P1515 BUICK, CADILLAC, CHEVROLET, GMC: CONTROL MODULE THROTTLE ACTUATOR POSITION PERFORMANCE
Description of DTC code P1515
The commanded throttle position is compared to the actual throttle position, which is based on information provided by the sensors that monitor that parameter, and other limiting factors.
Both the actual and expected position must be within a calibrated range of each other. Therefore, the PCM (Powertrain Control Module) continuously monitors this value to verify that the given requirements are met.
The P1515 OBDII fault code is a code that Buick, Cadillac, Chevrolet, and GMC manufacturers use to indicate that the PCM has encountered a throttle position performance problem. The reason is that the difference between the predicted and actual throttle position exceeds the calibrated amount.