OBD Guide
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B120B

Passenger Seat Back Temperature Sensor

B120B is an OBD-II diagnostic trouble code meaning: Passenger Seat Back Temperature Sensor. Common causes: broken or damaged wiring, short circuit in the sensor circuit. Estimated repair cost: $33–89.

Severity
✅ Low
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$33–89 (est.)

Symptoms

  • Incorrect operation of the seat heating
  • Disabling the heating function
  • Error message on the dashboard

Causes

  • Broken or damaged wiring
  • Short circuit in the sensor circuit
  • Malfunction of the temperature sensor itself
  • Problems with the climate control system controller

How to Fix

  1. Check the integrity of the wiring and connectors
  2. Measure the sensor resistance (compare with standardized values)
  3. Replace sensor if necessary
  4. Check the functionality of the climate control system controller

Related codes

B120AB120CB120D

FAQ

What does the B120B code mean?

B120B is an OBD-II diagnostic trouble code that indicates: Passenger Seat Back Temperature Sensor

What causes a B120B error code?

The most common causes of B120B include: Broken or damaged wiring; Short circuit in the sensor circuit; Malfunction of the temperature sensor itself; Problems with the climate control system controller.

How do I fix a B120B diagnostic trouble code?

To fix B120B: Check the integrity of the wiring and connectors. Measure the sensor resistance (compare with standardized values). Replace sensor if necessary. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B120B?

Limited driving only, diagnose soon

How much does it cost to fix B120B?

The estimated repair cost for B120B is $33–89. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat