OBD Guide
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B2120

Door Passenger Set Switch Stuck Failure

B2120 is an OBD-II diagnostic trouble code meaning: Door Passenger Set Switch Stuck Failure. Common causes: switch sticking, open or shorted wiring harness. Estimated repair cost: $17–56.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$17–56 (est.)

Symptoms

  • Incorrect display of passenger door status
  • Door-related automatic functions do not work
  • False alarms

Causes

  • Switch sticking
  • Open or shorted wiring harness
  • Contact corrosion
  • Control unit malfunction

How to Fix

  1. Check the door switch for sticking
  2. Inspect the wiring harness for damage
  3. Clean switch contacts
  4. Replace switch if necessary

Related codes

B2121B2122

FAQ

What does the B2120 code mean?

B2120 is an OBD-II diagnostic trouble code that indicates: Door Passenger Set Switch Stuck Failure

What causes a B2120 error code?

The most common causes of B2120 include: Switch sticking; Open or shorted wiring harness; Contact corrosion; Control unit malfunction.

How do I fix a B2120 diagnostic trouble code?

To fix B2120: Check the door switch for sticking. Inspect the wiring harness for damage. Clean switch contacts. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B2120?

Limited driving only, diagnose soon

How much does it cost to fix B2120?

The estimated repair cost for B2120 is $17–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat