Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.
The cost to diagnose the B0530 HUMMER code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.
When the Body Control Module (BCM) receives a left turn signal ON command from the turn signal switch, the BCM will apply a voltage to the left turn signal indicator supply voltage circuit. The turn signal flasher, which is integrated within the BCM, will flash the left turn signal indicator lamp in the Instrument Panel Cluster (IPC) simultaneously with the turn signal lamps. The BCM will set the Diagnostic Trouble Code (DTC) when the BCM receives a left turn signal command and the left turn signal indicator supply voltage circuit is open, shorted to ground, or shorted to voltage.
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