OBD Guide
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B27A4

Open in Passengers Side Rear Door Electrical Antenna Circuit

B27A4 is an OBD-II diagnostic trouble code meaning: Open in Passengers Side Rear Door Electrical Antenna Circuit. Common causes: broken antenna wire in the rear passenger door hinge, faulty or damaged lf antenna in the door. Estimated repair cost: $22–167.

Severity
✅ Low
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$22–167 (est.)

Symptoms

  • Keyless entry does not work on rear passenger side
  • The door does not unlock automatically when approaching with the key
  • The remaining doors can operate normally
  • The keyless entry system fault indicator is on

Causes

  • Broken antenna wire in the rear passenger door hinge
  • Faulty or damaged LF antenna in the door
  • Oxidation or damage to the antenna connector
  • Malfunction of the PKE system control unit
  • Mechanical damage to the antenna module due to a door impact

How to Fix

  1. Read keyless entry system error codes
  2. Inspect the wiring harness in the rear passenger door hinge for breaks or damage.
  3. Check the antenna module connector for oxidation and secure fastening
  4. Measure the resistance of the antenna circuit (the norm depends on the specific antenna)
  5. If the wiring is broken, restore the harness or replace the door hinge
  6. If the antenna is faulty, replace the antenna module

Related codes

B27A3B27A5B27A6B2700

FAQ

What does the B27A4 code mean?

B27A4 is an OBD-II diagnostic trouble code that indicates: Open in Passengers Side Rear Door Electrical Antenna Circuit

What causes a B27A4 error code?

The most common causes of B27A4 include: Broken antenna wire in the rear passenger door hinge; Faulty or damaged LF antenna in the door; Oxidation or damage to the antenna connector; Malfunction of the PKE system control unit.

How do I fix a B27A4 diagnostic trouble code?

To fix B27A4: Read keyless entry system error codes. Inspect the wiring harness in the rear passenger door hinge for breaks or damage.. Check the antenna module connector for oxidation and secure fastening. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B27A4?

Yes, but get it checked soon

How much does it cost to fix B27A4?

The estimated repair cost for B27A4 is $22–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat