The DTC P2177 OBDII code is related to the value to help control the amount of fuel injected into the engine. This code indicates that the PCM has detected a lean condition. This means that the air/fuel ratio has an excess of air. This code refers to bank number 1, i.e. the side of the engine where cylinder 1 is located.
To solve this code, you must take into account the vehicle manufacturer since the diagnostic steps depend greatly on the type of fuel system, the kind of Mass Air Flow (MAF), and Oxygen (O2) sensors.