OBD Guide
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B2621

Inside Key Antenna 1 Circuit

B2621 is an OBD-II diagnostic trouble code meaning: Inside Key Antenna 1 Circuit. Common causes: broken or damaged antenna wires, key antenna malfunction. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • The car does not respond to the key
  • Problems starting the engine
  • The keyless entry system is unstable

Causes

  • Broken or damaged antenna wires
  • Key antenna malfunction
  • Problems with the control module
  • Weak key battery
  • Interference from other electronic devices

How to Fix

  1. Check the key battery and replace if necessary
  2. Inspect the antenna wires and connectors for damage
  3. Check the antenna using diagnostic equipment
  4. Replace the antenna or control module if necessary

Related codes

B2622B2620

FAQ

What does the B2621 code mean?

B2621 is an OBD-II diagnostic trouble code that indicates: Inside Key Antenna 1 Circuit

What causes a B2621 error code?

The most common causes of B2621 include: Broken or damaged antenna wires; Key antenna malfunction; Problems with the control module; Weak key battery.

How do I fix a B2621 diagnostic trouble code?

To fix B2621: Check the key battery and replace if necessary. Inspect the antenna wires and connectors for damage. Check the antenna using diagnostic equipment. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B2621?

Limited driving only, diagnose soon

How much does it cost to fix B2621?

The estimated repair cost for B2621 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat