AutoCodes – Chevrolet – U1193 Chevrolet

U1193 Chevrolet 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 Chevrolet 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 4,795

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

What does this mean?

What are the Possible Causes of the DTC U1193 Chevrolet?

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 Chevrolet?

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 Chevrolet 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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Need more information on how to fix the U1193 Chevrolet code? Get Access to Factory Service Manuals

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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 Chevrolet Code

1. What does the OBDII code U1193 mean for a Chevrolet vehicle?

U1193 indicates a "Loss of Vehicle Immobilizer Module Communications," meaning the Immobilizer Module is not communicating properly with the vehicle's main control systems.

2. What are the common symptoms of the U1193 code in a Chevrolet?

Symptoms include difficulty starting the vehicle, the security light staying on or flashing, and intermittent stalling.

3. What causes the U1193 code to appear in a Chevrolet?

The most common causes are a faulty immobilizer module, wiring issues like loose or damaged connections, or software glitches in the control module.

4. Can a weak or dead battery trigger the U1193 code?

Yes, a weak or dead battery can interrupt communication between the immobilizer and other modules, potentially triggering this code.

5. How do you diagnose the U1193 code on a Chevrolet?

Diagnosis involves scanning for additional codes, inspecting immobilizer module wiring and connectors, and testing the module for power and proper communication.

6. Is the U1193 code related to key fob or transponder issues?

Yes, if the transponder in the key or the key fob isnâ€™t detected correctly by the immobilizer, it can result in a loss of communication and trigger the U1193 code.

7. Can a faulty ECM cause the U1193 code in a Chevrolet?

While rare, a faulty Engine Control Module (ECM) could potentially disrupt communication with the immobilizer module.

8. How is the U1193 code typically fixed in a Chevrolet?

Repairs may include replacing or reprogramming the immobilizer module, repairing damaged wiring, or reprogramming the vehicleâ€™s key fob or transponder.

9. How much does it cost to fix the U1193 code on a Chevrolet?

Repair costs vary but may range from $100 to $500, depending on whether the issue involves wiring repairs, reprogramming, or module replacement.

10. Can I still drive my Chevrolet with the U1193 code active?

Driving may not be possible if the vehicle fails to start due to the immobilizer issue. Even if it starts, itâ€™s best to address the problem promptly to avoid further complications.