2014 Chevy Silverado Accelerator Pedal, Code P2138 (sensors 1&2 correlation)

In this video, i mention accelerometer a few times but it's really the accelerator pedal sensor i'm talking about and there are 2 position sensors in the pedal. This Silverado started running poorly and started flagging error codes associated with the accelerator pedal and the throttle body. these codes put the truck in the limp mode and was not easy to drive at fast speeds. the guys were away from the repair shop and decided to put in a new accelerator pedal and throttle body controller. they were hoping that the switch would fix everything and allow them to get back on the road. The truck was still having issues so I put a scan tool on it and found out that the accelerator pedal which includes two position sensors inside of it was not working well even though it was a new unit from the auto store. I don't think this part was a GM component but some other aftermarket variant. after running the scan tool, I concluded that the new pedal sensor did not operate correctly so put the old one back into the truck and all worked well after that point. I concluded that the throttle body controller was the cause of the error codes originally. replacing the new pedal with an aftermarket component didn't help the cause. On a 2010 Silverado, replacing the accelerator pedal position sensor (APPS) doesn't typically require a specific "calibration" procedure in the sense of manually balancing or correlating the two sensors. The vehicle's computer (PCM) automatically learns the new sensor's values. However, there are important steps to ensure proper function: Proper Installation: The most crucial step is ensuring the new APPS is installed correctly. This includes proper seating, secure connection, and accurate alignment. A poorly installed sensor will lead to problems regardless of any further steps. Refer to a repair manual for precise installation instructions. Key On/Engine Off (KOEO) Self-Test: After installation, the PCM will typically perform a self-test with the key on, engine off. This allows the computer to read the new sensor's values and establish a baseline. Driving Cycle: The most important "calibration" is the driving cycle. Drive the truck for a short distance (10-20 miles) under varying conditions (acceleration, deceleration, idling). This allows the PCM to learn the full range of the new sensor's output and adapt accordingly. The PCM uses this data to create a relationship between the throttle position and engine response. Diagnostic Trouble Code (DTC) Check: After the driving cycle, use an OBD-II scanner to check for any DTCs (Diagnostic Trouble Codes). If any codes related to the APPS or throttle position remain, there might be a problem with the installation, wiring, or the new sensor itself. Important Considerations: Two Sensors: While many vehicles have two APPS sensors for redundancy, they don't need manual balancing. The PCM uses both signals to cross-reference and ensure accuracy. If one sensor fails, the PCM usually defaults to the other.