B27B4
Electric Compressor Low Voltage System
B27B4 is an OBD-II diagnostic trouble code meaning: Electric Compressor Low Voltage System. Common causes: electric compressor malfunction, problems with wiring or harness. Estimated repair cost: $56–167.
Symptoms
- Climate control does not work
- Increased engine temperature
- Check Engine light comes on
- Reduced cooling system efficiency
Causes
- Electric compressor malfunction
- Problems with wiring or harness
- Faulty relay or fuse
- Low battery voltage
- Problems with the control unit
How to Fix
- Check the voltage at the compressor terminals
- Inspect the wiring and wiring harness for damage
- Check relays and fuses
- Test the compressor operation
- If necessary, replace the compressor or wiring
Related codes
FAQ
What does the B27B4 code mean?
B27B4 is an OBD-II diagnostic trouble code that indicates: Electric Compressor Low Voltage System
What causes a B27B4 error code?
The most common causes of B27B4 include: Electric compressor malfunction; Problems with wiring or harness; Faulty relay or fuse; Low battery voltage.
How do I fix a B27B4 diagnostic trouble code?
To fix B27B4: Check the voltage at the compressor terminals. Inspect the wiring and wiring harness for damage. Check relays and fuses. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with B27B4?
Limited driving only, diagnose soon
How much does it cost to fix B27B4?
The estimated repair cost for B27B4 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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