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AutoCodes – Generic – U1003

U1003 Code - Lost Communication With VVEL Control Module

Quick Answer

The Controller Area Network (CAN) is a serial communication line for real-time applications. Common causes include Faulty Variable Valve Event & Lift (VVEL) Control Module, VVEL Control Module harness is open or shorted, VVEL 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
U1003 indicates Lost Communication With VVEL Control Module.
Common causes
Common causes include Faulty Variable Valve Event & Lift (VVEL) Control Module, VVEL Control Module harness is open or shorted, VVEL 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 31,451
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Apr 15, 2020
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Code U1003 Description

The Controller Area Network (CAN) is a serial communication line for real-time applications. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Engine Control Module (ECM) and Variable Valve Event & Lift (VVEL) control module are connected with two communication lines (CAN H line and CAN L line) and transmit/receive data. ECM shares information and links with the VVEL control module during operation.
The Diagnostic Trouble Code (DTC) sets when a CAN communication signal other than OBD (emission-related diagnosis) is not received between Variable Valve Event & Lift (VVEL) control module and Engine Control Module (ECM) for 2 seconds or more.
OBDII Code U1003 - Lost Communication With VVEL Control Module - AutoCodes.com
U1003 Code - Lost Communication With VVEL Control Module
What does this mean?

What are the Possible Causes of the DTC U1003?

  • Faulty Variable Valve Event & Lift (VVEL) Control Module
  • VVEL Control Module harness is open or shorted
  • VVEL Control Module circuit poor electrical connection
  • Faulty Engine Control Module (ECM)

How to Fix the DTC U1003?

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 U1003 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.

Need more information about the U1003 code?

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Need Help with the Code?

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Information for Specific Makes

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 U1003 Code

No Frequently Asked Questions about U1003 Code found.

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  • I have a nissan patrol v8 model 2012 Japanese the vehicle is not going to start because this dtc is not erras u1003 and p1606

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