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Engine-Codes – Generic – U0168

U0168 Code - Lost Communication With Vehicle Security Control Module

Quick Answer

The U0168 code indicates that the vehicle's engine control module (ECM) has lost communication with the vehicle security control module. Common causes include Wiring or connection issues between ECM and security control module, Faulty security control module, Malfunctioning ECM. 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
U0168 indicates Lost Communication With Vehicle Security Control Module.
Common causes
Common causes include Wiring or connection issues between ECM and security control module, Faulty security control module, Malfunctioning ECM.
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 12, 2024
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Code U0168 Description

The U0168 code indicates that the vehicle's engine control module (ECM) has lost communication with the vehicle security control module. The vehicle security control module is responsible for managing the vehicle's security systems, such as the anti-theft system, keyless entry, and immobilizer. When communication is lost between the ECM and the security control module, it can lead to issues with starting the vehicle, as the immobilizer may prevent the engine from turning over.

OBDII Code U0168 - Lost Communication With Vehicle Security Control Module
U0168 Code - Lost Communication With Vehicle Security Control Module

Common Causes of U0168

  1. Wiring or connection issues between ECM and security control module
  2. Faulty security control module
  3. Malfunctioning ECM
  4. Corrosion or damage to wiring harness
  5. Software issues with security control module

Symptoms of U0168

  1. Engine cranks but does not start
  2. Security warning light illuminated on the dashboard
  3. Keyless entry system not functioning
  4. Anti-theft system activating unexpectedly
  5. Vehicle intermittently not recognizing key fob

How to Fix U0168

  1. Begin by checking the wiring and connections between the ECM and security control module for any signs of damage or corrosion. Repair or replace any faulty wiring.
  2. Test the security control module for proper functioning and replace if necessary.
  3. Check the ECM for any software updates or reprogramming needed to restore communication with the security control module.
  4. Clear the diagnostic trouble codes and perform a test drive to confirm the issue has been resolved.
  5. If the problem persists, consult a professional mechanic for further diagnosis and repair.

Cost to Fix U0168

The typical repair costs for addressing a U0168 code can vary depending on the specific cause of the communication loss. In general, parts and labor for this repair could range from $200 to $500. However, it's important to note that diagnosis time and labor rates at auto repair shops can vary significantly based on factors such as location, vehicle make and model, and engine type. It's advisable to check with local repair shops for a more accurate estimate.

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Code U0168 Information for Specific Makes

  • U0168 Buick — Lost Communication With Keyless Entry Control Module
  • U0168 Cadillac — Lost Communication With Keyless Entry Control Module
  • U0168 Chevrolet — Lost Communication With Keyless Entry Control Module
  • U0168 Chrysler — Lost Communication With Vehicle Security Control Module
  • U0168 Dodge — Lost Communication With Vehicle Security Control Module
  • U0168 GMC — Lost Communication With Keyless Entry Control Module
  • U0168 Jeep — Lost Communication With Vehicle Security Control Module
  • U0168 RAM — 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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