So the ZF 5HP19FLA in my Audi is having a problem keeping the torque converter in lockup at highway speeds when it encounters any kind of hill. It will accelerate normally for a few seconds, but will pop out of lockup when going up any hill and trying to maintain speed. The disengage is noticeable, unlike if it was operating correctly and it would be imperceptible. It will repeatedly do this for my 25 mile commute at every incline, and eventually it will set a hard CEL of P0741 which is TCC performance/stuck off. Then it will not attempt to go into lockup at all unless I rest the code. Rinse and repeat.
I've replace the torque converter because these ZFs are known for the internal seal being of poor quality and causing this problem. Nothing changed, so I then looked at the valve body being the issue. No go there, either.
Now I'm thinking that I'd like to drive it for another year and then part ways with it. Would increasing the operating viscosity significantly possibly improve its ability to hold the TC in lockup? Would adding some Type F in the mix help it to hold better? At this point, I'm shooting in the dark, and if either one would make no difference then I guess I'll just drive it as is and start looking for my next vehicle. Thanks.
I've replace the torque converter because these ZFs are known for the internal seal being of poor quality and causing this problem. Nothing changed, so I then looked at the valve body being the issue. No go there, either.
Now I'm thinking that I'd like to drive it for another year and then part ways with it. Would increasing the operating viscosity significantly possibly improve its ability to hold the TC in lockup? Would adding some Type F in the mix help it to hold better? At this point, I'm shooting in the dark, and if either one would make no difference then I guess I'll just drive it as is and start looking for my next vehicle. Thanks.