AutoCodes – GMC – P2671 2018 GMC Sierra

P2671 2018 GMC Sierra Code - Actuator High Control Circuit Group 2 High Voltage

Quick Answer

The Transmission Control Module (TCM) receives information from a variety of sensors, switches, and serial data information from other control modules. Common causes include Faulty Transmission Control Solenoid Valve, Faulty Transmission Control Module (TCM), Transmission Control Module harness is open or shorted. 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 2018 GMC Sierra indicates Actuator High Control Circuit Group 2 High Voltage.
Common causes: Common causes include Faulty Transmission Control Solenoid Valve, Faulty Transmission Control Module (TCM), Transmission Control Module harness is open or shorted.
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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 157

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 18, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P2671 2018 GMC Sierra Description

The Transmission Control Module (TCM) receives information from a variety of sensors, switches, and serial data information from other control modules. This information is used to control a combination of solenoid valves to obtain the correct line pressure, gear ratio, and torque converter clutch operation. The Transmission Control Solenoid Valves are electro-mechanically operated valves. The valves are controlled by an electric current through the solenoid. The TCM high side driver 2 is located inside of the control solenoid valve assembly which has no serviceable parts. The high side driver 2 provides power to the Transmission Control Module pressure control solenoids and shift solenoids. The Diagnostic Trouble Code (DTC) will be set when the TCM detects an internal short to voltage on the high side driver 2 circuit for 1 s after engine start.

OBDII Code P2671 2018 GMC Sierra - Actuator High Control Circuit Group 2 High Voltage - AutoCodes.com — P2671 2018 GMC Sierra Code - Actuator High Control Circuit Group 2 High Voltage

What does this mean?

What are the Possible Causes of the DTC P2671 2018 GMC Sierra?

Faulty Transmission Control Solenoid Valve
Faulty Transmission Control Module (TCM)
Transmission Control Module harness is open or shorted
Transmission Control Module circuit poor electrical connection

How to Fix the DTC P2671 2018 GMC Sierra?

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 P2671 2018 GMC Sierra 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 P2671 2018 GMC Sierra code?

Need more information on how to fix the P2671 2018 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P2671 2018 GMC Sierra code diagnosed by a professional: Find a repair shop in your area

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 2018 GMC Sierra Code

1. What are common symptoms of OBDII code P2671 in a 2018 GMC Sierra?

The common symptoms of OBDII code P2671 in a 2018 GMC Sierra include rough idling, poor acceleration, and decreased fuel efficiency.

2. What does the OBDII code P2671 "Actuator High Control Circuit Group 2 High Voltage" indicate in a 2018 GMC Sierra?

The code P2671 indicates a problem with the actuator high control circuit group 2, specifically high voltage, in the 2018 GMC Sierra.

3. What are possible causes of OBDII code P2671 in a 2018 GMC Sierra?

Possible causes of OBDII code P2671 in a 2018 GMC Sierra include a faulty actuator, wiring issues, or a problem with the actuator control module.

4. How can I diagnose the OBDII code P2671 in my 2018 GMC Sierra?

To diagnose the OBDII code P2671 in a 2018 GMC Sierra, you can use an OBDII scanner to read the code, inspect the actuator and related wiring, and test the actuator control module for proper function.

5. Can I still drive my 2018 GMC Sierra with the OBDII code P2671 present?

It is not recommended to drive your 2018 GMC Sierra with the OBDII code P2671 present, as it can lead to further damage to the actuator system and potentially affect vehicle performance.

6. How can I repair OBDII code P2671 in my 2018 GMC Sierra?

The repair for OBDII code P2671 in a 2018 GMC Sierra may involve replacing the faulty actuator, repairing any damaged wiring, or reprogramming the actuator control module.

7. Will resetting the OBDII code P2671 in my 2018 GMC Sierra make it go away permanently?

Resetting the OBDII code P2671 in a 2018 GMC Sierra may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear.

8. Is it safe to continue driving my 2018 GMC Sierra if the OBDII code P2671 keeps coming back after repairs?

If the OBDII code P2671 keeps reappearing in your 2018 GMC Sierra after repairs, it is best to have the vehicle inspected by a professional to ensure the issue is properly resolved before driving.

9. Can a DIY enthusiast fix the OBDII code P2671 in a 2018 GMC Sierra?

A DIY enthusiast with the right tools and knowledge may be able to fix the OBDII code P2671 in a 2018 GMC Sierra, but it is recommended to consult a professional for accurate diagnosis and repairs.

10. How much does it typically cost to repair OBDII code P2671 in a 2018 GMC Sierra?

The cost to repair OBDII code P2671 in a 2018 GMC Sierra can vary depending on the specific cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.