Conditions for Running the DTC

WARNING: This page is about a different car, the 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.

The vehicle speed is 0 km/h (0 mph).
The engine speed is less than 40 RPM.
The engine coolant temperature (ECT) is 5-60° C (41-140° F).
The intake air temperature (IAT) is 5-143° C (41-289° F).
The ignition 1 voltage is more than 10 volts.
The accelerator pedal position (APP) is less than 15 percent.
DTC P1551 runs when the throttle actuator control motor is deactivated.