2009 Speedo died, rough shifting, CEL on, no cruise HELP

[2010AveoLT]

essentially, your Aveo is entering what is called "Limp Mode". in a nutshell, the Transmission Computer will either Delay shifting into or Completely Lock Out the Higher Gears as to prevent Expensive Physical Damage to the Transmission. (Chrysler was the very first automaker to equip an electronically controlled transmission with a "Limp Home" Mode.) the Vehicle Speed Sensor code also explains why your Speedometer had stopped working, as well as the Cruise Control. (both those systems depend on a working VSS to function properly) usually, a VSS pigtail has 3 wires: one is a 5 volt Reference signal generated by the PCM to power the sensor, one is a ground to the Vehicle Chassis, and one is the Output signal going back to the PCM where it is processed and then sent to the TCM (Transmission computer) and the IPC (Instrument Cluster for both the Speedo and the Cruise Control) over the GMLAN Data Bus (if so Equipped). (I hope my Explanation of how it all works helps out a little)

[Pickles]

Hey 2010lt, out of curiosity where did you learn all this stuff?

[2010AveoLT]

Hey 2010lt, out of curiosity where did you learn all this stuff?

I spent 2 years getting my Degree as a General Line Automotive Technician, and then a year and 3 months to get my Degree as a Collision Repair Technician; I HAVE to know these things if i'm going to make a living working on cars!

[2009-Red-P-O-S]

Great that makes a lot of sense and tells me what I need to replace but there are 3 or 4 items on the tranny that have wires comming out of them which one is the speed sensor and does this seem like the correct GM part # 96806579

[2010AveoLT]

Great that makes a lot of sense and tells me what I need to replace but there are 3 or 4 items on the tranny that have wires comming out of them which one is the speed sensor and does this seem like the correct GM part # 96806579

well, I can tell you right now the one of those items is going to be the Transmission Range sensor (its the piece that's right up front with the large pigtail coming out of it that's connected to the shifter Linkage) from my research, it looks like the VSS is on the right hand corner of the Final Drive near the firewall.

[JusteR]

Hehe, I can't work on that old stuff lol. Your courage is admirable... 200 bones? Sheesh, the common dodge ones were only 45 IIRC. Good luck and let us know how you made out. If it can wait a week until I get back in town, I can try and look yours up myself.

[2009-Red-P-O-S]

It has to wait M O N E Y

[r0n]

Hi, Did you find the fix? My dad is having the same problem.

Thanks in advance.

[JusteR]

2009 Red-- Thanks for the reminder... I didn't follow up on this one yet. Please let me know if this info is still needed
Juster-- The Krusty Mechanic

[r0n]

2009 Red-- Thanks for the reminder... I didn't follow up on this one yet. Please let me know if this info is still needed
Juster-- The Krusty Mechanic

Yes, please post fix when you get a chance.

Thanks Jester!