U1521 GMC Code - Headlamp Control Module/Headlamp Leveling Control Module Lost Communication With Left Headlamp On LIN Bus
|U1521 GMC code possible causes
- Faulty Left Headlamp
- Left Headlamp harness is open or shorted
- Left Headlamp circuit poor electrical connection
- Faulty Headlamp Control Module/Headlamp Leveling Control Module
|How do I fix the U1521 GMC code?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 U1521 GMC code
Labor: 1.0The cost of diagnosing the U1521 GMC 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.
|What are U1521 GMC code possible symptoms?
- Engine Light ON (or Service Engine Soon Warning Light)
|U1521 GMC code descriptionThe Local Interconnect Network (LIN) Bus consists of a single wire with a transmission rate of 10.417 Kbit/s. The serial data is transmitted over a LIN circuit between a master control module and other LIN devices within a particular subsystem. If serial data communication is lost between any of the LIN devices on the LIN bus network, the master control module will set a no communication code against the non-communicating LIN device. The Diagnostic Trouble Code (DTC) will set when a supervised periodic message to the Headlamp Control Module/Headlamp Leveling Control Module from the Left Headlamp has not been received.
|Need more information with the U1521 GMC code?Need more information on how to fix the U1521 GMC code?
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|U1521 GMC code commentsHelp us improve AutoCodes.com. Leave a comment below or tell us if the information above helps you fix the code. What are the symptoms on your vehicle for the U1521 Gmc code? Have you replaced any parts?
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