AutoCodes – GMC – U1532 GMC

U1532 GMC Code - Headlamp Control Module/Headlamp Leveling Control Module Lost Communication With Right Headlamp Assembly 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 Right Headlamp Assembly, Right Headlamp Assembly harness is open or shorted, Right Headlamp Assembly 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: U1532 GMC indicates Headlamp Control Module/Headlamp Leveling Control Module Lost Communication With Right Headlamp Assembly On LIN Bus.
Common causes: Common causes include Faulty Right Headlamp Assembly, Right Headlamp Assembly harness is open or shorted, Right Headlamp Assembly 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 451

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 U1532 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 Headlamp Control Module/Headlamp Leveling Control Module from the Right Headlamp Assembly has not been received.

OBDII Code U1532 GMC - Headlamp Control Module/Headlamp Leveling Control Module Lost Communication With Right Headlamp Assembly On LIN Bus - AutoCodes.com — U1532 GMC Code - Headlamp Control Module/Headlamp Leveling Control Module Lost Communication With Right Headlamp Assembly On LIN Bus

What does this mean?

What are the Possible Causes of the DTC U1532 GMC?

Faulty Right Headlamp Assembly
Right Headlamp Assembly harness is open or shorted
Right Headlamp Assembly circuit poor electrical connection
Faulty Headlamp Control Module/Headlamp Leveling Control Module

How to Fix the DTC U1532 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 U1532 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 U1532 GMC Code

What does the OBDII code U1532 mean for my GMC vehicle?

The U1532 code indicates that there is a loss of communication between the Headlamp Control Module and the Right Headlamp Assembly on the LIN (Local Interconnect Network) bus.

What are common symptoms of the U1532 code?

Common symptoms include malfunctioning headlights, such as one headlight not working, flickering lights, or automatic leveling features not functioning properly.

What could cause the U1532 code to trigger?

Causes may include a faulty headlamp assembly, damaged wiring or connectors, a malfunctioning Headlamp Control Module, or issues with the LIN bus communication.

How can I diagnose the U1532 code?

Start by checking the wiring and connectors for damage or corrosion. Use a scan tool to confirm the code and check for any additional codes that may help identify the root cause.

Can I fix the U1532 code myself?

Yes, if you're comfortable with automotive repairs, you can check and repair wiring or connectors. However, if the Headlamp Control Module needs replacement, it may require professional assistance.

What should I do if the right headlamp isn't working?

Check the bulb first to ensure it's not burned out. If the bulb is fine, inspect the wiring and connections for damage before considering module replacement.

Is it safe to drive with the U1532 code active?

While it may not pose an immediate safety risk, driving with malfunctioning headlights can reduce visibility and increase the chance of accidents; it's best to address the issue promptly.

Will clearing the U1532 code fix the problem?

Clearing the code may temporarily turn off the warning light, but it won't fix the underlying issue. Proper diagnosis and repair are necessary to prevent the code from returning.

Can a bad battery affect the U1532 code?

Yes, a weak or failing battery can cause communication issues in the vehicle's electrical system, potentially leading to the U1532 code being triggered.

What is the cost of repairing the U1532 code?

Repair costs can vary widely depending on the cause, ranging from a simple wiring fix to replacing the Headlamp Control Module, which can cost between $100 to $500 or more, including parts and labor.