Hi , i'm new to this forum. First post.
I have a 2006 Chevy Uplander 3.5 L. This code has come up in the past 3 years on a couple of occasions and then disappeared. Today, I had just booked in to get an E test and now this code came up. Can anyone tell me where exactly this sensor is located? Any good troubleshooting ideas? Any info. Would be appreciated. Thanks.

 

the sensor is in the left side of the transmission case. you might want to let a professional diagnose this.