OBD Guide
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U12B7

Millimeter Wave Radar Local CAN Malfunction

U12B7 is an OBD-II diagnostic trouble code meaning: Millimeter Wave Radar Local CAN Malfunction. Common causes: broken or damaged can network wires, poor contact in radar connectors. Estimated repair cost: $167–556.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$167–556 (est.)

Symptoms

  • Disabling safety systems (adaptive cruise control, automatic braking)
  • The Check Engine Light or Safety System Warning Is On
  • Unstable operation of driver assistance systems
  • Errors in other related systems

Causes

  • Broken or damaged CAN network wires
  • Poor contact in radar connectors
  • Millimeter Radar Malfunction
  • Radar power problems
  • Corrosion or oxidation of contacts

How to Fix

  1. Check the integrity of the CAN network wiring
  2. Inspect and clean the radar connector contacts
  3. Check the power and ground of the radar
  4. Scan other modules for errors
  5. Repair only from an authorized dealer

Related codes

U12B6U12B8U0121

FAQ

What does the U12B7 code mean?

U12B7 is an OBD-II diagnostic trouble code that indicates: Millimeter Wave Radar Local CAN Malfunction

What causes a U12B7 error code?

The most common causes of U12B7 include: Broken or damaged CAN network wires; Poor contact in radar connectors; Millimeter Radar Malfunction; Radar power problems.

How do I fix a U12B7 diagnostic trouble code?

To fix U12B7: Check the integrity of the CAN network wiring. Inspect and clean the radar connector contacts. Check the power and ground of the radar. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U12B7?

Do not drive — repair immediately

How much does it cost to fix U12B7?

The estimated repair cost for U12B7 is $167–556. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat