PO770 error code

[Dave]

Anyone been through this one before? 2002 Tacoma 3.4l auto transmission. PO770 is shift solenoid E malfunction, which apparently controls the torque converter lockup. Drove fine all the way to work today, both at highway speeds and stop-go city driving.

The most pessimistic results I got from the Google search says usually the solenoid itself is not the problem, but the problem is more likely due to metal particles in the fluid from failing parts clogging the solenoid (!!!) and the entire transmission needs to be replaced. The truck was in the shop in July for a transmission flush.

The most optimistic results from TTORA was that they drove for months with the code and never had a problem.

God bless the Internet and her bipolar tendencies.

 

[viter]

perhaps an easy thing to check would be the solenoid wires - as far as the solenoid receiving good power from the battery. Once I had a bunch of various sensor malfunction codes show up all at once just because my grounding cable from the battery to truck chassis was getting loose. I know that the chances of this being the problem are slim, but nevertheless if it is easy to check I'll do that first. Also, perhaps you should talk to the people who did the flush since it seems to happened right after it... just my 2 cents...

 

[toyotechwv]

There is a TSB for this. #EG025-02 includes an ECM recalibration which is covered for 8 years or 80,000 miles and a valve body replacement which is covered under the powertrain warranty.

 

[Dave]

Also, perhaps you should talk to the people who did the flush since it seems to happened right after it... just my 2 cents...

Yep, dropped it off with the dealership that did the flush this morning. Still waiting to hear back.

There is a TSB for this. #EG025-02 includes an ECM recalibration which is covered for 8 years or 80,000 miles and a valve body replacement which is covered under the powertrain warranty.

I hope that's all it is. Do you know if there are any other symptoms related to the TSB? Like I said, I didn't notice any thing wrong with it other then the CE light.

Thanks!

 

[Dave]

They cited the TSB and went ahead with the ECM recalibration. They said the diagnosis outcome did not call for the valve body replacement. Apparently it has something to do with ambient air temperature?