AutoCodes – Pontiac – B3674 Pontiac

B3674 Pontiac Code - Movable Roof Control Valve 1 Circuit

Quick Answer

The folding top uses electronically controlled valves to control the flow of hydraulic fluid. Common causes include Faulty Movable Roof Control Valve, Movable Roof Control Valve harness is open or shorted, Movable Roof Control Valve circuit poor electrical connection. 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: B3674 Pontiac indicates Movable Roof Control Valve 1 Circuit.
Common causes: Common causes include Faulty Movable Roof Control Valve, Movable Roof Control Valve harness is open or shorted, Movable Roof Control Valve circuit poor electrical connection.
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 457

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 Mar 13, 2020

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

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

Code B3674 Pontiac Description

The folding top uses electronically controlled valves to control the flow of hydraulic fluid. The Folding Top Control (FTC) Module controls Valve 1 (V1) by supplying voltage to the valve. The FTC Module also monitors the control circuit of V1 for proper operation. The Diagnostic Trouble Code (DTC) sets if an open or short to ground is detected on the control circuit of V1.

OBDII Code B3674 Pontiac - Movable Roof Control Valve 1 Circuit - AutoCodes.com — B3674 Pontiac Code - Movable Roof Control Valve 1 Circuit

What does this mean?

What are the Possible Causes of the DTC B3674 Pontiac?

Faulty Movable Roof Control Valve
Movable Roof Control Valve harness is open or shorted
Movable Roof Control Valve circuit poor electrical connection
Faulty Folding Top Control (FTC) Module

How to Fix the DTC B3674 Pontiac?

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 does this mean?

Code Tech Notes

B3674 01 Movable Roof Control Valve 1 Circuit short to battery
B3674 02 Movable Roof Control Valve 1 Circuit short to ground
B3674 04 Movable Roof Control Valve 1 Circuit open circuit

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B3674 Pontiac 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 B3674 Pontiac code?

Need more information on how to fix the B3674 Pontiac code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B3674 Pontiac 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 B3674 Pontiac Code

What does the OBDII code B3674 mean for a Pontiac vehicle?

B3674 refers to an issue with the Movable Roof Control Valve 1 Circuit, indicating a malfunction in the control system that manages the vehicle's roof mechanism.

What are the common symptoms associated with the B3674 code?

Common symptoms may include the movable roof not operating correctly, such as failing to open or close, unusual noises from the roof mechanism, or warning lights on the dashboard.

What could cause the B3674 code to trigger?

Possible causes include a faulty movable roof control valve, damaged wiring or connectors in the circuit, or issues with the vehicle's body control module (BCM).

How can I diagnose the B3674 code?

Start by visually inspecting the wiring and connectors related to the movable roof system for damage. Then, use an OBDII scanner to check for additional codes and test the control valve's functionality.

What is the typical repair for a B3674 code?

Repairs may involve replacing a faulty movable roof control valve, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the body control module if necessary.

Can I drive my vehicle with the B3674 code present?

While it may be possible to drive the vehicle, it is not advisable as the roof mechanism may not function properly, potentially leading to further damage or water leaks.

Is it possible to reset the B3674 code after repairs?

Yes, after completing repairs, you can reset the code using an OBDII scanner. However, ensure all issues are resolved before resetting to prevent the code from reappearing.

How much does it typically cost to fix a B3674 code?

Repair costs can vary widely based on the exact issue, ranging from $100 for simple wiring repairs to $500 or more for replacing the control valve or BCM.

Are there any DIY tips for addressing the B3674 code?

If comfortable, check and clean electrical connections related to the movable roof, inspect for any visible damage, and test the control valve with a multimeter for continuity before seeking professional help.