B1128 Code: Meaning, Causes, and Symptoms | OBD2 Codes

B1128 – Driver Side Door Lock Switch Signal Error

 

B1128 Possible Symptoms

 

Engine Light ON (or Service Engine Soon Warning Light)

 

B1128 Possible Causes

 

Faulty Driver Side Door Lock Switch,Driver Side Door Lock Switch harness is open or shorted,Driver Side Door Lock Switch circuit poor electrical connection,Faulty Door Multiplex Control Unit

 

B1128 Description

 

The Door Multiplex Control Unit monitors the Driver Side Door Lock Switch. The Door Multiplex Control Unit sets the OBDII code when the Driver Side Door Lock Switch is not to factory specifications.