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U1520 GMC Code - Driver/Passenger Seat Memory Control Module Lost Communication With Driver/Passenger Seat Bolster Memory Control Module On LIN Bus

Quick Answer

The U1520 GMC code indicates that there is a communication problem between the Driver/Passenger Seat Memory Control Module and the Driver/Passenger Seat Bolster Memory Control Module on the LIN bus. Common causes include Loose or damaged wiring connections between the modules, Faulty Driver/Passenger Seat Memory Control Module, Faulty Driver/Passenger Seat Bolster Memory Control Module. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
U1520 GMC indicates Driver/Passenger Seat Memory Control Module Lost Communication With Driver/Passenger Seat Bolster Memory Control Module On LIN Bus.
Common causes
Common causes include Loose or damaged wiring connections between the modules, Faulty Driver/Passenger Seat Memory Control Module, Faulty Driver/Passenger Seat Bolster Memory Control Module.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Aug 19, 2024
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Code U1520 GMC Description

The U1520 GMC code indicates that there is a communication problem between the Driver/Passenger Seat Memory Control Module and the Driver/Passenger Seat Bolster Memory Control Module on the LIN bus. The LIN bus is a communication network in the vehicle that allows various modules to exchange information. When these two modules are unable to communicate, it can lead to issues with the seat memory functions, such as the inability to store or recall seat positions, adjust seat bolstering, or control other seat-related features. This can impact the comfort and convenience of the vehicle for the driver and passengers.

OBDII Code U1520 GMC - Driver/Passenger Seat Memory Control Module Lost Communication With Driver/Passenger Seat Bolster Memory Control Module On LIN Bus
U1520 GMC Code - Driver/Passenger Seat Memory Control Module Lost Communication With Driver/Passenger Seat Bolster Memory Control Module On LIN Bus

Common Causes of U1520 GMC

  1. Loose or damaged wiring connections between the modules
  2. Faulty Driver/Passenger Seat Memory Control Module
  3. Faulty Driver/Passenger Seat Bolster Memory Control Module
  4. Corrosion or water damage in the module connectors
  5. Software issues causing communication errors

Symptoms of U1520 GMC

  1. Inability to store or recall seat positions
  2. Malfunctioning seat bolster adjustment
  3. Error messages related to seat memory functions on the dashboard
  4. Unresponsive seat controls
  5. Illumination of the airbag warning light

How to Fix U1520 GMC

  1. Perform a thorough inspection of the wiring harness and connectors for any damage or corrosion.
  2. Check the power and ground connections to the Driver/Passenger Seat Memory Control Module and the Bolster Memory Control Module.
  3. Use a diagnostic scan tool to communicate with the modules and identify the source of the communication error.
  4. Replace any faulty modules if necessary.
  5. Clear the diagnostic trouble codes and test the seat memory functions to ensure proper operation.

Cost to Fix U1520 GMC

The cost of repairing the U1520 GMC code can vary depending on the specific cause of the communication issue. In general, the repair costs for this type of problem can range from $200 to $500, including parts and labor. However, it's important to note that labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate. Additionally, the cost may be higher if any modules need to be replaced.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about U1520 GMC Code

1. What are the common symptoms of OBDII code U1520 in a GMC vehicle?

The common symptoms of U1520 include issues with the driver/passenger seat memory functions, such as inability to adjust seat positions or recall saved settings.

2. What could cause the OBDII code U1520 in a GMC vehicle?

The code U1520 usually indicates a communication problem between the Driver/Passenger Seat Memory Control Module and the Seat Bolster Memory Control Module on the LIN bus network.

3. How can I diagnose the U1520 code in my GMC vehicle?

Diagnosing the U1520 code typically involves checking the wiring harness, connectors, and communication between the affected modules using a diagnostic scan tool.

4. Can a DIY enthusiast repair the U1520 code in a GMC vehicle?

Repairing the U1520 code often requires specialized tools and knowledge of vehicle electronics. It is recommended to consult a professional mechanic for accurate diagnosis and repair.

5. Is it safe to drive with the U1520 code illuminated on the dashboard?

It is generally safe to drive with the U1520 code, as it mainly affects the seat memory functions. However, it is essential to address the issue promptly to avoid potential inconvenience.

6. Can resetting the vehicle's computer system clear the U1520 code?

Resetting the vehicle's computer system may temporarily clear the U1520 code, but if the underlying communication issue persists, the code is likely to reappear.

7. What are the potential implications of ignoring the U1520 code in a GMC vehicle?

Ignoring the U1520 code may result in continued malfunction of the seat memory control system, leading to inconvenience and potential discomfort while driving.

8. Are there any recalls or service bulletins related to the U1520 code in GMC vehicles?

Check with authorized GMC dealerships or visit the manufacturer's website to inquire about any recalls or service bulletins related to the U1520 code in your specific vehicle model.

9. How much does it cost to repair the U1520 code in a GMC vehicle?

The cost of repairing the U1520 code can vary depending on the extent of the communication issue and the specific components that need to be repaired or replaced.

10. Can extreme weather conditions affect the appearance of the U1520 code in a GMC vehicle?

Extreme weather conditions can sometimes exacerbate electrical issues, including communication problems between modules, which may lead to the U1520 code being triggered.

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