B1354: Ignition Key-In Circuit Short To Ground

What does B1354 mean?

B1354 is a diagnostic trouble code indicating "Ignition Key-In Circuit Short To Ground". The ECU is detecting a voltage reading that is below the expected range in the security & immobiliser circuit. This typically points to a wiring short, a faulty sensor, or a grounding issue.

Symptoms you may notice

• Check engine light (MIL) illuminated on dashboard
• Intermittent warning lights
• Erratic gauge readings

Common causes

• Damaged or corroded wiring harness
• Loose or disconnected electrical connector
• Failed security & immobiliser sensor or actuator
• Blown fuse in the related circuit
• Poor ground connection

What should you do?

This code sits in the immobiliser or vehicle security system. Braking and steering are not affected, but the car may refuse to start or strand you somewhere inconvenient. Plan the repair rather than rushing it.