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P0381 2015 GMC Sierra Code - Wait To Start Indicator Control Circuit

Quick Answer

The P0381 diagnostic trouble code (DTC) in a 2015 GMC Sierra refers to the Wait To Start Indicator Control Circuit. Common causes include Faulty wait to start indicator light, Damaged wiring or connectors in the control circuit, Defective control module. 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 2015 GMC Sierra indicates Wait To Start Indicator Control Circuit.
Common causes
Common causes include Faulty wait to start indicator light, Damaged wiring or connectors in the control circuit, Defective control module.
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 18, 2024
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Code P0381 2015 GMC Sierra Description

The P0381 diagnostic trouble code (DTC) in a 2015 GMC Sierra refers to the Wait To Start Indicator Control Circuit. This code indicates that there is a malfunction in the circuit responsible for controlling the wait to start indicator light on the dashboard. The wait to start indicator light is crucial for diesel engines as it informs the driver when the engine is ready to be started, especially in cold weather conditions.

OBDII Code P0381 2015 GMC Sierra - Wait To Start Indicator Control Circuit
P0381 2015 GMC Sierra Code - Wait To Start Indicator Control Circuit

Common Causes of P0381 2015 GMC Sierra

  1. Faulty wait to start indicator light
  2. Damaged wiring or connectors in the control circuit
  3. Defective control module
  4. Corrosion or poor connections in the circuit

Symptoms of P0381 2015 GMC Sierra

  1. Delayed or non-illuminating wait to start indicator light
  2. Extended cranking times when starting the engine
  3. Rough idling or misfiring upon startup
  4. Engine stalling shortly after starting

How to Fix P0381 2015 GMC Sierra

  1. Begin by visually inspecting the wait to start indicator light, wiring, and connectors for any visible damage or corrosion.
  2. Use a multimeter to test the continuity of the wiring and check for any shorts or open circuits.
  3. Test the control module for proper functionality and replace if necessary.
  4. Clear the DTC from the vehicle's computer using a diagnostic scanner and test the system to ensure the wait to start indicator light functions correctly.
  5. If the issue persists, seek professional help to diagnose and repair any underlying electrical faults.

Cost to Fix P0381 2015 GMC Sierra

The typical repair costs for addressing a P0381 code in a 2015 GMC Sierra can range from $100 to $300, depending on the specific cause of the issue and the cost of parts and labor. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate.

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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 2015 GMC Sierra Code

1. What does the OBDII code P0381 mean on a 2015 GMC Sierra?

P0381 indicates an issue with the Wait To Start Indicator Control Circuit, which is used in diesel engines to notify the driver when it's safe to start the engine after the glow plugs have sufficiently heated.

2. What are the symptoms of code P0381 on a 2015 GMC Sierra?

Common symptoms include the Wait To Start indicator not illuminating, extended cranking times when starting, or a noticeable lack of power during cold starts.

3. What causes the P0381 code to appear on a 2015 GMC Sierra?

Potential causes include a faulty Wait To Start indicator bulb, open or shorted wiring in the control circuit, a damaged PCM (Powertrain Control Module), or issues with the glow plug control module.

4. Can I drive my 2015 GMC Sierra with the P0381 code active?

While the vehicle may still be drivable, ignoring the issue can lead to hard starts, especially in cold weather, and may cause further damage to the glow plug system over time.

5. How do I diagnose the P0381 code on a 2015 GMC Sierra?

Start by checking the Wait To Start indicator bulb, inspecting the wiring and connectors for damage, and using a multimeter to test for continuity in the control circuit. A scan tool can also help monitor the glow plug system.

6. How do I fix the P0381 code on a 2015 GMC Sierra?

Repairs may include replacing a faulty Wait To Start indicator bulb, repairing damaged wiring or connectors, or replacing a malfunctioning glow plug control module. In rare cases, the PCM may need reprogramming or replacement.

7. What tools are needed to fix the P0381 code on a 2015 GMC Sierra?

Common tools include a multimeter, a scan tool or OBDII code reader, wiring diagrams for the Wait To Start circuit, and basic hand tools for bulb or module replacement.

8. How much does it cost to repair the P0381 code on a 2015 GMC Sierra?

The cost varies depending on the issue. Replacing a bulb might cost under $50, while wiring repairs or a glow plug control module replacement can cost $100–$300. PCM replacement or reprogramming may cost more.

9. Can a bad glow plug cause the P0381 code on a 2015 GMC Sierra?

Typically, the P0381 code relates to the indicator circuit rather than the glow plugs themselves, but a malfunctioning glow plug system may indirectly contribute to the issue.

10. Will clearing the P0381 code solve the problem on a 2015 GMC Sierra?

Clearing the code may temporarily reset the system, but unless the underlying issue is fixed, the code is likely to return. Proper diagnosis and repair are necessary.

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