OBD Guide
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B27B3

Electric Compressor Internal Communication

B27B3 is an OBD-II diagnostic trouble code meaning: Electric Compressor Internal Communication. Common causes: damaged compressor wiring harness, compressor electronic module malfunction. Estimated repair cost: $167–556.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$167–556 (est.)

Symptoms

  • Reduced efficiency of the air conditioning system
  • Unstable compressor operation
  • Check Engine light comes on

Causes

  • Damaged compressor wiring harness
  • Compressor electronic module malfunction
  • Power or grounding problems
  • Software error in control module

How to Fix

  1. Check the compressor wiring harness and connectors for damage.
  2. Check power supply and grounding of the compressor
  3. Scan the control module for errors
  4. Replace the electric compressor if necessary

Related codes

B27B4B27B5P0532

FAQ

What does the B27B3 code mean?

B27B3 is an OBD-II diagnostic trouble code that indicates: Electric Compressor Internal Communication

What causes a B27B3 error code?

The most common causes of B27B3 include: Damaged compressor wiring harness; Compressor electronic module malfunction; Power or grounding problems; Software error in control module.

How do I fix a B27B3 diagnostic trouble code?

To fix B27B3: Check the compressor wiring harness and connectors for damage.. Check power supply and grounding of the compressor. Scan the control module for errors. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B27B3?

Limited driving only, diagnose soon

How much does it cost to fix B27B3?

The estimated repair cost for B27B3 is $167–556. Actual cost depends on your vehicle, location, and labor rates.

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