2000 Sonata drops to third gear and stays there until I restart the engine.

Thread view:

Enable EMail Alerts

Start New Thread

Thread rating:

jefferypuffenbarger@gmail.com - 21 Dec 2006 12:56 GMT

I've been having this trouble for some time now. I could be driving at
any speed when the transmission will drop down a gear and stay there.
If I restart the engine the tranny will shift properly until this
problem reoccurs. I have codes too. P1529, I have no idea what that one
is, I was told it is a manufacturer specific code. P0720 "The PCM has
determined that a malfunction exists in the electrical circuit for the
output speed sensor" . P0715 "The PCM has determined that a malfunction
exists in the input circuit for the turbine speed sensor." Please help
this is driving me insane.

Reply to this Message

Matt Whiting - 21 Dec 2006 18:59 GMT

> I've been having this trouble for some time now. I could be driving at
> any speed when the transmission will drop down a gear and stay there.
[quoted text clipped - 5 lines]
> exists in the input circuit for the turbine speed sensor." Please help
> this is driving me insane.

Sounds like you have a problem with a speed sensor and this is confusing
your transmissions control computer. Take it to a competent garage and
get it fixed.

Matt

Reply to this Message

hyundaitech - 22 Dec 2006 19:53 GMT

P1529 is simply an indicator that the transmission computer requested the
check engine lamp. Your descriptions for P0715 and P0720 are correct.

In nearly every instance when I've seen P0715 or P0720, the problem has
been with the sensor. I'd recommend replacing both the input speed sensor
and the output speed sensor. Chances are this will take care of the entire
problem.

Reply to this Message