OBD Guide
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B1221

Open In The Rear Mode Control Motor Circuit

B1221 is an OBD-II diagnostic trouble code meaning: Open In The Rear Mode Control Motor Circuit. Common causes: broken wiring harness, faulty solenoid or solenoid valve. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Approx. repair cost
$56–167 (est.)

Symptoms

  • Insufficient ventilation in the cabin
  • Air recirculation mode does not work
  • Noises from the ventilation system

Causes

  • Broken wiring harness
  • Faulty solenoid or solenoid valve
  • Problems with the actuator
  • Corrosion of connectors

How to Fix

  1. Check the integrity of the wiring harness
  2. Check solenoid operation
  3. Inspect connectors for corrosion
  4. Replace faulty actuator

Related codes

B1220B1222B1210

FAQ

What does the B1221 code mean?

B1221 is an OBD-II diagnostic trouble code that indicates: Open In The Rear Mode Control Motor Circuit

What causes a B1221 error code?

The most common causes of B1221 include: Broken wiring harness; Faulty solenoid or solenoid valve; Problems with the actuator; Corrosion of connectors.

How do I fix a B1221 diagnostic trouble code?

To fix B1221: Check the integrity of the wiring harness. Check solenoid operation. Inspect connectors for corrosion. For a complete diagnosis, use an OBD-II scanner.

How much does it cost to fix B1221?

The estimated repair cost for B1221 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat