AutoCodes – Mazda – P1264 Mazda

P1264 Mazda Code - Cylinder #4 High To Low Side Short

Quick Answer

The fuel injectors are connected to the high-pressure fuel rail and deliver a calibrated amount of fuel directly into the combustion chamber. Common causes include Faulty Fuel Injector 4, Fuel Injector 4 harness is open or shorted, Fuel Injector 4 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: P1264 Mazda indicates Cylinder #4 High To Low Side Short.
Common causes: Common causes include Faulty Fuel Injector 4, Fuel Injector 4 harness is open or shorted, Fuel Injector 4 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 10,910

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 Jul 02, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1264 Mazda Description

The fuel injectors are connected to the high-pressure fuel rail and deliver a calibrated amount of fuel directly into the combustion chamber. The piezo actuator is commanded on by the PCM during the main injection stage for approximately 0-400 microseconds. The fuel injectors on and off time are controlled by the piezo actuator device which allows extreme precision during the injection cycle. The Diagnostic Trouble Code (DTC) is detected by the Fuel Injector Interface Module in the secondary (rearward) fuel injector circuit.

OBDII Code P1264 Mazda - Cylinder #4 High To Low Side Short - AutoCodes.com — P1264 Mazda Code - Cylinder #4 High To Low Side Short

What does this mean?

What are the Possible Causes of the DTC P1264 Mazda?

Faulty Fuel Injector 4
Fuel Injector 4 harness is open or shorted
Fuel Injector 4 circuit poor electrical connection
Faulty Fuel Injector Interface Module

How to Fix the DTC P1264 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 P1264 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 P1264 Mazda code?

Need more information on how to fix the P1264 Mazda code? Get Access to Factory Service Manuals

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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 P1264 Mazda Code

1. What does the OBDII code P1264 mean on a Mazda?

P1264 indicates a Cylinder #4 High to Low Side Short, meaning there is an electrical issue, such as a short circuit, in the fuel injector circuit for cylinder #4.

2. What are the symptoms of P1264 in a Mazda?

Symptoms may include engine misfires, poor performance, rough idling, decreased fuel efficiency, and the check engine light turning on.

3. What causes the P1264 code to appear?

Common causes include a shorted or open fuel injector, damaged wiring or connectors, a faulty powertrain control module (PCM), or corrosion in the injector circuit.

4. Can I drive my Mazda with a P1264 code?

Itâ€™s not recommended to drive with this code, as it can lead to further engine damage, poor performance, and unsafe driving conditions.

5. How do I diagnose a P1264 code on my Mazda?

Start by inspecting the wiring and connectors for cylinder #4's fuel injector for damage or corrosion. Use a multimeter to test for short circuits or continuity issues.

6. How can a P1264 code be fixed?

Repairs may include replacing or repairing the cylinder #4 fuel injector, fixing damaged wiring, cleaning corroded connectors, or replacing the PCM if itâ€™s defective.

7. How much does it cost to repair a P1264 code on a Mazda?

Repair costs can range from $100 to $500, depending on whether you need to replace the fuel injector, repair wiring, or address PCM issues.

8. Can a dirty fuel injector cause the P1264 code?

While a dirty injector might cause performance issues, P1264 specifically refers to an electrical short, so cleaning the injector alone wonâ€™t resolve this code.

9. Will resetting the check engine light fix the P1264 code?

Resetting the light may temporarily clear the code, but the underlying issue will need to be repaired to prevent the code from returning.

10. Can a failing PCM trigger the P1264 code?

Yes, a failing PCM can incorrectly control the fuel injectorâ€™s electrical circuit and cause a P1264 code, but this is less common than wiring or injector issues.