Hi guys First off I drive a 2005 Cobalt with a 2.2L.

My issues are these. Okay took my car on a road trip to California and after driving for 3 hours it was running fine. Cruise control was working then suddenly cruise control fails, Speedometer goes to 0 mph. Vehicle Keeps running but I notice that the shifts are kinda rough. I was forced to keep driving on because I chose to drive at night and when I arrived in San Francisco 9 hours later. I hooked up a computer to scan the car. Here are the codes I got:
P0722, P0700, P0171

I understand one is about the fuel being lean and the other 2 are with the Output speed sensor. Here is what I did. I replaced the Output sensor because it only cost $15. Wiggled around the wiring to see what could cause the issue with the car not getting signal from the Output speed sensor. I test drove the car and it still had the same issues with shifting and no speedo. I read on a other post somewhere that it possibly could be the connection. I wanted to come to the experts here to see what they think could be the issue.

I thank you in advance for looking at my thread and any input you guys may have.

 

P0171 Fuel Trim System Lean -PCM
P0700 Transmission Control Module (TCM) Requested MIL Illumination ECM
P0722 Output Speed Sensor Circuit Low Voltage TCM

Unfortunately wiggling the wiring isnt gonna be enough to diagnose the issue. You replaced the output sensor with a new ACDELCO part correct? You are going to have to get in there and measure for voltage at the connector with a multimeter with the key in the "on" position. I would also recommend checking for blown fuses FIRST before anything. I would go right to the cruise control fuse first and check that.

Also make sure you reset your computer since you replaced the part. Disconnect the battery and or pull the PCM/ECM and BACKUP labeled fuses under the hood for about 10-15 minutes.

 

yeah i put a new sensor from auto zone. What should the voltage be? computer has been reset also and it still didn't work.