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What do these codes mean? are they somehow linked with eachother?

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Jeep Grand Cherokee 2001 P1787 and P1728? Power Steering Fluid? It's full could there be any other reason?

Vehicle: 2001 Jeep Grand Cherokee V6

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P1787 OD hydraulic pressure test failure

P1728 Hydraulic pressure test failure

These code condition are for the transmission. , what happens is the transmission did not produce the correct pressure, a good start is to check the transmission fluid level.

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