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widowson2 2/5/2013

1999 Chevrolet Blazer LT 6 Cyl 4.3L

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 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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