AutoCodes – Buick – P2671 Buick

P2671 Buick 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 Buick 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.

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Code Popularity 300

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
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Code P2671 Buick 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 Buick - Actuator High Control Circuit Group 2 High Voltage - AutoCodes.com — P2671 Buick Code - Actuator High Control Circuit Group 2 High Voltage

What does this mean?

What are the Possible Causes of the DTC P2671 Buick?

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 Buick?

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 Buick 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 P2671 Buick Code

What are common symptoms of OBDII code P2671 Buick?

- Common symptoms include rough idling, decreased engine performance, and the check engine light illuminating on the dashboard.

What are the possible causes of OBDII code P2671 Buick?

- The code P2671 in a Buick may be caused by a faulty actuator, issues with the control circuit, wiring problems, or a malfunctioning PCM.

How serious is OBDII code P2671 Buick?

- While the vehicle may still be operable with this code, it is important to address it promptly to prevent potential damage to other engine components.

How can I diagnose OBDII code P2671 Buick?

- Diagnosing this code typically involves using an OBDII scanner to retrieve the code, inspecting the actuator and control circuit for any visible damage, and testing the electrical connections.

Can I still drive my Buick with OBDII code P2671?

- It is generally not recommended to drive the vehicle with this code present, as it can lead to further engine issues if left unaddressed.

How can I repair OBDII code P2671 Buick?

- Repair options for this code may include replacing the actuator, repairing or replacing damaged wiring, or resetting the PCM to clear the code.

Is it safe to reset the PCM to clear OBDII code P2671 Buick?

- Resetting the PCM to clear the code is a temporary solution and may not address the underlying issue causing the code to appear. It is best to diagnose and repair the root cause of the problem.

What should I do if OBDII code P2671 Buick keeps coming back after repair?

- If the code keeps reappearing after repair, it may indicate that the root cause of the issue was not fully addressed. Revisiting the diagnosis and repair process is recommended.

Can a DIY enthusiast fix OBDII code P2671 Buick?

- While some DIY enthusiasts may have the skills to diagnose and repair this code, it is recommended to consult a professional mechanic for accurate diagnosis and proper repair to avoid further complications.