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Engine-Codes – Generic – U0327

U0327 Code - Lost Communication with Vehicle Security Control Module

Quick Answer

The U0327 code indicates that the vehicle's onboard computer has lost communication with the Vehicle Security Control Module (VSCM). Common causes include Faulty wiring or connections, Malfunctioning VSCM, Issues with the vehicle's main computer system. 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
U0327 indicates Lost Communication with Vehicle Security Control Module.
Common causes
Common causes include Faulty wiring or connections, Malfunctioning VSCM, Issues with the vehicle's main computer system.
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 10, 2024
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Code U0327 Description

The U0327 code indicates that the vehicle's onboard computer has lost communication with the Vehicle Security Control Module (VSCM). The VSCM is responsible for managing the security features of the vehicle, such as the alarm system, immobilizer, and keyless entry. When communication with the VSCM is lost, it can lead to a variety of issues related to the security and overall performance of the vehicle.

OBDII Code U0327 - Lost Communication with Vehicle Security Control Module
U0327 Code - Lost Communication with Vehicle Security Control Module

Common Causes of U0327

  1. Faulty wiring or connections
  2. Malfunctioning VSCM
  3. Issues with the vehicle's main computer system
  4. Water damage or corrosion in the electrical system
  5. Faulty sensors or components related to the security system

Symptoms of U0327

  1. Difficulty starting the vehicle
  2. Alarm system malfunctions
  3. Keyless entry system not working
  4. Vehicle going into "limp mode"
  5. Security warning lights on the dashboard

How to Fix U0327

  1. Perform a thorough inspection of the wiring and connections related to the VSCM to check for any damage or loose connections.
  2. Test the VSCM to determine if it is functioning properly or needs to be replaced.
  3. Check the vehicle's main computer system for any faults or errors that may be causing the communication issue.
  4. Inspect for any water damage or corrosion in the electrical system, which may be affecting the communication between the modules.
  5. Replace any faulty sensors or components related to the security system that may be contributing to the issue.

Cost to Fix U0327

The typical repair costs for resolving the U0327 code can vary depending on the specific cause of the communication loss. On average, the repair costs for this issue can range from $200 to $500, including parts and labor. However, it's important to note that the actual cost may be higher or lower depending on factors such as location, vehicle make and model, and the extent of the repairs needed. It's recommended to consult with a professional mechanic to get an accurate estimate based on the specific circumstances of your vehicle.

What does this mean?

Tech Notes for U0327

When there are problems with the way different systems in a vehicle communicate with each other using a technology called Controller Area Network (CAN) communication, Diagnostic Trouble Codes (DTC) are displayed. These codes can be caused by issues with the main bus or branch of the communication network, or with the Electronic Control Units (ECUs) and sensors that make up the different systems. If you see code for both the CAN communication problems and internal or power source problems at the same time, you should focus on fixing the internal or power source problems first.

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Code U0327 Information for Specific Makes

  • U0327 Lexus — Lost Communication with Vehicle Security Control Module
  • U0327 Toyota — Lost Communication with Vehicle Security Control Module
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.

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