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P0628 Mazda Code - Suction Control Valve Circuit Low Input

Quick Answer

The P0628 diagnostic trouble code (DTC) for Mazda vehicles refers to the Suction Control Valve Circuit Low Input. Common causes include Faulty suction control valve, Wiring issues or electrical connectivity problems, ECM malfunction. 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, Wiring issues or electrical connectivity problems, ECM malfunction.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 11, 2024
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Code P0628 Mazda Description

The P0628 diagnostic trouble code (DTC) for Mazda vehicles refers to the Suction Control Valve Circuit Low Input. This code indicates a potential issue with the suction control valve within the vehicle's fuel injection system. The suction control valve is responsible for regulating the fuel pressure in the common rail diesel system. When the engine control module (ECM) detects that the input signal from the suction control valve is lower than the expected range, it triggers the P0628 code.

OBDII Code P0628 Mazda - Suction Control Valve Circuit Low Input
P0628 Mazda Code - Suction Control Valve Circuit Low Input

Common Causes of P0628 Mazda

  1. Faulty suction control valve
  2. Wiring issues or electrical connectivity problems
  3. ECM malfunction
  4. Fuel system contamination
  5. Low fuel pressure

Symptoms of P0628 Mazda

  1. Reduced engine performance
  2. Decreased fuel efficiency
  3. Engine misfires
  4. Illumination of the check engine light
  5. Rough idling or stalling

How to Fix P0628 Mazda

  1. Diagnose the issue by using a scan tool to retrieve the specific trouble code and inspect the suction control valve circuit for any visible damage.
  2. Test the suction control valve's operation by applying voltage to it and checking for proper functionality.
  3. Check the wiring harness and connectors for any signs of damage or corrosion, and repair or replace as needed.
  4. Clear the DTC and reset the ECM to see if the issue persists after repairs.
  5. Re-test the vehicle to ensure that the symptoms associated with the P0628 code have been resolved.

Cost to Fix P0628 Mazda

The typical repair costs for addressing a P0628 code may range from $200 to $500, including parts and labor. However, it's important to note that the specific diagnosis time and labor rates at auto repair shops can vary significantly. Rates in metropolitan areas or at dealerships may be higher, while independent shops may charge less. It's recommended to check local rates for a more accurate estimate before proceeding with repairs.

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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 P0628 Mazda Code

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

P0628 indicates a "Suction Control Valve Circuit Low Input," meaning there’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 valve’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 $150–$300 and more extensive repairs, such as PCM replacement, exceeding $500.

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