Originally Posted by clarka
OK so I disconnected the harness and the problem went away... but I don't have any bottom end power.
I'm fighting the same demon. ECM has put trans in limp mode.
After you clear the code 629 does it appear again during the KOEO test without driving or starting the vehicle?
if so (welcome to my world) check the purple/yellow (not purple/orange) wire for continuity from the c103 connector located below the brake master cylinder to the solenoid pack connector. Easier to access if you pull the seats and carpet and go through the hump cover in the floorboard. if test okay check from c103 to the ECM connector 60 pin rectangle shaped located driverside firewall. if test ok take out ECM and open it up looking for leaking capacitors on the PC board or corrosion on PC board. Post results.