2006 Infiniti M35 with engine code P2138, what is the meaning?
You probably have a problem with the throttle motor. You could try cleaning the throttle plate first and performing an Idle Air Volume Learning procedure, but if the problem persist you have to replaced the throttle motor.
P2138 INFINITI - Accelerator Pedal Position Sensor Circuit Range/Performance Read more: https://www.autocodes.com/p2138_infiniti.html
Idle Air Volume Learning Procedure instruction: http://infinitihelp.com/diy/m/projects/infiniti_m_idle_air_volume_learning.php
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