Question about 2004 Cadillac Deville

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Continuation. Cadillac Deville 2004, 41k. Once engine warms up transmission shifting becomes "hard". Knocks when shifting from gear to gear. Only when engine is fully warmed up.

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  • yuliy971 Oct 14, 2010

    Good morning.

    I made diagnostic transmission, it showes codes: P0734, P0748, P01560.

    What is yours advice?

    Thank you.



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If the noise is only occurring when in 1st/2nd gears, then I would be leaning towards a chipped tooth in the tyranny. What you are hearing is the gears meshing with the space, creating a change in sound. This can be caused simply by not shifting properly once and grinding the gears or could simply be a weak gear and you managed to chip a tooth. If you are getting the sound in more than only 1st/2nd under hard acceleration, then I would be leaning more towards the transfer case. But then, could also be a sticky lifter or something else internal to the engine. Without hearing the noise, it is hard to say what it could be. Something even as simple as the knock sensor going out could cause something like this. But then, normally if the knock sensor is going, it will toss a code too.

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Posted on Oct 11, 2010


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