OBD Guide
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U1003

Lost Communication With VVEL Control Module

U1003 is an OBD-II diagnostic trouble code meaning: Lost Communication With VVEL Control Module. Common causes: open or short circuit in the can bus circuit, vvel control module malfunction. Estimated repair cost: $56–278.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–278 (est.)

Symptoms

  • Check Engine light comes on
  • Reduced engine power
  • Increased fuel consumption
  • Unstable idling
  • Engine speed limit

Causes

  • Open or short circuit in the CAN bus circuit
  • VVEL control module malfunction
  • VVEL module power supply problems
  • Corrosion of connector contacts
  • Software error in the ECU

How to Fix

  1. Check the integrity of the CAN bus wiring
  2. Check the power and ground of the VVEL module
  3. Inspect connectors for corrosion
  4. Scan VVEL module for errors
  5. If necessary, replace the VVEL module

Related codes

U1001U1002U1004

FAQ

What does the U1003 code mean?

U1003 is an OBD-II diagnostic trouble code that indicates: Lost Communication With VVEL Control Module

What causes a U1003 error code?

The most common causes of U1003 include: Open or short circuit in the CAN bus circuit; VVEL control module malfunction; VVEL module power supply problems; Corrosion of connector contacts.

How do I fix a U1003 diagnostic trouble code?

To fix U1003: Check the integrity of the CAN bus wiring. Check the power and ground of the VVEL module. Inspect connectors for corrosion. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U1003?

Limited driving only, diagnose soon

How much does it cost to fix U1003?

The estimated repair cost for U1003 is $56–278. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat