AutoCodes – GMC – U1162 GMC

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

Quick Answer

Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Common causes include Faulty Liftgate/Endgate Control Module (LGM/EGM), Liftgate/Endgate Control Module harness is open or shorted, Liftgate/Endgate 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: U1162 GMC indicates Lost Communications With Liftgate/Endgate Control Module.
Common causes: Common causes include Faulty Liftgate/Endgate Control Module (LGM/EGM), Liftgate/Endgate Control Module harness is open or shorted, Liftgate/Endgate 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 1,338

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 Apr 24, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1162 GMC Description

Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. When a module receives a message for a critical operating parameter, the module records the identification number of the module which sent the message for the state of health monitoring/node alive messages. A critical operating parameter is one which, when not received, requires that the module use a default value for that parameter. Once an identification number is learned by a module, it will monitor for that module node alive message. Each module on the class 2 serial data circuit is required to send a Node Alive message every 2 seconds. When no message is detected from a learned identification number for 5 seconds, a Diagnostic Trouble Code (DTC) U1162 is set.

OBDII Code U1162 GMC - Lost Communications With Liftgate/Endgate Control Module - AutoCodes.com — U1162 GMC Code - Lost Communications With Liftgate/Endgate Control Module

What does this mean?

What are the Possible Causes of the DTC U1162 GMC?

Faulty Liftgate/Endgate Control Module (LGM/EGM)
Liftgate/Endgate Control Module harness is open or shorted
Liftgate/Endgate Control Module circuit poor electrical connection

How to Fix the DTC U1162 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 U1162 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 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.