Cruise Control Inhibited

WARNING: This page is about a different car, the 2005 GMC Canyon and 2005 Chevrolet Colorado. However, it is still accessible from the selected car via links, so may be relevant.

The powertrain control module (PCM) inhibits the cruise control operation when any of the following conditions exist:

A cruise control related DTC has been set.
The vehicle speed is less than 40.2 km/h (25 mph).
The vehicle is in PARK, REVERSE, NEUTRAL, or 1st gear.
The engine RPM is too low.
The engine RPM is too high, with fuel cut off.
The vehicle speed is too high, with fuel cut off.
The system voltage is not between 9 volts and 16 volts.
The Traction Control System (TCS) is active for more than 2 seconds.