DTC P0500 GMC

Description

The Headlamp Control Module (HCM) checks its own system voltage by comparing the DC voltage to the system voltage in the Central electronic module (CEM). Information about the system voltage in the Central electronic module (CEM) is transmitted via CAN to the Headlamp Control Module (HCM). The diagnostic trouble code (DTC) is stored if the control module detects that: Direct voltage to control module is higher than 16.0 V. The control modules test for the diagnostic trouble code (DTC) starts in the event of: Ignition switch position II. Note! The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.