DTC P2176-51: Throttle Actuator "A" Control System - Idle Position Not Learned - Not programmed: Action

Check the vehicle charging system performance to ensure the voltage regulation is correct
Refer to the relevant service information and the BATTERY & CHARGING SYSTEM - GENERAL INFORMATION -- LR2/L359 , inspect the vehicle battery and ensure it is fully charged and serviceable before performing further tests
Turn the ignition off, allow the engine control module to power latch. Turn on the ignition wait 60 seconds, then start the engine. This process will allow throttle adaption data to be stored