AutoCodes – Mazda – P0629 Mazda

P0629 Mazda Code - Suction Control Valve Circuit Low Input

Quick Answer

The Powertrain Control Module (PCM) monitors the Suction Control Valve Circuit current while the engine is running. Common causes include Faulty Suction Control Valve, Suction Control Valve harness is open or shorted, Suction 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: P0629 Mazda indicates Suction Control Valve Circuit Low Input.
Common causes: Common causes include Faulty Suction Control Valve, Suction Control Valve harness is open or shorted, Suction 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.

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Code Popularity 687

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 Apr 04, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0629 Mazda Description

The Powertrain Control Module (PCM) monitors the Suction Control Valve Circuit current while the engine is running. If the PCM detects circuit current is more than 1 A when the suction control valve is off, the PCM determines that there is a malfunction in the suction control valve circuit.

OBDII Code P0629 Mazda - Suction Control Valve Circuit Low Input - AutoCodes.com — P0629 Mazda Code - Suction Control Valve Circuit Low Input

What does this mean?

What are the Possible Causes of the DTC P0629 Mazda?

Faulty Suction Control Valve
Suction Control Valve harness is open or shorted
Suction Control Valve circuit poor electrical connection
Faulty Powertrain Control Module (PCM)

How to Fix the DTC P0629 Mazda?

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 P0629 Mazda 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 P0629 Mazda code?

Need more information on how to fix the P0629 Mazda code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0629 Mazda 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 P0629 Mazda Code

1. What are the common symptoms of OBDII code P0629 in a Mazda related to the Suction Control Valve Circuit Low Input?

The common symptoms include poor engine performance, rough idling, stalling, and potentially reduced fuel efficiency.

2. What are the possible causes of the Suction Control Valve Circuit Low Input error code in a Mazda?

Possible causes include a faulty suction control valve, damaged wiring or connectors, low fuel pressure, or a malfunctioning PCM.

3. How can I diagnose the Suction Control Valve Circuit Low Input issue in my Mazda?

Diagnosis typically involves using a scan tool to read the OBDII code, checking the suction control valve for proper operation, inspecting wiring for damage, and testing fuel pressure.

4. Can I drive my Mazda with the P0629 code present?

It is not recommended to drive your Mazda with the Suction Control Valve Circuit Low Input code as it can lead to further engine damage and potential safety hazards.

5. How can I repair the Suction Control Valve Circuit Low Input issue in my Mazda?

Repair options may include replacing the suction control valve, repairing damaged wiring or connectors, resolving fuel pressure issues, or reprogramming the PCM.

6. Is it possible to clear the P0629 code in a Mazda without fixing the underlying issue?

While you can clear the code temporarily, it is crucial to address the root cause to prevent further problems and potential engine damage.

7. How much does it typically cost to repair the Suction Control Valve Circuit Low Input issue in a Mazda?

The cost varies depending on the specific cause of the issue, but repairs can range from a simple wiring fix to a more involved valve replacement, potentially costing a few hundred dollars.

8. Can a DIY enthusiast fix the Suction Control Valve Circuit Low Input problem in a Mazda?

Depending on your mechanical skills and access to tools, you may be able to address simpler causes like damaged wiring. However, more complex issues may require professional expertise.

9. Will the Suction Control Valve Circuit Low Input issue cause my Mazda to fail an emissions test?

Yes, unresolved issues related to the P0629 code can lead to increased emissions, potentially causing your Mazda to fail an emissions test.

10. How can I prevent the Suction Control Valve Circuit Low Input error code from occurring in my Mazda in the future?

Regular maintenance, such as checking fuel pressure, inspecting wiring, and addressing any engine performance issues promptly, can help prevent the recurrence of this error code.