AutoCodes – Mazda – P0628 Mazda

P0628 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: P0628 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 3,510

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 P0628 Mazda Description

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

OBDII Code P0628 Mazda - Suction Control Valve Circuit Low Input - AutoCodes.com — P0628 Mazda Code - Suction Control Valve Circuit Low Input

What does this mean?

What are the Possible Causes of the DTC P0628 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 P0628 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 P0628 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 P0628 Mazda code?

Need more information on how to fix the P0628 Mazda code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0628 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 P0628 Mazda Code

1. What does the OBDII code P0628 mean on a Mazda?

P0628 indicates a "Suction Control Valve Circuit Low Input," meaning thereâ€™s a low voltage or electrical issue in the circuit controlling the suction control valve in the fuel system.

2. What are the common symptoms of P0628 in Mazda vehicles?

Symptoms include poor engine performance, difficulty starting, reduced fuel efficiency, and possibly the check engine light turning on.

3. What causes the P0628 code on a Mazda?

Common causes include a faulty suction control valve, damaged wiring or connectors in the valve circuit, a failing fuel pump, or a malfunctioning PCM (Powertrain Control Module).

4. Can a faulty suction control valve cause a P0628 code?

Yes, a malfunctioning suction control valve is one of the primary reasons for this code, as it fails to regulate fuel pressure properly.

5. How do you diagnose a P0628 code on a Mazda?

Diagnosis involves inspecting the suction control valve, checking for damaged or corroded wiring, testing the valveâ€™s circuit for proper voltage, and scanning the PCM for additional faults.

6. Is it safe to drive with a P0628 code?

Driving with a P0628 code is not recommended, as it can lead to poor engine performance, potential stalling, and long-term damage to the fuel system.

7. How do you fix a P0628 code on a Mazda?

Potential fixes include repairing or replacing damaged wiring, replacing the suction control valve, testing and replacing the fuel pump if necessary, or reprogramming the PCM.

8. What tools are needed to troubleshoot a P0628 code?

Tools include an OBDII scanner, a multimeter to check voltage, and possibly a fuel pressure gauge to test the fuel system.

9. Does the P0628 code always mean the suction control valve is bad?

No, while the suction control valve is a common culprit, the issue could also stem from wiring problems, a failing fuel pump, or even a PCM fault.

10. How much does it cost to repair a P0628 code on a Mazda?

Repair costs vary depending on the issue, with suction control valve replacement costing $150â€“$300 and more extensive repairs, such as PCM replacement, exceeding $500.