P16B1 – Engine Control Module Self-Test Idle Air Control System Fault

P16B1 Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

P16B1 Possible Causes

Faulty Idle Air Control (IAC),Idle Air Control (IAC) harness is open or shorted,Idle Air Control (IAC) circuit poor electrical connection,Faulty Engine Control Module (ECM)

P16B1 Description

The Engine Control Module (ECM) monitors the Idle Air Control (IAC). The ECM sets the OBDII code when the Idle Air Control (IAC) is not to factory specifications.