AutoCodes – Chevrolet – P0380 Chevrolet

P0380 Chevrolet Code - Glow Plug/Heater Circuit 'A' 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: P0380 Chevrolet indicates Glow Plug/Heater Circuit 'A' 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 14,608

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
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code P0380 Chevrolet 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 P0380 Chevrolet - Glow Plug/Heater Circuit 'A' Malfunction - AutoCodes.com — P0380 Chevrolet Code - Glow Plug/Heater Circuit 'A' Malfunction

What does this mean?

What are the Possible Causes of the DTC P0380 Chevrolet?

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

How to Fix the DTC P0380 Chevrolet?

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

User Submitted Video

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0380 Chevrolet 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 P0380 Chevrolet Code

1. What are the common symptoms of OBDII code P0380 in a Chevrolet vehicle?

- Common symptoms include hard starting, rough idling, poor fuel economy, and potentially a Check Engine Light.

2. What does the OBDII code P0380 Chevrolet indicate?

- The code P0380 indicates a malfunction in the Glow Plug/Heater Circuit 'A' in the Chevrolet vehicle.

3. What are the possible causes of the Glow Plug/Heater Circuit 'A' malfunction in a Chevrolet?

- Possible causes include faulty glow plugs, a defective glow plug relay, damaged wiring or connectors, or a problem with the engine control module (ECM).

4. How can I diagnose the OBDII code P0380 in my Chevrolet?

- Diagnosis typically involves checking the glow plugs for proper operation, testing the glow plug relay, inspecting the wiring for damage, and scanning the ECM for fault codes.

5. Can I still drive my Chevrolet with the OBDII code P0380 present?

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

6. How can I repair the Glow Plug/Heater Circuit 'A' malfunction in my Chevrolet?

- Repair methods may involve replacing faulty glow plugs, repairing damaged wiring, replacing the glow plug relay, or addressing any ECM issues.

7. Are there any DIY tips for troubleshooting OBDII code P0380 in a Chevrolet?

- DIY tips include visually inspecting the glow plugs and wiring for damage, testing the glow plug relay with a multimeter, and ensuring proper connections.

8. Is it necessary to reset the OBDII code P0380 after repairing the Glow Plug/Heater Circuit 'A' issue?

- Yes, it is recommended to clear the trouble codes using an OBDII scanner after repairing the glow plug circuit to reset the Check Engine Light.

9. Can extreme weather conditions affect the Glow Plug/Heater Circuit 'A' in a Chevrolet?

- Yes, extreme cold weather can put additional strain on the glow plug system, potentially leading to malfunctions and triggering OBDII code P0380.

10. How often should the glow plugs be inspected and replaced in a Chevrolet to prevent OBDII code P0380?

- Glow plugs should be inspected regularly as part of routine maintenance and replaced as needed to prevent issues with the glow plug circuit and OBDII code P0380.