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2004 Buick Rendezvous Question: My car shifts good from first too second than prematurely shifts too third.

 

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Tinatempleton, 3.4L V6, Wilson, KS, July 21, 2013, 16:37
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When hooked up to a diagnostic tester it says these codes. PO 128, 442, 455 ( 3 codes).

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    Real Auto Haus (111 Answers) , Westmont, IL - (630) 361-6756
    TristanReal July 23, 2013, 13:24
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     Journeyman

    P0128 Is a coolant temp code probable thermostat and coolant sensor problem this may cause some issues if vehicle is not going into closed loop. and 442 and 445 is emission code which has no relation to your symptom. Have transmission checked as well. Have transmission checked as well.

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