AutoCodes – GMC – P0382 GMC

P0382 GMC Code - Glow Plug/Heater Circuit 'B' 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: P0382 GMC indicates Glow Plug/Heater Circuit 'B' 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 1,826

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 P0382 GMC 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 P0382 GMC - Glow Plug/Heater Circuit 'B' Malfunction - AutoCodes.com — P0382 GMC Code - Glow Plug/Heater Circuit 'B' Malfunction

What does this mean?

What are the Possible Causes of the DTC P0382 GMC?

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

How to Fix the DTC P0382 GMC?

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 P0382 GMC 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 P0382 GMC code?

Need more information on how to fix the P0382 GMC code? Get Access to Factory Service Manuals

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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 P0382 GMC Code

1. What are the common symptoms of OBDII code P0382 GMC?

- Common symptoms include hard starting, rough idling, misfiring, and possibly a glow plug warning light on the dashboard.

2. What can cause the Glow Plug/Heater Circuit 'B' Malfunction (P0382) in a GMC vehicle?

- Potential causes include a faulty glow plug, damaged wiring in the glow plug circuit, a defective glow plug control module, or a problem with the engine control module (ECM).

3. How can I diagnose the Glow Plug/Heater Circuit 'B' Malfunction in my GMC vehicle?

- Diagnosis typically involves using an OBDII scanner to retrieve the trouble code, visually inspecting the glow plug circuit and related components, and performing electrical tests to pinpoint the issue.

4. Can I continue driving my GMC with OBDII code P0382?

- It is not recommended to drive with a malfunctioning glow plug circuit as it can lead to starting issues, reduced engine performance, and potential damage to the engine components.

5. How serious is the Glow Plug/Heater Circuit 'B' Malfunction in a GMC vehicle?

- While the severity can vary, ignoring this issue can lead to difficulty starting the engine, decreased fuel efficiency, and potential engine damage due to incomplete combustion.

6. Are there any DIY repair tips for fixing OBDII code P0382 in a GMC vehicle?

- DIY enthusiasts with automotive repair experience can attempt to replace faulty glow plugs, check and repair damaged wiring, or replace the glow plug control module as potential solutions.

7. How much does it typically cost to repair the Glow Plug/Heater Circuit 'B' Malfunction in a GMC vehicle?

- The cost of repair can vary based on the specific cause of the issue, but it may range from $100 to $500, including parts and labor.

8. Can a faulty glow plug cause other issues besides triggering OBDII code P0382?

- Yes, a faulty glow plug can lead to poor cold-start performance, reduced engine power, increased emissions, and potential damage to the diesel particulate filter (DPF) in diesel vehicles.

9. Is it necessary to replace all glow plugs if one is found to be faulty?

- It is generally recommended to replace all glow plugs at the same time if one is found to be faulty to ensure consistent performance and prevent future issues.

10. How long does it typically take to repair the Glow Plug/Heater Circuit 'B' Malfunction in a GMC vehicle?

- The repair time can vary depending on the exact cause of the issue and the technician's expertise, but it usually takes between 1 to 3 hours to diagnose and fix the problem.