AutoCodes – Volkswagen – P0381 Volkswagen

P0381 Volkswagen Code - Glow Plug/Heater Indicator Circuit Malfunction

Quick Answer

The glow plug system is used to assist in providing the heat required to begin combustion during cold engine temperatures. Common causes include Faulty Glow Plug, Glow Plug harness is open or shorted, Glow Plug circuit poor electrical connection. 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: P0381 Volkswagen indicates Glow Plug/Heater Indicator Circuit Malfunction.
Common causes: Common causes include Faulty Glow Plug, Glow Plug harness is open or shorted, Glow Plug circuit poor electrical connection.
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 11,613

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 Apr 16, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0381 Volkswagen Description

The glow plug system is used to assist in providing the heat required to begin combustion during cold engine temperatures. The glow plugs are heated before and during cranking, as well as initial engine operation. The Engine Control Module (ECM) controls the glow plug ON times by monitoring coolant temperature and glow plug voltage. The California Glow Plug system has eight individual glow plug supply circuits between the controller and the glow plugs. If the feedback voltage from the controller to the ECM is not within range, DTC P0380 will set.

OBDII Code P0381 Volkswagen - Glow Plug/Heater Indicator Circuit Malfunction - AutoCodes.com — P0381 Volkswagen Code - Glow Plug/Heater Indicator Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC P0381 Volkswagen?

Faulty Glow Plug
Glow Plug harness is open or shorted
Glow Plug circuit poor electrical connection

How to Fix the DTC P0381 Volkswagen?

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 P0381 Volkswagen 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.

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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 P0381 Volkswagen Code

1. What are the common symptoms of OBDII code P0381 in a Volkswagen related to the Glow Plug/Heater Indicator Circuit Malfunction?

- Common symptoms include difficulty starting the engine, rough idling, excessive smoke from the exhaust, and the glow plug indicator light staying on.

2. What are the possible causes of OBDII code P0381 in a Volkswagen?

- Possible causes include a faulty glow plug relay, damaged wiring or connectors in the glow plug circuit, a faulty glow plug control module, or a malfunctioning engine control module (ECM).

3. How can I diagnose the OBDII code P0381 in my Volkswagen?

- Diagnosis typically involves using a scan tool to read the code, checking the glow plug system's wiring and connections for any damage or corrosion, and testing the glow plugs themselves for proper function.

4. What should I do if I encounter OBDII code P0381 in my Volkswagen?

- It is recommended to address the issue promptly to avoid potential starting problems or engine performance issues. Consult a professional mechanic to accurately diagnose and repair the problem.

5. Can I continue driving my Volkswagen with OBDII code P0381 present?

- While the vehicle may still be drivable with this code, it is advisable to address the underlying issue promptly to prevent potential damage to the engine or starting difficulties.

6. Are there any DIY repair tips for fixing OBDII code P0381 in a Volkswagen?

- DIY repair tips may include checking and cleaning the glow plug system connections, ensuring proper voltage supply to the glow plugs, and replacing any faulty glow plugs or related components.

7. How much does it typically cost to repair OBDII code P0381 in a Volkswagen?

- Repair costs can vary depending on the specific cause of the issue and labor rates in your area. It is recommended to obtain quotes from reputable mechanics or repair shops.

8. Can extreme weather conditions affect the occurrence of OBDII code P0381 in a Volkswagen?

- Yes, extreme cold weather can put more strain on the glow plug system, potentially leading to issues with glow plug operation and triggering the P0381 code.

9. Is OBDII code P0381 specific to Volkswagen vehicles, or can it occur in other car brands?

- While this code is commonly associated with Volkswagen vehicles, similar glow plug circuit malfunctions can occur in other car brands equipped with diesel engines.

10. How often should I replace the glow plugs in my Volkswagen to prevent OBDII code P0381 from appearing?

- Glow plug replacement intervals can vary depending on the vehicle's mileage and usage. It is advisable to follow the manufacturer's recommendations or consult a mechanic for guidance on when to replace glow plugs to prevent issues like code P0381.