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widowson2 2/5/2013
1999 Chevrolet Blazer LT 6Cyl4.3L - Transmissions & Drivetrains
check engine light on
scanner shows po751 and po756,Shift solenoid A and Bperformance problem or stuck in off position what needs to be done to repair this problem? any help welcome
1 Answer
  • Jimm
    Jimm 2/5/2013
    P0751 - Shift solenoid 'A' circuit performance or stuck open.
    The problem is with the 1-2 shift solenoid. Diagnostic trouble code (DTC) P0751 will disable shift adapts, force maximum line pressure, and inhibit 3-2 downshifts when the vehicle speed is greater than 30 mph.

    P0756 = Shift Solenoid B Performance or Stuck Off

    Possible causes; pertains to both P0751 and P0756 codes

    - Low transmission fluid level
    - Dirty transmission fluid
    - Faulty shift solenoid B valve
    - Shift solenoid B valve harness or connectors
    - Shift solenoid B valve circuit is open or shorted


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