Transmission not shifting properly

TYSHAN

MEMBER
2005 KIA SPECTRA
2.0L
4 CYL
2WD
AUTOMATIC
167,000 MILES

Driving on interstate on cruise control. Transmission jerked into third gear. Exit interstate. Upon reacceleration, the car did not shift as normal. Fluid good. Transmission was able to engage into reverse and park with no issue. Worked 10 hours, commuted home (approximately 50 miles) - no issue. Parked car. Commute to work the next day. No cruise control enabled. Issue presented itself after approx 20 miles of travel.
codes: P0721, P0501, P0507, P0700.
Help!

3 Replies

KASEKENNY

MECHANIC
18,907 POSTS

Basically the p0700 is just telling you that there are other issues related to the transmission so I would suggest starting with the vehicle speed sensor issue.

I attached the info for the wheel speed sensor and the throttle position sensor in addition to the vehicle speed sensor info.

If the vehicle speed sensor is faulty then the shift pattern will be incorrect so let's run through this material and see what turns up. Thanks

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Thursday, April 15th, 2021 AT 6:27 PM

TYSHAN

MEMBER
2 POSTS

Thank you.
I recently had wheel bearings (press in) installed.
Would this be a cause to my effect?
Since the first question, I have operated the car under 75 MPH and this issue has not presented itself.

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Friday, April 16th, 2021 AT 9:35 AM

KASEKENNY

MECHANIC
18,907 POSTS

That could be the cause of the wheel speed sensor code but I suspect you have two issues.

The wheel speed sensor does not affect shifting but the vehicle speed sensor does.

The way this works is each wheel has a speed sensor and that is feed to the ABS for traction control and other systems.

However, the PCM uses a vehicle speed sensor which is a single sensor that tells the PCM what the output shaft speed is which is calculates what the vehicle speed is from that and helps with shift patterns.

It is interesting that it has not happened under that speed. Just for testing purposes, drive over that and see if it acts up. It may be a coincidence.

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Saturday, April 17th, 2021 AT 9:09 AM