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Engine-Codes – GMC – P2671 2016 GMC Sierra

P2671 2016 GMC Sierra Code - Actuator High Control Circuit Group 2 High Voltage

Quick Answer

The P2671 diagnostic trouble code (DTC) for a 2016 GMC Sierra refers to the Actuator High Control Circuit Group 2 High Voltage. Common causes include Faulty Actuator: The actuator itself may be faulty, causing it to receive a higher voltage than normal, Wiring Issues: There could be a short circuit or damaged wiring in the control circuit, leading to the high voltage condition, Faulty Control Module: The control module responsible for regulating the actuator may be malfunctioning, causing it to send excessive voltage. 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
P2671 2016 GMC Sierra indicates Actuator High Control Circuit Group 2 High Voltage.
Common causes
Common causes include Faulty Actuator: The actuator itself may be faulty, causing it to receive a higher voltage than normal, Wiring Issues: There could be a short circuit or damaged wiring in the control circuit, leading to the high voltage condition, Faulty Control Module: The control module responsible for regulating the actuator may be malfunctioning, causing it to send excessive voltage.
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 17, 2024
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Code P2671 2016 GMC Sierra Description

The P2671 diagnostic trouble code (DTC) for a 2016 GMC Sierra refers to the Actuator High Control Circuit Group 2 High Voltage. This code indicates that there is a high voltage condition detected in the control circuit of actuator group 2. In simpler terms, it means that there is an issue with the electrical circuit that controls a specific actuator in the vehicle, causing it to receive a higher voltage than normal.

OBDII Code P2671 2016 GMC Sierra - Actuator High Control Circuit Group 2 High Voltage
P2671 2016 GMC Sierra Code - Actuator High Control Circuit Group 2 High Voltage

Common Causes of P2671 2016 GMC Sierra

  1. Faulty Actuator: The actuator itself may be faulty, causing it to receive a higher voltage than normal.
  2. Wiring Issues: There could be a short circuit or damaged wiring in the control circuit, leading to the high voltage condition.
  3. Faulty Control Module: The control module responsible for regulating the actuator may be malfunctioning, causing it to send excessive voltage.
  4. Corrosion: Corrosion or poor connections in the electrical system can also lead to high voltage conditions.
  5. Software Glitch: In some cases, a software glitch or programming error in the vehicle's computer system can cause this issue.

Symptoms of P2671 2016 GMC Sierra

  1. Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the vehicle's dashboard.
  2. Reduced Performance: The vehicle may experience reduced performance, such as decreased acceleration or power.
  3. Rough Idle: The engine may idle roughly or inconsistently due to the high voltage condition affecting the actuator.
  4. Poor Fuel Efficiency: The vehicle may consume more fuel than usual due to the actuator not functioning properly.
  5. Harsh Shifting: If the actuator controls the transmission, you may experience harsh or erratic shifting while driving.

How to Fix P2671 2016 GMC Sierra

  1. Diagnose the Issue: Use a diagnostic scanner to retrieve the trouble code and perform further testing to pinpoint the exact cause of the high voltage condition.
  2. Inspect Wiring: Check the wiring harness for any signs of damage, corrosion, or loose connections. Repair or replace any faulty wiring.
  3. Test Actuator: Test the actuator to ensure it is functioning correctly. Replace the actuator if it is found to be faulty.
  4. Check Control Module: Test the control module to determine if it is sending the correct signals to the actuator. Replace the control module if necessary.
  5. Clear Codes and Test: Once the repairs are completed, clear the trouble codes from the vehicle's computer system and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P2671 2016 GMC Sierra

The cost of repairing a P2671 DTC can vary depending on the specific cause of the issue and the labor rates in your area. On average, you can expect to pay anywhere from $200 to $500 for parts and labor to address this problem. Keep in mind that diagnostic time and labor rates can vary, so it's a good idea to get quotes from different auto repair shops to find the best price. Additionally, rates at dealerships or in metropolitan areas may be higher, while independent shops may offer more competitive pricing. Be sure to factor in these variables when estimating the cost of repairing this issue.

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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 P2671 2016 GMC Sierra Code

1. What does the OBDII code P2671 mean on a 2016 GMC Sierra?

P2671 indicates a high voltage issue in the Actuator High Control Circuit Group 2, meaning there's an electrical problem in a specific actuator circuit.

2. What are the common symptoms of code P2671 in a 2016 GMC Sierra?

Symptoms may include an illuminated Check Engine Light, erratic engine performance, or failure of certain actuators to function correctly.

3. What causes the P2671 code to appear?

Common causes include damaged wiring, a faulty actuator, a short circuit, a defective control module, or corroded electrical connections.

4. Can I drive my 2016 GMC Sierra with the P2671 code?

While the vehicle may still be drivable, it’s not recommended as the issue could lead to further damage or unsafe driving conditions.

5. How do I diagnose the P2671 code on a GMC Sierra?

Diagnosis typically involves a visual inspection of the wiring and connectors, testing the actuator for proper operation, and using a multimeter to check for voltage irregularities.

6. What’s the most common fix for the P2671 code?

The most common fix is repairing or replacing damaged wiring or connectors, though replacing the actuator or control module may also be necessary.

7. How much does it cost to repair a P2671 code in a GMC Sierra?

Repair costs can vary but typically range from $100 to $500 depending on whether it’s a simple wiring repair or a part replacement.

8. Can a faulty ECM cause the P2671 code?

Yes, a malfunctioning Engine Control Module (ECM) could potentially cause this code if it fails to properly regulate the actuator circuit.

9. Is the P2671 code specific to GMC vehicles?

No, P2671 is a generic OBDII code, but the exact cause and repair steps may vary depending on the make and model of the vehicle.

10. What tools are needed to fix the P2671 code?

Basic tools include a diagnostic scanner, a multimeter for electrical testing, and possibly wiring repair tools like crimpers and heat shrink tubing.

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