OBD Guide
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B1428

Ignition Switched Power Run/Crank Relay Circuit

B1428 is an OBD-II diagnostic trouble code meaning: Ignition Switched Power Run/Crank Relay Circuit. Common causes: faulty ignition relay, open or short circuit in wiring harness. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Engine won't start
  • Problems starting the engine
  • Unstable engine operation
  • Check Engine Light Is On

Causes

  • Faulty ignition relay
  • Open or short circuit in wiring harness
  • Poor contact in connectors
  • Engine control unit (ECU) malfunction

How to Fix

  1. Check the ignition relay for damage
  2. Inspect the wiring harness for breaks or damage
  3. Check the contacts in the circuit connectors
  4. Test the operation of the engine control unit (ECU)
  5. Replace faulty components

Related codes

B1427B1429P0685

FAQ

What does the B1428 code mean?

B1428 is an OBD-II diagnostic trouble code that indicates: Ignition Switched Power Run/Crank Relay Circuit

What causes a B1428 error code?

The most common causes of B1428 include: Faulty ignition relay; Open or short circuit in wiring harness; Poor contact in connectors; Engine control unit (ECU) malfunction.

How do I fix a B1428 diagnostic trouble code?

To fix B1428: Check the ignition relay for damage. Inspect the wiring harness for breaks or damage. Check the contacts in the circuit connectors. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1428?

Limited driving only, diagnose soon

How much does it cost to fix B1428?

The estimated repair cost for B1428 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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