Thread: No codes, slipping and banging

Originally Posted by BillBoost37

Awesome.. finally popped a code for you.

P1811, if you search google or here, you'll find this to be super common to the transmission. The typical issue there is a soleniod commonly referred to as one of two names. EPC - Electronic Pressure Control or PCS - Pressure Control Soleniod. It's job is to control pressure and commonly a shift kit can help with the issue as you'll find when you search. It's a bandaid that is relatively cheap and easy to install. It may help, it may fix the issue..it may not.

Here's a link of a sponsored vendor that explains it well. Harsh Shift, P1811


The accumulator is where the shift kit is installed.

I cannot thank u enough for all your help! I jus remembered the guy had also told me the scanner runs the solenoids as well and he said mine are all checking out fine, could that still be an issue? I had seen the page for the shift kit, and have read quite a bit about it, but im just double checking, I guess. Im so relieved it did throw a code. I had asked the mechanic why it only does it sometimes, their answer, idk of course. Yesterday I left from my house, was not warmed up, ran fine, after about 10 minutes it started getting really rough, then about 10 minutes later it then ran fine all the wayto the shop and all the way home, never shuting the car off. Really puzzles me. Also, if I have worn clutches, wouldnt I have at least some shavings in my fluid?