AutoCodes – Mazda – P0091 Mazda

P0091 Mazda Code - Fuel Pressure Regulator Solenoid 1 Control Circuit Low Voltage

Quick Answer

The Engine Control Module (ECM) uses commanded fuel pump flow to determine a desired fuel rail pressure. Common causes include Faulty fuel pressure sensor, Fuel pressure sensor harness is open or shorted, Fuel pressure sensor electrical circuit poor 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: P0091 Mazda indicates Fuel Pressure Regulator Solenoid 1 Control Circuit Low Voltage.
Common causes: Common causes include Faulty fuel pressure sensor, Fuel pressure sensor harness is open or shorted, Fuel pressure sensor electrical circuit poor 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 24,632

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 Oct 25, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0091 Mazda Description

The Engine Control Module (ECM) uses commanded fuel pump flow to determine a desired fuel rail pressure. The actual fuel pressure is monitored using the Fuel Rail Pressure (FRP) Sensor.

OBDII Code P0091 Mazda - Fuel Pressure Regulator Solenoid 1 Control Circuit Low Voltage - AutoCodes.com — P0091 Mazda Code - Fuel Pressure Regulator Solenoid 1 Control Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0091 Mazda?

Faulty fuel pressure sensor
Fuel pressure sensor harness is open or shorted
Fuel pressure sensor electrical circuit poor connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0091 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 P0091 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 P0091 Mazda code?

Need more information on how to fix the P0091 Mazda code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0091 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 P0091 Mazda Code

1. What are common symptoms of OBDII code P0091 in a Mazda related to the Fuel Pressure Regulator Solenoid 1 Control Circuit Low Voltage?

- Common symptoms include rough idling, engine misfires, decreased fuel efficiency, and difficulty starting the vehicle.

2. What are the possible causes of OBDII code P0091 in a Mazda related to the Fuel Pressure Regulator Solenoid 1 Control Circuit Low Voltage?

- Possible causes include a faulty fuel pressure regulator solenoid, damaged wiring or connectors in the control circuit, low fuel pressure, or a malfunctioning fuel pump.

3. How can I diagnose the issue causing OBDII code P0091 in my Mazda related to the Fuel Pressure Regulator Solenoid 1 Control Circuit Low Voltage?

- You can use a scan tool to check for the presence of the code, inspect the wiring and connectors for any visible damage, and test the fuel pressure regulator solenoid and fuel pump for proper operation.

4. Is it safe to drive my Mazda with OBDII code P0091 related to the Fuel Pressure Regulator Solenoid 1 Control Circuit Low Voltage?

- It is not recommended to drive the vehicle with this code present, as it can lead to further engine damage and poor performance. It is best to address the issue promptly.

5. How can I repair OBDII code P0091 in my Mazda related to the Fuel Pressure Regulator Solenoid 1 Control Circuit Low Voltage?

- The repair process may involve replacing the fuel pressure regulator solenoid, repairing or replacing damaged wiring or connectors, checking and adjusting the fuel pressure, or replacing the fuel pump if necessary.

6. Can a DIY enthusiast fix OBDII code P0091 in a Mazda related to the Fuel Pressure Regulator Solenoid 1 Control Circuit Low Voltage?

- Depending on your skill level and access to tools, you may be able to address this issue yourself by following a repair manual specific to your Mazda model. However, professional help may be required for more complex diagnostics and repairs.

7. How much does it typically cost to repair OBDII code P0091 in a Mazda related to the Fuel Pressure Regulator Solenoid 1 Control Circuit Low Voltage?

- The cost of repair can vary depending on the specific cause of the issue, the parts needed, and labor charges. It is recommended to obtain quotes from reputable mechanics or shops for an accurate estimate.

8. Will resetting the OBDII code P0091 in my Mazda related to the Fuel Pressure Regulator Solenoid 1 Control Circuit Low Voltage make the issue go away?

- Resetting the code may temporarily clear the check engine light, but if the underlying problem is not addressed, the code is likely to reappear. It is important to diagnose and repair the issue to prevent further issues.