Driving my 1997 XJ6 w/ 134k miles on the highway and every single dash warning light came on and car started to stall. Was able to limp home but problem still persists. I'm getting error code P1775 and P0400 but they don't seem related. Would this be an ECM failure. I'm new to the XJ6 but not Jags. Any help is greatly appreciated.

Thanks,
Pat

 

dear god.

try removing your negative battery terminal for five minutes and see what happens.

if nothing improves, I'd say head to the dealer.

that's your XJ6's way of giving you the finger pro style.

 

In addition to the suggestion of "hard reboot" from panchostatus, I suggest you make sure your ECU is getting full voltage by checking the power studs in the firewall and at the front fuse terminals. Your battery is OK, right?

 

I've seen sickly batteries do incredibly strange things with these cars. wouldn't hurt to have it tested