OBD Guide
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B1B84

Passenger Seat Weight Sensor 2 Left Rear Input Circuit High

B1B84 is an OBD-II diagnostic trouble code meaning: Passenger Seat Weight Sensor 2 Left Rear Input Circuit High. Common causes: short circuit in the sensor circuit, load sensor malfunction. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$56–167 (est.)

Symptoms

  • The security system malfunction indicator is on
  • Incorrect operation of the airbag
  • Incorrect determination of passenger weight

Causes

  • Short circuit in the sensor circuit
  • Load sensor malfunction
  • Wiring harness damage
  • Connection problems or contact corrosion

How to Fix

  1. Check the integrity of the wiring harness
  2. Check the connections and contacts of the sensor
  3. Test the weight sensor
  4. Replace a faulty sensor or restore the circuit

Related codes

B1B83B1B85B1B86

FAQ

What does the B1B84 code mean?

B1B84 is an OBD-II diagnostic trouble code that indicates: Passenger Seat Weight Sensor 2 Left Rear Input Circuit High

What causes a B1B84 error code?

The most common causes of B1B84 include: Short circuit in the sensor circuit; Load sensor malfunction; Wiring harness damage; Connection problems or contact corrosion.

How do I fix a B1B84 diagnostic trouble code?

To fix B1B84: Check the integrity of the wiring harness. Check the connections and contacts of the sensor. Test the weight sensor. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1B84?

Do not drive — repair immediately

How much does it cost to fix B1B84?

The estimated repair cost for B1B84 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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