OBD Guide
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U12B5

CAN Communication Failure With VSA

U12B5 is an OBD-II diagnostic trouble code meaning: CAN Communication Failure With VSA. Common causes: open or short circuit in can circuit, poor contact in module connectors. Estimated repair cost: $17–111.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$17–111 (est.)

Symptoms

  • Check Engine Light Is On
  • Stabilization system (VSA) does not work
  • Other electronic systems may fail
  • Possible engine or transmission problems
  • Other warnings appear on the dashboard

Causes

  • Open or short circuit in CAN circuit
  • Poor contact in module connectors
  • VSA module failure
  • Wiring harness damage
  • Problems with power supply to CAN modules

How to Fix

  1. Check the integrity of the CAN wires
  2. Inspect and clean all connectors
  3. Check power supply of CAN modules
  4. Perform diagnostics on the VSA module
  5. Replace damaged components if necessary

Related codes

U0001U0100U0121U0155

FAQ

What does the U12B5 code mean?

U12B5 is an OBD-II diagnostic trouble code that indicates: CAN Communication Failure With VSA

What causes a U12B5 error code?

The most common causes of U12B5 include: Open or short circuit in CAN circuit; Poor contact in module connectors; VSA module failure; Wiring harness damage.

How do I fix a U12B5 diagnostic trouble code?

To fix U12B5: Check the integrity of the CAN wires. Inspect and clean all connectors. Check power supply of CAN modules. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U12B5?

Do not drive — repair immediately

How much does it cost to fix U12B5?

The estimated repair cost for U12B5 is $17–111. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat