OBD Guide
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B221A

Heated Seat Module Internal

B221A is an OBD-II diagnostic trouble code meaning: Heated Seat Module Internal. Common causes: internal damage to the seat heating module, short circuit in the module circuit. Estimated repair cost: $56–167.

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

Symptoms

  • Heated seat doesn't work
  • Seat heating works constantly without adjustment
  • Seat heating turns on and off spontaneously
  • The malfunction indicator on the instrument panel lights up

Causes

  • Internal damage to the seat heating module
  • Short circuit in the module circuit
  • Open power or control circuit
  • Problems with the wiring harness connected to the module

How to Fix

  1. Check trouble codes using an OBD-II scanner
  2. Inspect the wiring harness and module connectors for damage.
  3. Check power supply and grounding of the module
  4. Test the seat heating module (if possible)
  5. Replace the seat heating module if the fault is confirmed

Related codes

B221BB221CB221D

FAQ

What does the B221A code mean?

B221A is an OBD-II diagnostic trouble code that indicates: Heated Seat Module Internal

What causes a B221A error code?

The most common causes of B221A include: Internal damage to the seat heating module; Short circuit in the module circuit; Open power or control circuit; Problems with the wiring harness connected to the module.

How do I fix a B221A diagnostic trouble code?

To fix B221A: Check trouble codes using an OBD-II scanner. Inspect the wiring harness and module connectors for damage.. Check power supply and grounding of the module. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B221A?

Limited driving only, diagnose soon

How much does it cost to fix B221A?

The estimated repair cost for B221A is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat