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Engine-Codes – GMC – P0381 2018 GMC Sierra

P0381 2018 GMC Sierra Code - Wait To Start Indicator Control Circuit

Quick Answer

The P0381 diagnostic trouble code (DTC) for a 2018 GMC Sierra relates to the Wait To Start Indicator Control Circuit. Common causes include Faulty wiring or connectors in the wait to start indicator circuit, Malfunctioning engine control module (ECM), Issues with the glow plug system. 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 2018 GMC Sierra indicates Wait To Start Indicator Control Circuit.
Common causes
Common causes include Faulty wiring or connectors in the wait to start indicator circuit, Malfunctioning engine control module (ECM), Issues with the glow plug system.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 11, 2024
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Code P0381 2018 GMC Sierra Description

The P0381 diagnostic trouble code (DTC) for a 2018 GMC Sierra relates to the Wait To Start Indicator Control Circuit. This code indicates that there is a malfunction within the circuit that controls the wait to start indicator on the dashboard of the vehicle. The wait to start indicator is an important feature that informs the driver when the engine is ready to be started, especially in diesel engines where glow plugs need to warm up before ignition. When this circuit malfunctions, it can lead to issues with starting the vehicle, reduced engine performance, and potentially even engine damage if not addressed promptly.

OBDII Code P0381 2018 GMC Sierra - Wait To Start Indicator Control Circuit
P0381 2018 GMC Sierra Code - Wait To Start Indicator Control Circuit

Common Causes of P0381 2018 GMC Sierra

  1. Faulty wiring or connectors in the wait to start indicator circuit.
  2. Malfunctioning engine control module (ECM).
  3. Issues with the glow plug system.
  4. Corrosion or damage to the wait to start indicator.

Symptoms of P0381 2018 GMC Sierra

  1. Check engine light is illuminated.
  2. Delayed start or difficulty starting the engine.
  3. Reduced engine performance or rough idling.
  4. Poor fuel efficiency.
  5. Glow plug indicator not functioning properly.

How to Fix P0381 2018 GMC Sierra

  1. Begin by diagnosing the root cause of the issue using a diagnostic scanner to retrieve the specific fault codes.
  2. Inspect the wiring and connectors in the wait to start indicator control circuit for any damage or corrosion. Repair or replace as needed.
  3. Check the glow plug system for any faults or malfunctions. Test the glow plugs and replace any faulty components.
  4. If the issue persists, inspect the engine control module (ECM) for any signs of damage or malfunction. Replace if necessary.
  5. Clear the fault codes, reset the ECM, and test the vehicle to ensure the issue has been resolved.

Cost to Fix P0381 2018 GMC Sierra

The repair costs for addressing a P0381 code on a 2018 GMC Sierra can vary depending on the specific cause of the issue. On average, the parts for this repair may cost between $100 to $300, with labor costs ranging from $100 to $200. However, it's important to note that these are rough estimates and actual costs may vary based on factors such as the location of the repair shop, the make and model of the vehicle, and the extent of the repairs needed. It is recommended to consult with a professional mechanic for a more accurate cost estimate based on your specific circumstances.

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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 2018 GMC Sierra Code

1. What does the OBDII code P0381 mean on a 2018 GMC Sierra?

P0381 indicates an issue with the Wait To Start Indicator Control Circuit, which is part of the diesel engine's glow plug system.

2. What are the symptoms of code P0381 in a 2018 GMC Sierra?

Common symptoms include the Wait To Start light not functioning, difficulty starting the engine in cold weather, or no noticeable symptoms at all.

3. What causes the P0381 code to appear?

Possible causes include a faulty Wait To Start indicator bulb, damaged wiring or connectors in the control circuit, a defective glow plug control module, or blown fuses.

4. Can I drive my 2018 GMC Sierra with a P0381 code?

Yes, you can drive with this code, but starting the engine in cold weather may become difficult, and ignoring the issue could lead to further damage over time.

5. How do I diagnose a P0381 code on my GMC Sierra?

Start by inspecting the Wait To Start indicator bulb, checking for damaged wiring or loose connectors, and testing the glow plug control module with a multimeter.

6. How do I fix the P0381 code on a 2018 GMC Sierra?

Repairs may include replacing a burnt-out indicator bulb, repairing damaged wiring or connectors, or replacing the glow plug control module if necessary.

7. What tools are needed to diagnose the P0381 code?

You’ll need an OBDII scanner, a multimeter for electrical testing, and basic tools to inspect and repair wiring or components.

8. How much does it cost to fix code P0381 on a 2018 GMC Sierra?

Repair costs vary, but replacing an indicator bulb or fixing wiring is relatively inexpensive, while a glow plug control module replacement could cost $200–$400 including labor.

9. Can a bad battery cause the P0381 code?

While not directly related, a weak or failing battery can affect the glow plug system’s performance, which might indirectly trigger related issues.

10. Is the P0381 code covered under warranty for a 2018 GMC Sierra?

It depends on your vehicle’s warranty terms, but emissions-related components like the glow plug system may be covered under the powertrain warranty.

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