Cruise Control Inhibited

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

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

The ECM has not detected a brake pedal activation from the body control module (BCM).
A Cruise Control System DTC has been set.
The vehicle speed is less than 40.2 km/h (25 mph).
The vehicle speed is too high.
The vehicle is in PARK, REVERSE, NEUTRAL, or 1st gear.
The engine RPM is too low.
The engine RPM is too high.
The system voltage is not between 9-16 volts.
The Antilock Brake System (ABS)/Traction Control System (TCS) is active for more than 2 seconds.