OBD Guide
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B27C8

Compressor Suction Refrigerant Temperature Sensor Low

B27C8 is an OBD-II diagnostic trouble code meaning: Compressor Suction Refrigerant Temperature Sensor Low. Common causes: refrigerant temperature sensor malfunction (open or shorted), short circuit of the sensor signal wire to ground. Estimated repair cost: $11–222.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$11–222 (est.)

Symptoms

  • The air conditioner is not cooling or is not working efficiently
  • The compressor switches off periodically during operation
  • The air conditioning system fault indicator is on
  • Code B27C8 when diagnosing the climate control unit

Causes

  • Refrigerant temperature sensor malfunction (open or shorted)
  • Short circuit of the sensor signal wire to ground
  • Break in the power wire (+5 V) of the sensor
  • Refrigerant leak causing extremely low suction temperature
  • Expansion valve malfunction (refrigerant undercooling)

How to Fix

  1. Read air conditioning system error codes
  2. Check the voltage of the sensor signal wire (normal: 0.5–4.5 V at operating temperature)
  3. Check the presence of power (+5 V) on the sensor
  4. Check sensor resistance and compare with temperature/resistance table
  5. Check the pressure in the air conditioning system (low pressure may indicate a freon leak)
  6. If the sensor is faulty, replace it; if there is a leak, fix it and refill the system

Related codes

B27C7B27C9B27CAP0532

FAQ

What does the B27C8 code mean?

B27C8 is an OBD-II diagnostic trouble code that indicates: Compressor Suction Refrigerant Temperature Sensor Low

What causes a B27C8 error code?

The most common causes of B27C8 include: Refrigerant temperature sensor malfunction (open or shorted); Short circuit of the sensor signal wire to ground; Break in the power wire (+5 V) of the sensor; Refrigerant leak causing extremely low suction temperature.

How do I fix a B27C8 diagnostic trouble code?

To fix B27C8: Read air conditioning system error codes. Check the voltage of the sensor signal wire (normal: 0.5–4.5 V at operating temperature). Check the presence of power (+5 V) on the sensor. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B27C8?

Yes, but get it checked soon

How much does it cost to fix B27C8?

The estimated repair cost for B27C8 is $11–222. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat