P1394 Glow Plug Circuit High Input Bank 2

Category: Powertrain - Fuel/Air Metering
Severity: Check Engine Light
Applies to: F-250/F-350 Super Duty diesel

What does P1394 mean on a Ford?

P1394 — Glow Plug Circuit High Input Bank 2. This Ford-enhanced code applies to F-250/F-350 Super Duty diesel.

Common causes of P1394

Shorted bank 2 circuit
Failed plug with internal short
Chafed harness
Stuck relay
Controller fault

How to fix P1394

Locate the short in bank 2 wiring
Test plugs individually
Check harness chafing
Verify relay operation
Repair or replace per findings