AutoCodes – Mazda – P0231 Mazda

P0231 Mazda Code - Low Open Or Short Circuit In The Fuel Pump Primary Circuit

Quick Answer

The Engine Control Module (ECM) provides ignition positive voltage to the coil side of the fuel pump relay. Common causes include Blown Fuel Pump fuse, Open Fuel Pump Monitor Circuit, Faulty Fuel Pump Relay. 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: P0231 Mazda indicates Low Open Or Short Circuit In The Fuel Pump Primary Circuit.
Common causes: Common causes include Blown Fuel Pump fuse, Open Fuel Pump Monitor Circuit, Faulty Fuel Pump Relay.
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 4,356

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 13, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0231 Mazda Description

The Engine Control Module (ECM) provides ignition positive voltage to the coil side of the fuel pump relay. When the ignition switch is first turned ON, the ECM energizes the fuel pump relay, which applies power to the fuel pump. The ECM enables the fuel pump relay as long as the engine is cranking or running, and crankshaft reference pulses are received. If no crankshaft reference pulses are received, the ECM de-energizes the fuel pump relay after 2 seconds. The ECM monitors the voltage on the fuel pump relay control circuit.

OBDII Code P0231 Mazda - Low Open Or Short Circuit In The Fuel Pump Primary Circuit - AutoCodes.com — P0231 Mazda Code - Low Open Or Short Circuit In The Fuel Pump Primary Circuit

What does this mean?

What are the Possible Causes of the DTC P0231 Mazda?

Blown Fuel Pump fuse
Open Fuel Pump Monitor Circuit
Faulty Fuel Pump Relay
Damaged Engine Control Module (ECM)

How to Fix the DTC P0231 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 P0231 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 P0231 Mazda code?

Need more information on how to fix the P0231 Mazda code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0231 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 P0231 Mazda Code

1. What are common symptoms of OBDII code P0231 in a Mazda?

- Common symptoms include hard starting, engine stalling, lack of power, and the fuel pump not running.

2. What does the OBDII code P0231 in a Mazda indicate?

- The code indicates a low open or short circuit in the fuel pump primary circuit.

3. What are possible causes of OBDII code P0231 in a Mazda?

- Possible causes include a faulty fuel pump, damaged wiring in the fuel pump circuit, a blown fuse, or a problem with the fuel pump relay.

4. How can I diagnose the issue related to OBDII code P0231 in my Mazda?

- You can use a multimeter to test the fuel pump circuit for continuity, check the fuel pump fuse, inspect the wiring for damage, and test the fuel pump relay.

5. Is it safe to drive my Mazda with OBDII code P0231 triggered?

- It is not recommended to drive your Mazda with this code triggered, as it can lead to engine performance issues and potential safety hazards.

6. Can I repair OBDII code P0231 in my Mazda by replacing the fuel pump?

- Replacing the fuel pump may resolve the issue, but it's important to diagnose the root cause first to ensure a proper repair.

7. How much does it typically cost to repair OBDII code P0231 in a Mazda?

- The cost of repair can vary depending on the cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

8. Are there any preventative measures to avoid OBDII code P0231 in my Mazda?

- Regularly checking the fuel pump, wiring, and related components for signs of wear or damage can help prevent issues that may trigger this code.

9. Can a DIY enthusiast fix OBDII code P0231 in a Mazda?

- Depending on the skill level and tools available, some DIY enthusiasts may be able to diagnose and repair the issue related to this code, but professional help is recommended for complex repairs.

10. How urgent is it to address OBDII code P0231 in a Mazda?

- It is important to address this code promptly to prevent potential damage to the fuel system and ensure the safe operation of your Mazda.