What does code P1687 mean?

Q: What does code P1687 mean?

Driver 5 Line 7. P1687 on GM vehicles means the powertrain control module (PCM) has detected an open, short, or out-of-range condition on the serial data line it uses to communicate with driver 5, which is typically the instrument panel cluster or a body control module depending on the platform. The PCM monitors the voltage and message traffic on this dedicated low-speed data circuit and sets the code when the expected signal is missing or corrupted for a calibrated time.

DTC codes / GM codes / P1687

P1687 · GMDriver 5 Line 7

P1687 on GM vehicles means the powertrain control module (PCM) has detected an open, short, or out-of-range condition on the serial data line it uses to communicate with driver 5, which is typically the instrument panel cluster or a body control module depending on the platform. The PCM monitors the voltage and message traffic on this dedicated low-speed data circuit and sets the code when the expected signal is missing or corrupted for a calibrated time.

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.