Codes P0700 and P07BF, where is the input/turbine shaft speed sensor located?

KEVIN SERRANO

MEMBER
2016 CHEVROLET IMPALA
2.4L
4 CYL
2WD
AUTOMATIC
150,000 MILES

I recently got the engine light come off in my car listed above. As usual, I ran the report to see what was wrong and it gave me two codes. P0700 and P07BF.

I took care of the first one which was replacing all 4 engine mounts.

I have yet to replace the input speed sensor. I don't know exactly where it is. I've checked online and some say is on the driver's side and some say is on the passenger side. Any help will be appreciated.

I'm also thinking of flushing the old trans fluid and changing the filter and see If that fixes my issues.

1 Reply

STEVE W.

MECHANIC
13,465 POSTS

The P0700 is a warning code, basically it is saying "Hey there is a problem in the transmission, I'm going to turn on the light so you can go talk to the transmission controller to get the real code".
The P07BF however is "Input Speed Sensor Circuit Low Voltage" and sets if the TCM sees lass than.25 volts for more than 4 seconds while the vehicle is in motion. It is supplied with 12 volts on one side and acts as a fast switch that sends voltage pulses to the TCM to tell it how fast the shaft is turning. To remove it you have to open the transmission and get to the valve body. Then you remove the valve body and disconnect the ISS and then you unbolt the ISS assembly and remove it. Reverse the process to install it and then you need to do the relearn.

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