Seems my '99 with 157,000 miles is telling me it is tired. When I hit a hard bump in a construction site it goes into restricted performance mode and lights up the engine failure light. I pull to the side of the road and restart it 3 times and the code goes away and I drive on.
Seems to be a short or loose connection issue? any idea where to start? Bad module?
Any ideas?
Thanks!

 

have you been able to pull the code to see what may be triggering the RP?

 

I pulled the codes and I have the P0121 throttle/pedal position reading

In doing research seems I should clean and re-install the connector.

 

Hi Larueb,


I have a '99 XK8 that had a similar problem about 2 years ago. I was on my way back from Chicago to NH when I crossed a very rough Interstate/Bridge expansion joint that was less than level. The car went immediately to Safe Mode and I pulled over. Stopped and re-started. All was fine until I crossed the next rough Interstate/Bridge expansion joint. It appears Chicago has plenty of them. The same problem occurred, stop, start, reset, all set to go. Eventually, it got so bad I headed to Indianapolis and visited the dealer. Steven Perry is brilliant at the dealer in Indy. Turns out it was a mis-match between the metal in the throttle body connector. There is a Service Bullentin out on this problem. Evidently, gold is on one side of the connector and aluminum on the other. The repair took about 1 hour and everything has been fine since. I am wondering if this might be your problem.


Just an idea.