Transmission not shifting properly

DCLS3755

MEMBER
2011 CHEVROLET HHR
2.2L
4 CYL
2WD
AUTOMATIC
127,000 MILES

Transmission shifts hard and won't shift down until I stop sometimes it shifts perfectly. Could this be an input speed sensor?

Thursday, June 9th, 2022 AT 9:21 AM

1 Reply

KASEKENNY

MECHANIC
18,907 POSTS

Yes. This could be a sensor issue, so we need to start at the beginning to find out for sure.

This means we need to start with checking the fluid and make sure it is the proper level and what it looks like. Is it dark and smell burnt?

https://www.2carpros.com/articles/how-to-check-and-add-transmission-fluid

Next, we need to check for any codes and find out if we have any codes pointing to a sensor issue.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

If we have no codes and the fluid is filled and in good condition, then we will have to monitor the input and output speed sensor info with a scan tool to find out if they are not reading correctly. However, if they are not then this vehicle would set a code because the speed sensors are monitored based on output and if they are not reading what they should then it will set rationality codes.

So, let's start with this info and go from there.

Thanks