B1851 Code: Meaning, Causes, and Symptoms | OBD2 Codes

B1851 – Climate Control Temperature Differential Circuit Short To Battery

 

B1851 Possible Symptoms

 

Engine Light ON (or Service Engine Soon Warning Light)

 

B1851 Possible Causes

 

Faulty Climate Control Temperature Sensor,Climate Control Temperature Sensor harness is open or shorted,Climate Control Temperature Sensor circuit poor electrical connection,Faulty Body Control Module (BCM)

 

B1851 Description

 

The Body Control Module (BCM) monitors the Climate Control Temperature Differential. The BCM sets the OBDII code when the Climate Control Temperature Differential is not to factory specifications.