Hello all this is my dirst post on the forum looks like a great place for info being i have been out of the GM loop for years while i worked for Ford. well i bought my first Bonnie i have owned pontiac'* and chevy'* before but never a from wheel drive. OK with that said i test drove this car has all gears trans fluid looks clean. it needs a passenger side front bearing but i also noticed that one side had a 225/60/16 the driver side has a 215/60/16 which is about 1.77% difference could that possibliy be setting the code? i know in some ford speed sensing is done at the hubs is it possible it could be the hub or the tire size difference? thanks in advance for any help im in North East PA any memebers out here?

Hello and Great to have you here!!!


DTC Code: P1870 = Trans component slipping

From a Tech II article on this code:

I'm sure other members will chime in to help out better than me.

-Todd.

im hoping this is the issue because i really didnt notice any thing shifting hard or anything or a leak for that matter. keep the ideas coming thanks guys.

[IMG]file:///C:/Users/Bill/AppData/Local/Temp/moz-screenshot.jpg[/IMG][IMG]file:///C:/Users/Bill/AppData/Local/Temp/moz-screenshot-1.jpg[/IMG]CIRCUIT DESCRIPTION

The Powertrain Control Module (PCM) monitors the Torque Converter Clutch (TCC) slip by calculating the difference between the engine speed and the transmission output shaft speed. When the PCM detects an excessive amount of slip when the TCC is engaged, then DTC P1870 sets. DTC P1870 is a type A DTC.

DIAGNOSTIC AIDS

• Ensure that the vehicle'* final drive ratio matches the PCM'* calibration.
• Ensure that the transmission will shift through all four gears with the gear select lever in the D4 range.

so im am correct to think that the tire size differnce from side to side can be an issue with GM as well.

You can't have 2 different sized tires from side to side. This causes the diff to spin and can cause problems.

perfect because that is what i thought might be going on i no these newer cars are sensitive to that stuff wasnt sure the GM was or wasnt lucky i am not driving the car yet so it wont be a problem for long because im gonna change the tires as soon as it gets here. i will keep you guys posted on what happens. AGAIN 1 MILLION THANKS TO ALL OF YOU FOR THE INFO.