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Po751 on chevy suburban - 1500 Chevrolet Cars & Trucks

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DTC P0751 - 1-2 Shift Valve Performance code.
You could possibly have a valve stuck in the valve body or an internal problem.

Try this...
1. Clear the code and then monitor scanner data for shift solenoids and verify the command for all 4 gears takes place.
2. If command is OK, then remove the pan and the two solenoids and air check the solenoids while turning them off and on to make sure they are hydraulically functioning.
3. If the solenoids are OK then there is an internal failure inside the transmission.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Posted on Feb 14, 2012

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Hi Phillip:
DTC P0751 - 1-2 Shift Valve Performance code. You could possibly have a valve stuck in the valve body or an internal problem.

Try this...
1. Clear the code and then monitor scanner data for shift solenoids and verify the command for all 4 gears takes place.
2. If command is OK, then remove the pan and the two solenoids and air check the solenoids while turning them off and on to make sure they are hydraulically functioning.
3. If the solenoids are OK then there is an internal failure inside the transmission.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

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