AutoCodes – Generic – P1393

P1393 Code - Glow Plug Circuit Low 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: P1393 indicates Glow Plug Circuit Low 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.

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Code Popularity 16,720

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
Cost to Diagnose
FAQs
Comments
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Code P1393 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 P1393 - Glow Plug Circuit Low Input Bank 2 - AutoCodes.com — P1393 Code - Glow Plug Circuit Low Input Bank 2

What does this mean?

What are the Possible Causes of the DTC P1393?

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 P1393?

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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1393 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 P1393 code?

Need more information on how to fix the P1393 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1393 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1393 Acura — G-Sensor Voltage High
P1393 Audi — Ignition Coil Power Output Stage 1 Malfunction
P1393 Buick — Wheel Speed Sensor 1 G-Sensor Circuit High Voltage
P1393 Cadillac — Wheel Speed Sensor 1 G-Sensor Circuit High Voltage
P1393 Chevrolet — Wheel Speed Sensor 1 G-Sensor Circuit High Voltage
P1393 Ford — Glow Plug Circuit Low Input Bank 2
P1393 GMC — Wheel Speed Sensor 1 G-Sensor Circuit High Voltage
P1393 Honda — G-Sensor Voltage High
P1393 Isuzu — G-Sensor Circuit High Voltage
P1393 Saab — Cylinder 3 Misfire Detected Random Fuel Level Low
P1393 Suzuki — G-Sensor Voltage High Rough road sensor
P1393 Volkswagen — Ignition Coil Power Output Stage 1 Malfunction

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.

Frequently Asked Questions about P1393 Code

1. What are the common symptoms of OBDII code P1393 (Glow Plug Circuit Low Input Bank 2)?

- Common symptoms include hard starting, rough idling, decreased fuel efficiency, and possible illumination of the Check Engine Light.

2. What are the possible causes of OBDII code P1393?

- The code P1393 can be triggered by issues such as faulty glow plugs, damaged wiring or connectors in the glow plug circuit, or a defective glow plug control module.

3. How can I diagnose the cause of OBDII code P1393?

- To diagnose the issue, you can use a scan tool to check for any additional codes stored in the system, visually inspect the glow plug circuit for damage, and perform electrical tests on the glow plug system components.

4. Can I drive my vehicle with OBDII code P1393?

- It is not recommended to drive your vehicle with the P1393 code as it can lead to poor engine performance and potential damage if left unresolved.

5. How can I repair OBDII code P1393?

- Repairing the P1393 code may involve replacing faulty glow plugs, repairing damaged wiring or connectors, or replacing the glow plug control module as needed.

6. Are there any tips to prevent OBDII code P1393 from occurring again?

- Regularly inspecting and maintaining the glow plug system, using high-quality glow plugs, and ensuring proper electrical connections can help prevent the recurrence of the P1393 code.

7. Can a DIY enthusiast fix OBDII code P1393 at home?

- Depending on your skill level and access to tools, a DIY enthusiast may be able to address the P1393 code by following repair guides and utilizing the necessary equipment.

8. How long does it typically take to repair OBDII code P1393?

- The repair time for the P1393 code varies depending on the exact cause of the issue, but it can usually be resolved within a few hours to a day at a repair shop.

9. Will resetting the Check Engine Light resolve OBDII code P1393?

- Simply resetting the Check Engine Light without addressing the underlying issue causing the P1393 code will not solve the problem; it is crucial to diagnose and repair the root cause.

10. Is it safe to clear the OBDII code P1393 and continue driving without fixing it?

- While clearing the code may temporarily turn off the Check Engine Light, it is not recommended to ignore the underlying issue as it can lead to further engine problems and potential safety hazards.