AutoCodes – Cadillac – U1162 Cadillac

U1162 Cadillac 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 Cadillac 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 1,090

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

What does this mean?

What are the Possible Causes of the DTC U1162 Cadillac?

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 Cadillac?

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 Cadillac 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 Cadillac Code

1. What does the OBDII code U1162 mean in a Cadillac?

U1162 indicates a "Lost Communication With Liftgate/Endgate Control Module," meaning the vehicle's control systems are unable to communicate with the liftgate control module.

2. What are the common symptoms of the U1162 code?

Symptoms may include the liftgate not opening or closing properly, intermittent functionality, warning lights on the dashboard, or a failure in related electronic features.

3. What causes the U1162 code to appear?

Common causes include faulty wiring or connectors, a malfunctioning liftgate control module, software issues, or a problem with the vehicleâ€™s CAN (Controller Area Network) communication system.

4. Can a weak battery cause the U1162 code?

Yes, a weak or failing battery can disrupt communication between modules, potentially triggering the U1162 code.

5. How do I diagnose the U1162 code?

Start by checking the wiring and connectors for damage or corrosion, inspect the liftgate module for functionality, and use a scan tool to verify communication on the CAN network.

6. Is the liftgate control module always the issue with a U1162 code?

No, the problem could stem from wiring issues, a network fault, or even a failed power or ground connection rather than the module itself.

7. Can I still drive my Cadillac with a U1162 code?

Yes, the vehicle is usually drivable, but the liftgate may not function properly, which could be inconvenient or impact access to the cargo area.

8. How much does it cost to repair the U1162 code?

Repair costs vary depending on the issue but may range from $100 for wiring repairs to $500 or more if the liftgate control module needs replacement.

9. Can I clear the U1162 code without repairing the issue?

Clearing the code without addressing the root cause may temporarily remove the warning, but the issue is likely to return until repairs are made.

10. Can software updates fix the U1162 code on a Cadillac?

In some cases, a software update for the liftgate control module or related systems may resolve communication issues, but this depends on the specific fault.