OBD Guide
ENFRDEESPT

B27B6

Electric Compressor Internal Circuit

B27B6 is an OBD-II diagnostic trouble code meaning: Electric Compressor Internal Circuit. Common causes: failure of the built-in inverter of the compressor motor, turn-to-turn short circuit of electric motor windings. Estimated repair cost: $333–1333.

Severity
🔴 High
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$333–1333 (est.)

Symptoms

  • Air conditioning does not cool or does not work at all
  • Compressor does not turn on when requesting cooling
  • The air conditioning system fault indicator is on
  • On hybrids/electric vehicles - high voltage system warning
  • Extraneous noise from the compressor before it turns off

Causes

  • Failure of the built-in inverter of the compressor motor
  • Turn-to-turn short circuit of electric motor windings
  • Malfunction of power transistors (IGBT) of the inverter
  • Compressor high voltage circuit insulation failure
  • Mechanical jamming of the compressor

How to Fix

  1. Read climate control system and high voltage system error codes
  2. On hybrids/electric vehicles: de-energize the high-voltage system according to regulations
  3. Check the power and control signals at the compressor connector
  4. Measure the resistance of the motor windings (if accessible)
  5. Check the insulation of high-voltage compressor wires with a megohmmeter
  6. If an internal fault is confirmed, replace the electric compressor assembly

Related codes

B27B5B27B7B27C0P0A9A

FAQ

What does the B27B6 code mean?

B27B6 is an OBD-II diagnostic trouble code that indicates: Electric Compressor Internal Circuit

What causes a B27B6 error code?

The most common causes of B27B6 include: Failure of the built-in inverter of the compressor motor; Turn-to-turn short circuit of electric motor windings; Malfunction of power transistors (IGBT) of the inverter; Compressor high voltage circuit insulation failure.

How do I fix a B27B6 diagnostic trouble code?

To fix B27B6: Read climate control system and high voltage system error codes. On hybrids/electric vehicles: de-energize the high-voltage system according to regulations. Check the power and control signals at the compressor connector. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B27B6?

Yes, but get it checked soon

How much does it cost to fix B27B6?

The estimated repair cost for B27B6 is $333–1333. Actual cost depends on your vehicle, location, and labor rates.

FRDEESPT

See also: Russian version · NationStat