OBD Guide
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U18B7

Lost Communication With Active Safety Control Module 2 On Chassis Expansion CAN Bus

U18B7 is an OBD-II diagnostic trouble code meaning: Lost Communication With Active Safety Control Module 2 On Chassis Expansion CAN Bus. Common causes: open or short circuit in can circuit, oxidation of connector contacts. Estimated repair cost: $56–222.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$56–222 (est.)

Symptoms

  • The malfunction indicator light comes on
  • Disabling active safety systems
  • Loss of stabilization and assistant functions
  • Possible warnings on the instrument panel

Causes

  • Open or short circuit in CAN circuit
  • Oxidation of connector contacts
  • Active safety module malfunction
  • Module power problems
  • Module software failure

How to Fix

  1. Check the integrity of the CAN bus wiring harness
  2. Inspect and clean connector contacts
  3. Check fuses and module power supply
  4. Scan other modules for communication errors
  5. Repair only from an authorized dealer

Related codes

U18A7U18C7U18D7

FAQ

What does the U18B7 code mean?

U18B7 is an OBD-II diagnostic trouble code that indicates: Lost Communication With Active Safety Control Module 2 On Chassis Expansion CAN Bus

What causes a U18B7 error code?

The most common causes of U18B7 include: Open or short circuit in CAN circuit; Oxidation of connector contacts; Active safety module malfunction; Module power problems.

How do I fix a U18B7 diagnostic trouble code?

To fix U18B7: Check the integrity of the CAN bus wiring harness. Inspect and clean connector contacts. Check fuses and module power supply. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U18B7?

Do not drive — repair immediately

How much does it cost to fix U18B7?

The estimated repair cost for U18B7 is $56–222. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat