Copy and pasted from one of the forums. That P0785 might part of the CC system, I'd
think. I've had stored CEL codes disable my own TB CC. Clear the code up, CC works
again.
The PCM inhibits the cruise control operation when any of the following conditions exist:
* The PCM detects that the center high mounted stop lamp (CHMSL) is not operating
properly.
* A Cruise Control System related DTC has been set.
* The vehicle speed is less than 40 km/h (25 mph).
* The vehicle is in PARK, REVERSE, NEUTRAL, or 1st gear.
* The engine RPM low.
* The engine RPM is high.
* The vehicle speed is to high.
* The system voltage is not between 6 volts and 16 volts.
* The antilock brake system/traction control system is active for more than 2 seconds.