What does code P1647 mean?

Q: What does code P1647 mean?

Driver 1 Line 7. P1647 on GM vehicles means the powertrain control module (PCM) has detected a fault on the serial data line it uses to communicate with driver 1, specifically line 7 of that communication bus. The PCM monitors the voltage and message traffic on this line and sets the code when the signal is missing, out of range, or corrupted, which can disable communication with one or more modules.

DTC codes / GM codes / P1647

P1647 · GMDriver 1 Line 7

P1647 on GM vehicles means the powertrain control module (PCM) has detected a fault on the serial data line it uses to communicate with driver 1, specifically line 7 of that communication bus. The PCM monitors the voltage and message traffic on this line and sets the code when the signal is missing, out of range, or corrupted, which can disable communication with one or more modules.

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.