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Engine-Codes – GMC – U1162 GMC

U1162 GMC Code - Lost Communications With Liftgate/Endgate Control Module

Quick Answer

The U1162 GMC code indicates that there is a communication error between the vehicle's main computer system and the liftgate/endgate control module. Common causes include Loose or corroded wiring connections, Faulty liftgate/endgate control module, Damaged liftgate/endgate motor. 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
U1162 GMC indicates Lost Communications With Liftgate/Endgate Control Module.
Common causes
Common causes include Loose or corroded wiring connections, Faulty liftgate/endgate control module, Damaged liftgate/endgate motor.
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 Sep 16, 2024
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Code U1162 GMC Description

The U1162 GMC code indicates that there is a communication error between the vehicle's main computer system and the liftgate/endgate control module. This module is responsible for controlling the operation of the liftgate or endgate on the vehicle, which includes functions such as opening, closing, and locking. When communication is lost with this module, it can lead to issues with the proper functioning of the liftgate/endgate.

OBDII Code U1162 GMC - Lost Communications With Liftgate/Endgate Control Module
U1162 GMC Code - Lost Communications With Liftgate/Endgate Control Module

Common Causes of U1162 GMC

  1. Loose or corroded wiring connections.
  2. Faulty liftgate/endgate control module.
  3. Damaged liftgate/endgate motor.
  4. Issues with the vehicle's main computer system.
  5. Water damage to the liftgate/endgate components.

Symptoms of U1162 GMC

  1. Inability to open or close the liftgate/endgate.
  2. Unresponsive liftgate/endgate controls.
  3. Warning light illuminated on the dashboard.
  4. Strange noises coming from the liftgate/endgate area.
  5. Intermittent operation of the liftgate/endgate.

How to Fix U1162 GMC

  1. Begin by inspecting the wiring connections between the main computer system and the liftgate/endgate control module. Repair or replace any damaged or corroded wires.
  2. Test the liftgate/endgate control module for proper functionality. If faulty, replace the module with a new one.
  3. Check the liftgate/endgate motor for any signs of damage or wear. Replace the motor if necessary.
  4. Perform a diagnostic scan on the vehicle's main computer system to ensure proper communication with the liftgate/endgate control module.
  5. Clear the U1162 code from the vehicle's memory using a diagnostic scanner once the repairs have been completed.

Cost to Fix U1162 GMC

The typical repair costs for addressing the U1162 GMC code can range from $200 to $500, including parts and labor. However, the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's advisable to check local rates for a more precise estimate. Keep in mind that rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less for similar services.

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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 U1162 GMC Code

1. What are the common symptoms of OBDII code U1162 GMC?

The common symptoms of U1162 GMC include non-functioning liftgate or endgate, inoperative power liftgate, and warning lights on the dashboard.

2. What are the likely causes of OBDII code U1162 GMC?

The likely causes of U1162 GMC are a faulty liftgate/endgate control module, damaged wiring or connectors, or a communication error within the vehicle's network.

3. How can I diagnose the issue related to code U1162 GMC?

To diagnose the issue, you can use a diagnostic scanner to retrieve the trouble codes, inspect the liftgate/endgate control module and its connections, and perform a thorough check of the wiring harness for any damage.

4. Can I still drive my vehicle with OBDII code U1162 GMC?

It is generally safe to drive your vehicle with U1162 GMC, but you may experience inconvenience due to the non-functioning liftgate or endgate. It is recommended to get the issue fixed as soon as possible.

5. How can I repair OBDII code U1162 GMC?

Repairing U1162 GMC involves replacing the faulty liftgate/endgate control module if necessary, repairing any damaged wiring or connectors, and clearing the trouble codes with a diagnostic scanner.

6. Is it possible to reset OBDII code U1162 GMC without repairs?

While you can clear the trouble codes temporarily by resetting the system, the issue causing U1162 GMC will likely reappear if the underlying problem is not addressed through proper repairs.

7. Can weather conditions affect OBDII code U1162 GMC?

Extreme weather conditions, such as exposure to moisture or temperature fluctuations, can potentially contribute to the development of U1162 GMC by causing corrosion or damage to the control module and wiring.

8. Are there any preventive measures to avoid OBDII code U1162 GMC?

Regularly inspecting the liftgate/endgate system, keeping the connections clean and secure, and addressing any issues promptly can help prevent the occurrence of U1162 GMC.

9. Will U1162 GMC cause any long-term damage to my vehicle?

While U1162 GMC itself may not cause immediate long-term damage, prolonged neglect of the issue can lead to further electrical problems and potential safety hazards related to the liftgate or endgate operation.

10. How long does it take to repair OBDII code U1162 GMC?

The repair time for U1162 GMC can vary depending on the exact cause of the issue, availability of parts, and the expertise of the technician. In general, it may take a few hours to a day to complete the necessary repairs.

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