Need help with codes P0727 & P1775- '96 X300

[FX300]

Hi all! New to the forum. Was on this forum for a brief time last year, but forgot my user name so started over. I have a '96 X300 VDP with AJ16. Love this car. No problems at all up to 66K, but my girlfriend was driving it last Friday night and she reported that it had died on her briefly while driving...and the inside lights flickered, but then it started right back up.
The check engine light came on. Today, both I and Autozone pulled the codes with an Actron CP1935 OBD II scanner, and it gave P0727 and P1775, which seem to be transmission codes. The last few days, I have been driving the car, and it has performed flawlessly, shifted smoothly, etc.

Any hints on what may be wrong here? Also noticed today that the passenger side rear speaker seems to be blown.

Phil- I drove down to your shop this afternoon on chance someone might be able to help diagnose this. Your guy said something about your computer being in Austin,( ???) and since the Astros are still playing, I needed the car for the next few days. I ended up going straight to Autozone, where they pulled the codes and I purchased a scanner . They read the codes and I confirmed them later at home.

Thanks for advance for any help anyone can provide. I'm a regular on the CJoffroad forum since I also have 2 older CJ7s. Of course, neither of those have ODB II and "designer" priced parts.

[FX300]

Ok, I partially found the answers for the check engine codes I found. The P0727 code is a signal sent indicating low engine speed. It gets sent just before the engine stalls. The P1775 is indicating a transmission MIL fault.

I suspect a glitch in the signal from the ECM caused this, but am still wondering if the P1775 indicates a problem, or just wait and see if it does it again. I cleared both signals.

[uncle]

I would not worry about any transmission problem. These codes occured because the engine stalled, not due to a transmission fault. Note the code went away.
Spark plug coils can be the source of this intermittent stall problem. Do you have any evidence of bad paint on your cam cover, black soot in the spark plug holes?
These coils can get a bit quirky and act up for a while before they fail hard.
I would not worry about the ECM at this point. Keep it simple.

[carter]

I had the exact same 2 codes come up on my 95 XJ6. The dealer thought they represented a torque converter control valve sticking. If it is the valve, the stalling should occur right when the car is put into gear. The valve is pretty accessable. You just take off the trans pan and valve body. I can descibe this more if the car died in a way that is consistent with this description.

[FX300]

Thanks for the replys. I'm trying to get more details from her on exactly how and when it stalled, but don't believe it was right after putting it into gear. Unfortunately, with some women, this question must be handled very delicately so as not to construe to her that she might have been doing something improper. The car has run fine for the last few days, as it always has before, so I don't think there is anything to be overly concerned with yet. There is no evidence of bad paint on the cam cover, although there is one place where the paint has bubbled up. Other than that, the engine is very clean. I did change the air filter, just in case, and found the existing one was only slightly dirty. I did this after reading other posts which discussed cleaning the throttle body. I guess, if you change air filters often, you shouldn't have to clean the throttle body very often. She's now reporting that it's running better than ever, however, I believe this is attributed to my driving it and leaving it in "sport" setting rather than "normal" setting. There is a big difference in perceived performance. Thanks for the help. I'll be sure and post again if needed.

[carter]

Yes, women can be more cantankerous than jaguars. Dealing with both can be total madness.