OBD Guide
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B27A5

Open In Front Floor Electrical Key Oscillator Circuit

B27A5 is an OBD-II diagnostic trouble code meaning: Open In Front Floor Electrical Key Oscillator Circuit. Common causes: broken wire in the wiring harness, malfunction of the electronic key (oscillator). Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$56–167 (est.)

Symptoms

  • Inability to start the engine
  • The security system malfunction indicator is on
  • Immobilizer problems

Causes

  • Broken wire in the wiring harness
  • Malfunction of the electronic key (oscillator)
  • Problems with the immobilizer control unit
  • Short circuit in the circuit

How to Fix

  1. Check the wiring harness for breaks or damage
  2. Check the functionality of the electronic key (oscillator)
  3. Check the immobilizer control unit
  4. Replace damaged components

Related codes

B27A6B27A7B2795

FAQ

What does the B27A5 code mean?

B27A5 is an OBD-II diagnostic trouble code that indicates: Open In Front Floor Electrical Key Oscillator Circuit

What causes a B27A5 error code?

The most common causes of B27A5 include: Broken wire in the wiring harness; Malfunction of the electronic key (oscillator); Problems with the immobilizer control unit; Short circuit in the circuit.

How do I fix a B27A5 diagnostic trouble code?

To fix B27A5: Check the wiring harness for breaks or damage. Check the functionality of the electronic key (oscillator). Check the immobilizer control unit. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B27A5?

Do not drive — repair immediately

How much does it cost to fix B27A5?

The estimated repair cost for B27A5 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat