P1605 BUICK, CADILLAC, CHEVROLET, GMC: LOSS OF SERIAL HVAC DATA
POST UPDATED IN February, 2023
P1605 BUICK, CADILLAC, CHEVROLET, GMC: LOSS OF SERIAL HVAC DATA
HVAC (Heating, Ventilation, and Air Conditioning) is a system used to control the temperature inside the car. It regulates it to provide comfort to its occupants. This system is in charge of the air conditioning and heating system.
The HVAC system is continuously monitored by the PCM (Powertrain Control Module) to check the best performance. If this controller notices valid or non-serial data from the VVAC module for a period longer than 11 seconds, the fault code P1605 OBDII will be set.
These are the reasons for setting the P1605 OBD2 diagnostic code:
To troubleshoot the DTC P1605 OBDII code, make this: