B1966 Code: Meaning, Causes, and Symptoms | OBD2 Codes

B1966 – A/C Post Heater Sensor Circuit Failure

 

B1966 Possible Symptoms

 

Engine Light ON (or Service Engine Soon Warning Light)

 

B1966 Possible Causes

 

Faulty A/C Post Heater Sensor,A/C Post Heater Sensor harness is open or shorted,A/C Post Heater Sensor circuit poor electrical connection,Faulty Dual Automatic Temperature Control (DATC) Module

 

B1966 Description

 

The Dual Automatic Temperature Control (DATC) Module monitors the A/C Post Heater Sensor. The DATC sets the OBDII code when the A/C Post Heater Sensor is not to factory specifications.