DTC P1829: Throttle Position Signal (ECM): Description
WARNING: This page is about a different car, the 2013 Nissan Armada. However, it is still accessible from the selected car via links, so may be relevant.
Malfunction is detected in accelerator pedal position signal that is output from ECM through CAN communication. Also, the signal voltage from accelerator pedal position sensor may be abnormally high or low.