diagnostic reader and analyzed the fault codes.

What the mechanic is referring to by that part no P56041386AA is the transmission computer. This is a little electrical box that monitors the automatic functions in the transmission. If it becomes faulty the autobox will not function.

Any competent mechanic will be able to repair this for you.



Posted on Jun 29, 2009

  • Radio Code Pro
    Radio Code Pro Jun 29, 2009

    I am including this link so you can see exactly where the transmission computer is located on your vehicle. The transmission computer (also called Transmission Control Module or TCM) is at number 7 in the diagram



    See this diagram http://www.wjjeeps.com/ecm_02.jpg





    The Transmission Control Module controls all electronic operations of the transmission. The TCM selects the operational mode of the transmission and determines the appropriate shift schedule and shift points, depending on the present operating conditions and driver demand.



    This unit can be expensive to buy new and it may be worth considering getting a reconditioned unit (recon prices are $300 - $400) or maybe try a second hand one from a junkyard. It will not cost that much to install a new one but it may have to be reprogrammed into your vehicle and the mechanic will need to connect aa analyzer to your vehicle to do this.



    My advise is to ring Pep Boy's and ask them if they have the equipment to program this unit in your vehicle if you get it for them. You can then make some investigations and purchase the unit yourself recon or secondhand. Bring it to them and have it fitted. When ordering the unit serial no is 56041386AA (do not include the P at the front).



    Hope this helps. Do not forget to click through and rate my answer.



    Thank You

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