[ImperialCrown]

Welcome to Allpar. Has it had any transaxle filter/fluid service in recent history? Dropping the pan to replace the filter and looking for trouble might be a good place to start. Use ATF+4 only.
The TCM may be storing a fault code that would be seoarate from the PCM.

 

[dbutler1961]

No recent service, has been about 13 k since the trans fluid was changed

 

[ImperialCrown]

Slipping is bad. Was the filter changed or was it a flush? Does the parts/service receipt happen to state that ATF+4 was used?

 

[dbutler1961]

it was just fluid and filter service and yes atf4 was used

 

[dbutler1961]

I checked fault codes and got P0700, P0732, P0733, P0734, P0736, P0846 and P0871. Any ideas?

 

[dbutler1961]

I cleared the codes and drove the car again and all came back. I had to stop and restart one time to get back home. The fact that I can turn it off and restart it and all the gears work leads me to believe it is something electrical also when I have to stop I can hear a light buzzing sound until I put it in park

 

[ImperialCrown]

Does the buzzing sound stay at a constant pitch, or does it rise and fall with engine speed?
Even without electrical you should still have 2nd gear and reverse, not neutral.

 

[dbutler1961]

buzzing stays the same

 

[browens1534]

Speed sensor? I know this is a more "up to date trans". Had issues with an A604 2 years ago doing almost the same exact thing, was a speed sensor.

 

[ImperialCrown]

Buzzing may be relay or solenoid noises. See if you can locate the source. It may be a connector or wiring issue. The EATX relay drives the solenoids and TCM.

 

[dbutler1961]

I pulled the pan tonight and everything was fairly clean. The magnet was a little fuzzy and there were a few shavings in the pan but not what i would think to be an excessive amount.

 

[dbutler1961]

I replaced the input speed sensor and that solved the problem.

 

[ImperialCrown]

Strange that the input speed sensor (P0715) wasn't one of your fault codes. Gear ratio error fault codes for 2nd (P0732) and reverse (P0736) could only be hydraulic or mechanical problems.