[mrgees100peas]

Car can go in reverse and forwards but won't go past 20mph. Engine revs fine. I keep getting p0777 code (Solenoid B Stucked ON) even after reset and test driving it. I changed transmission fluid. I checked the fuses and used contact spray on 2 cable connectors that go to the transmission. I took out the valve body and replaced 4 solenoids. I think they were the shift solenoids. I did not change anything else like the pressure sensor, stepper motor etc. Non of that helped. I just bought the whole valve body and I'm going to try that out. If that doesn't work then I don't know what else to do. Could it be the TCM but if it is I think that requires programing. Any advice is appreciated.

 

[aquanaut20]

Check the wiring for abuse..chafing.. Did you do any testing ?

Use a pro level scanner and bi directionally activate the solenoids.. Quit throwing parts before confirming fault.

 

[mrgees100peas]

Check the wiring for abuse..chafing.. Did you do any testing ?

Use a pro level scanner and bi directionally activate the solenoids.. Quit throwing parts before confirming fault.

What do you mean by bi directionally activate the solenoids?

 

[aquanaut20]

What do you mean by bi directionally activate the solenoids?

Use the scanner to activate the solenoids

 

[2013GV]

If its got a hard P0777 code (as in it resets but comes back first time the car is driven) its usually a mechanical issue in the valve body or a blocked fluid passage

Trying to exercise the solenoid with a scan tool may fix it, but I suspect it might be a bit more mechanical than electrical

 

[aquanaut20]

I agree, if it cannot be exercised with the scanner, I suspect a mechanical issue..

 

[mrgees100peas]

yeah, I'm biting more than I can chew on this one. I'll try the new valve body since I've already bought it and if that doesn't work then leave it to the professionals.

 

[2013GV]

You can't swap a valve body with the trans in place, theres check balls that will fall out if you try.

Just change out the solenoid and make sure the valve it actuates moves freely in the body.