AutoCodes – GMC – U1193 GMC

U1193 GMC Code - Loss Of Vehicle Immobilizer Module Communications

Quick Answer

Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Common causes include Faulty Vehicle Immobilizer Module, Vehicle Immobilizer Module harness is open or shorted, Vehicle Immobilizer 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: U1193 GMC indicates Loss Of Vehicle Immobilizer Module Communications.
Common causes: Common causes include Faulty Vehicle Immobilizer Module, Vehicle Immobilizer Module harness is open or shorted, Vehicle Immobilizer 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 3,133

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 26, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1193 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) U1193 is set.

OBDII Code U1193 GMC - Loss Of Vehicle Immobilizer Module Communications - AutoCodes.com — U1193 GMC Code - Loss Of Vehicle Immobilizer Module Communications

What does this mean?

What are the Possible Causes of the DTC U1193 GMC?

Faulty Vehicle Immobilizer Module
Vehicle Immobilizer Module harness is open or shorted
Vehicle Immobilizer Module circuit poor electrical connection

How to Fix the DTC U1193 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 U1193 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 U1193 GMC Code

1. What are common symptoms of the OBDII code U1193 GMC?

- Common symptoms include difficulty starting the vehicle, engine stalling, and the inability to turn the ignition key.

2. What could cause the U1193 GMC code to trigger?

- The U1193 code is typically triggered by a communication error between the vehicle's immobilizer module and the rest of the system.

3. How can I diagnose the U1193 code on my GMC vehicle?

- Diagnosing the U1193 code usually involves using a diagnostic scanner to retrieve the specific fault codes and testing the communication between the immobilizer module and other modules.

4. What are some repair tips for fixing the U1193 GMC code?

- Repairing the U1193 code may involve checking and repairing any damaged wiring or connectors related to the immobilizer system, resetting the system, or reprogramming the immobilizer module.

5. Can I drive my vehicle with the U1193 code present?

- It is not recommended to drive the vehicle with the U1193 code triggered, as it may lead to potential starting or stalling issues while driving.

6. How much does it cost to repair the U1193 GMC code?

- The cost of repairing the U1193 code can vary depending on the exact cause of the issue, but it may range from a simple wiring repair to a more complex module replacement.

7. Will resetting the U1193 code make it go away permanently?

- Resetting the code may temporarily clear the error, but if the underlying issue causing the U1193 code is not addressed, it is likely to reappear.

8. Can a DIY enthusiast fix the U1193 GMC code?

- While some simple checks and repairs related to the U1193 code can be done by DIY enthusiasts, diagnosing and repairing complex issues may require professional help.

9. Is the U1193 code specific to GMC vehicles only?

- The U1193 code is a generic OBDII code related to loss of vehicle immobilizer module communications and can be found in various vehicle makes and models, not just GMC.

10. How can I prevent the U1193 code from occurring in the future?

- Regular maintenance checks, ensuring proper connections and wiring integrity, and addressing any immobilizer system issues promptly can help prevent the U1193 code from occurring.