What does code P1605 mean?

Q: What does code P1605 mean?

Loss Of HVAX Serial Data. P1605 on GM vehicles indicates that the powertrain control module (PCM) has lost serial data communication with the hybrid vehicle control module (HVCM) over the HVAX (Hybrid Vehicle Area Network) bus. The PCM sets this code when it fails to receive expected periodic messages from the HVCM, which can be due to a wiring fault, a failed module, or a power/ground issue affecting the communication line.

DTC codes / GM codes / P1605

P1605 · GMLoss Of HVAX Serial Data

P1605 on GM vehicles indicates that the powertrain control module (PCM) has lost serial data communication with the hybrid vehicle control module (HVCM) over the HVAX (Hybrid Vehicle Area Network) bus. The PCM sets this code when it fails to receive expected periodic messages from the HVCM, which can be due to a wiring fault, a failed module, or a power/ground issue affecting the communication line.

SystemPowertrain

Code typeGM specific

SeverityMedium

Fix difficultyProfessional

AreaComputer and output circuits

Guidance is general and written for GM vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.