AutoCodes – Ford – P1394 Ford

P1394 Ford Code - Glow Plug Circuit High Input Bank 2

Quick Answer

The glow plug system is monitored when the glow plugs are commanded on for more than 35 seconds and battery voltage is between 11.5-14 volts. Common causes include Faulty glow plug relay, Faulty glow plug shunt, Faulty glow plugs. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P1394 Ford indicates Glow Plug Circuit High Input Bank 2.
Common causes: Common causes include Faulty glow plug relay, Faulty glow plug shunt, Faulty glow plugs.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 4,434

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 17, 2019

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P1394 Ford Description

The glow plug system is monitored when the glow plugs are commanded on for more than 35 seconds and battery voltage is between 11.5-14 volts.

OBDII Code P1394 Ford - Glow Plug Circuit High Input Bank 2 - AutoCodes.com — P1394 Ford Code - Glow Plug Circuit High Input Bank 2

What does this mean?

What are the Possible Causes of the DTC P1394 Ford?

Faulty glow plug relay
Faulty glow plug shunt
Faulty glow plugs
Glow plugs harness is open or shorted
Glow plugs circuit poor electrical connection
Faulty Powertrain Control Module (PCM)

How to Fix the DTC P1394 Ford?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

California trucks it has a GPCM (Glow Plug Control Module) instead of a GPR (Glow Plug Relay).

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1394 Ford code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P1394 Ford code?

Need more information on how to fix the P1394 Ford code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1394 Ford code diagnosed by a professional: Find a repair shop in your area

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.