AutoCodes – GMC – U1511 GMC

U1511 GMC Code - Headlamp Control Module/Headlamp Leveling Control Module Lost Communication With Left 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 Left Headlamp, Left Headlamp harness is open or shorted, Left 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: U1511 GMC indicates Headlamp Control Module/Headlamp Leveling Control Module Lost Communication With Left Headlamp On LIN Bus.
Common causes: Common causes include Faulty Left Headlamp, Left Headlamp harness is open or shorted, Left 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 4,774

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 U1511 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 Left Headlamp has not been received.

OBDII Code U1511 GMC - Headlamp Control Module/Headlamp Leveling Control Module Lost Communication With Left Headlamp On LIN Bus - AutoCodes.com — U1511 GMC Code - Headlamp Control Module/Headlamp Leveling Control Module Lost Communication With Left Headlamp On LIN Bus

What does this mean?

What are the Possible Causes of the DTC U1511 GMC?

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 to Fix the DTC U1511 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 U1511 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 U1511 GMC Code

1. What are the common symptoms of OBDII code U1511 in a GMC related to the Headlamp Control Module/Headlamp Leveling Control Module?

- Dim or flickering left headlamp, headlamp leveling issues, dashboard warning light related to headlamp system.

2. What can cause the OBDII code U1511 in a GMC indicating a lost communication with the left headlamp on the LIN bus?

- Loose or damaged wiring connections, faulty headlamp control module, issues with the LIN bus communication network.

3. How can I diagnose the OBDII code U1511 in a GMC for communication loss with the left headlamp module?

- Use a diagnostic scanner to retrieve the specific trouble code, inspect wiring and connections to the left headlamp control module, check for LIN bus communication faults.

4. Is it safe to continue driving with the OBDII code U1511 related to the left headlamp communication issue in a GMC?

- It is not recommended to drive with this code as it can affect headlamp functionality, potentially compromising visibility and safety.

5. Can I reset the OBDII code U1511 in a GMC myself after repairing the communication issue with the left headlamp module?

- Yes, after resolving the root cause, you can use a diagnostic scanner to clear the trouble code and reset the system.

6. How much does it typically cost to repair the OBDII code U1511 related to the headlamp control module communication problem in a GMC?

- The cost can vary depending on the exact issue, but it may involve wiring repairs, module replacement, or network diagnostics, potentially ranging from $100 to $500 or more.

7. Are there any DIY tips for troubleshooting the OBDII code U1511 in a GMC before seeking professional help?

- Check for visible wiring damage, ensure connectors are secure, and try resetting the system by disconnecting the car battery for a few minutes.

8. Will the OBDII code U1511 in a GMC cause any additional problems besides the left headlamp communication issue?

- While the primary concern is the headlamp control module communication, unresolved issues can lead to related electrical problems or affect other vehicle systems.

9. How long does it typically take to repair the OBDII code U1511 indicating a lost communication with the left headlamp module in a GMC?

- The repair time can vary based on the exact cause and complexity of the issue, but it may take anywhere from 1 to 4 hours at a repair shop.

10. Is the OBDII code U1511 specific to GMC vehicles, or can it occur in other car makes and models as well?

- While the specific code may vary by manufacturer, similar communication issues with headlamp modules can occur in other vehicles using LIN bus technology.