B181E Code: Meaning, Causes, and Symptoms | OBD2 Codes

B181E – Hood Ajar Input Circuit Open

 

B181E Possible Symptoms

 

Engine Light ON (or Service Engine Soon Warning Light)

 

B181E Possible Causes

 

Faulty Hood Ajar Switch,Hood Ajar Switch harness is open or shorted,Hood Ajar Switch circuit poor electrical connection,Faulty Body Control Module (BCM)

 

B181E Description

 

The Body Control Module (BCM) provides a reference voltage on the hood ajar switch sense circuit. The Hood Ajar Switch switches the hood ajar switch sense circuit to ground when the hood is open. A diagnostic resistor internal to the switch is placed in parallel with the switch. When the BCM detects that the parallel resistor is not detected in the circuit and the switch is not closed.