Head-Up Display Information Down Switch Circuit
Table of contents
B3621 GMC Possible Causes
- Faulty Head-Up Display Information Down Switch
- Head-Up Display Information Down Switch harness is open or shorted
- Head-Up Display Information Down Switch circuit poor electrical connection
How do I fix code B3621 GMC?
Check 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.
Cost of diagnosing the B3621 GMC code
The cost of diagnosing the B3621 GMC code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
B3621 GMC Description
The Head-Up Display (HUD) monitors the HUD information-down switch signal circuit in order to perform the switch functions. When the HUD information-down switch is depressed and the ignition is in the RUN position, the switch signal to the HUD is low. When the HUD detects that the HUD information-down switch signal is low for greater than 60 seconds, the Diagnostic Trouble Code (DTC) B3621 sets.