OBD Guide
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B27C9

Compressor Suction Refrigerant Temperature Sensor High

B27C9 is an OBD-II diagnostic trouble code meaning: Compressor Suction Refrigerant Temperature Sensor High. Common causes: refrigerant temperature sensor malfunction, open or short circuit in wiring harness. Estimated repair cost: $33–89.

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

Symptoms

  • Air conditioner doesn't work
  • Reduced cooling efficiency
  • Fault indication on the instrument panel

Causes

  • Refrigerant temperature sensor malfunction
  • Open or short circuit in wiring harness
  • Poor contact in the sensor connector
  • Malfunction of the climate control unit

How to Fix

  1. Check the resistance of the temperature sensor
  2. Inspect the wiring harness and connectors for damage.
  3. Check the power and ground of the sensor circuit
  4. If necessary, replace the sensor or repair the wiring

Related codes

B279AB279BB27CA

FAQ

What does the B27C9 code mean?

B27C9 is an OBD-II diagnostic trouble code that indicates: Compressor Suction Refrigerant Temperature Sensor High

What causes a B27C9 error code?

The most common causes of B27C9 include: Refrigerant temperature sensor malfunction; Open or short circuit in wiring harness; Poor contact in the sensor connector; Malfunction of the climate control unit.

How do I fix a B27C9 diagnostic trouble code?

To fix B27C9: Check the resistance of the temperature sensor. Inspect the wiring harness and connectors for damage.. Check the power and ground of the sensor circuit. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B27C9?

Limited driving only, diagnose soon

How much does it cost to fix B27C9?

The estimated repair cost for B27C9 is $33–89. Actual cost depends on your vehicle, location, and labor rates.

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