OBD Guide
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B278A

Short to GND in Immobiliser System Power Source Circuit

B278A is an OBD-II diagnostic trouble code meaning: Short to GND in Immobiliser System Power Source Circuit. Common causes: wiring harness damage, immobilizer malfunction. Estimated repair cost: $56–167.

Severity
🔴 High
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Engine won't start
  • The immobilizer indicator is on
  • The engine stalls while driving

Causes

  • Wiring harness damage
  • Immobilizer malfunction
  • Short circuit to ground
  • Problems with immobilizer power supply

How to Fix

  1. Check wiring harness for damage
  2. Check the integrity of the immobilizer power supply circuit
  3. Check the serviceability of the immobilizer
  4. Replace damaged components

Related codes

B278BB278CP0510

FAQ

What does the B278A code mean?

B278A is an OBD-II diagnostic trouble code that indicates: Short to GND in Immobiliser System Power Source Circuit

What causes a B278A error code?

The most common causes of B278A include: Wiring harness damage; Immobilizer malfunction; Short circuit to ground; Problems with immobilizer power supply.

How do I fix a B278A diagnostic trouble code?

To fix B278A: Check wiring harness for damage. Check the integrity of the immobilizer power supply circuit. Check the serviceability of the immobilizer. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B278A?

Yes, but get it checked soon

How much does it cost to fix B278A?

The estimated repair cost for B278A is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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