OBD Guide
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B27BC

Electric Compressor Communication Error

B27BC is an OBD-II diagnostic trouble code meaning: Electric Compressor Communication Error. Common causes: open or short circuit in wiring harness, poor contact in connectors. Estimated repair cost: $56–333.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–333 (est.)

Symptoms

  • Air conditioning system failure
  • Reduced engine power (if it is a turbocharger compressor)
  • Illumination of the fault warning lamp (Check Engine)

Causes

  • Open or short circuit in wiring harness
  • Poor contact in connectors
  • Electric compressor malfunction
  • Problems with the control unit

How to Fix

  1. Check the integrity and connections of the wiring harness to the compressor
  2. Check connectors for corrosion and damage
  3. Check the power supply and ground of the compressor
  4. Scan the control unit for additional errors
  5. If necessary, replace the electric compressor

Related codes

B2795U0121U0155

FAQ

What does the B27BC code mean?

B27BC is an OBD-II diagnostic trouble code that indicates: Electric Compressor Communication Error

What causes a B27BC error code?

The most common causes of B27BC include: Open or short circuit in wiring harness; Poor contact in connectors; Electric compressor malfunction; Problems with the control unit.

How do I fix a B27BC diagnostic trouble code?

To fix B27BC: Check the integrity and connections of the wiring harness to the compressor. Check connectors for corrosion and damage. Check the power supply and ground of the compressor. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B27BC?

Limited driving only, diagnose soon

How much does it cost to fix B27BC?

The estimated repair cost for B27BC is $56–333. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat