AutoCodes – GMC – U1520 GMC

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 Local Interconnect Network (LIN) Bus consists of a single wire with a transmission rate of 10.417 Kbit/s. Common causes include Faulty Driver/Passenger Seat Bolster Memory Control Module, Driver/Passenger Seat Bolster Memory Control Module harness is open or shorted, Driver/Passenger Seat Bolster Memory Control Module circuit poor electrical connection. 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 Faulty Driver/Passenger Seat Bolster Memory Control Module, Driver/Passenger Seat Bolster Memory Control Module harness is open or shorted, Driver/Passenger Seat Bolster Memory Control Module circuit poor electrical connection.
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.

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Code Popularity 836

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Jun 03, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1520 GMC Description

The 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 Driver/Passenger Seat Memory Control Module from the Driver/Passenger Seat Bolster Memory Control Module has not been received.

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

What does this mean?

What are the Possible Causes of the DTC U1520 GMC?

Faulty Driver/Passenger Seat Bolster Memory Control Module
Driver/Passenger Seat Bolster Memory Control Module harness is open or shorted
Driver/Passenger Seat Bolster Memory Control Module circuit poor electrical connection
Faulty Driver/Passenger Seat Memory Control Module

How to Fix the DTC U1520 GMC?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U1520 GMC code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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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.