AutoCodes – GMC – U1512 GMC

U1512 GMC Code - Headlamp Control Module/Headlamp Leveling Control Module Lost Communication With Right Headlamp 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, Right Headlamp harness is open or shorted, Right Headlamp 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: U1512 GMC indicates Headlamp Control Module/Headlamp Leveling Control Module Lost Communication With Right Headlamp On LIN Bus.
Common causes: Common causes include Faulty Right Headlamp, Right Headlamp harness is open or shorted, Right Headlamp 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 775

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 02, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1512 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 Headlamp Control Module/Headlamp Leveling Control Module from Right Headlamp has not been received.

OBDII Code U1512 GMC - Headlamp Control Module/Headlamp Leveling Control Module Lost Communication With Right Headlamp On LIN Bus - AutoCodes.com — U1512 GMC Code - Headlamp Control Module/Headlamp Leveling Control Module Lost Communication With Right Headlamp On LIN Bus

What does this mean?

What are the Possible Causes of the DTC U1512 GMC?

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

How to Fix the DTC U1512 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 U1512 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 U1512 GMC Code

1. What are common symptoms of OBDII code U1512 GMC?

- Common symptoms include malfunctioning or erratic behavior of the right headlamp, dim or flickering headlight, or dashboard warning light indicating a headlamp control module communication issue.

2. What could cause the U1512 GMC code to trigger?

- The code U1512 GMC is typically triggered when the headlamp control module or headlamp leveling control module loses communication with the right headlamp on the LIN bus. This can be due to wiring issues, a faulty module, or a poor connection.

3. How do I diagnose the U1512 GMC code?

- To diagnose the U1512 GMC code, it is recommended to check the wiring harness and connections leading to the right headlamp control module, inspect the module for any visible damage, and perform a scan tool diagnosis to identify the communication issue.

4. Can I still drive my vehicle with the U1512 GMC code?

- It is not recommended to drive your vehicle with the U1512 GMC code as it may affect the proper functioning of the headlamp, compromising visibility and safety, especially in low-light conditions.

5. How can I repair the U1512 GMC code?

- Repairing the U1512 GMC code involves addressing the communication loss between the headlamp control module and the right headlamp. This may include repairing or replacing damaged wiring, fixing poor connections, or replacing the faulty module.

6. Is the U1512 GMC code a serious issue?

- While the U1512 GMC code may not affect the drivability of the vehicle, it is considered a serious issue as it can impact the proper functioning of the headlamp, compromising visibility and safety while driving.

7. Can weather conditions cause the U1512 GMC code to trigger?

- Extreme weather conditions such as moisture or water exposure can potentially cause the U1512 GMC code to trigger by affecting the connections or components related to the headlamp control module.

8. How long does it take to repair the U1512 GMC code?

- The time to repair the U1512 GMC code can vary depending on the exact cause of the communication loss. Simple fixes like reconnecting loose wires may take a short time, while replacing a faulty module can be more time-consuming.

9. Can I reset the U1512 GMC code myself?

- You can attempt to clear the U1512 GMC code using an OBDII scanner, but it is recommended to diagnose and repair the underlying issue causing the code before resetting it to prevent it from recurring.

10. Will the U1512 GMC code cause my vehicle to fail an emissions test?

- The U1512 GMC code is not directly related to emissions, so it may not cause your vehicle to fail an emissions test. However, it is still important to address and repair the issue to ensure the overall functionality of your vehicle.