OBD Guide
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B2381

Heater Coolant Temperature Sensor Circuit Open

B2381 is an OBD-II diagnostic trouble code meaning: Heater Coolant Temperature Sensor Circuit Open. Common causes: sensor harness wire break, malfunction of the temperature sensor itself. Estimated repair cost: $33–111.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$33–111 (est.)

Symptoms

  • Incorrect heater operation
  • Climate control malfunction
  • Hot or cold air without adjustment
  • Check Engine Signal on Dashboard

Causes

  • Sensor harness wire break
  • Malfunction of the temperature sensor itself
  • Poor contact in the sensor connector
  • Short circuit in the circuit
  • Problems with the climate control unit

How to Fix

  1. Diagnose the sensor circuit using a multimeter
  2. Check the sensor connector for corrosion and damage.
  3. Replace the heater coolant temperature sensor if necessary
  4. Repair open or short circuit in wiring harness
  5. Reset the error using an OBD-II scanner

Related codes

P0115P0116P0117P0118

FAQ

What does the B2381 code mean?

B2381 is an OBD-II diagnostic trouble code that indicates: Heater Coolant Temperature Sensor Circuit Open

What causes a B2381 error code?

The most common causes of B2381 include: Sensor harness wire break; Malfunction of the temperature sensor itself; Poor contact in the sensor connector; Short circuit in the circuit.

How do I fix a B2381 diagnostic trouble code?

To fix B2381: Diagnose the sensor circuit using a multimeter. Check the sensor connector for corrosion and damage.. Replace the heater coolant temperature sensor if necessary. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B2381?

Limited driving only, diagnose soon

How much does it cost to fix B2381?

The estimated repair cost for B2381 is $33–111. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat