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

Quick Answer

The P1264 diagnostic trouble code for Mazda vehicles indicates that there is a high to low side short in cylinder #4. Common causes include The P1264 code can be triggered by a variety of issues, including a faulty fuel injector in cylinder #4, a short circuit in the wiring harness, a damaged connector, or a problem with the ECM itself, Other potential causes may include corrosion in the electrical connections, a damaged injector driver circuit, or a malfunctioning fuel injector control module. 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 The P1264 code can be triggered by a variety of issues, including a faulty fuel injector in cylinder #4, a short circuit in the wiring harness, a damaged connector, or a problem with the ECM itself, Other potential causes may include corrosion in the electrical connections, a damaged injector driver circuit, or a malfunctioning fuel injector control module.
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 10, 2024
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Code P1264 Mazda Description

The P1264 diagnostic trouble code for Mazda vehicles indicates that there is a high to low side short in cylinder #4. This means that there is an electrical issue in the fuel injector circuit for cylinder #4. In a typical fuel injector circuit, the high side provides power to the injector, while the low side is controlled by the engine control module (ECM) to ground the injector and allow fuel to be injected into the cylinder. A short circuit between the high and low sides can disrupt this process, leading to improper fuel delivery and potentially causing engine performance issues.

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

Common Causes of P1264 Mazda

The P1264 code can be triggered by a variety of issues, including a faulty fuel injector in cylinder #4, a short circuit in the wiring harness, a damaged connector, or a problem with the ECM itself. Other potential causes may include corrosion in the electrical connections, a damaged injector driver circuit, or a malfunctioning fuel injector control module.

Symptoms of P1264 Mazda

  1. Check engine light illuminated
  2. Rough idling
  3. Engine misfires
  4. Hesitation during acceleration
  5. Reduced fuel efficiency

How to Fix P1264 Mazda

  1. Begin by performing a visual inspection of the wiring harness, connectors, and fuel injector in cylinder #4 to check for any visible damage or corrosion.
  2. Use a multimeter to test the resistance of the fuel injector in cylinder #4 to determine if it is within the manufacturer's specifications.
  3. Test the continuity of the wiring harness and connectors to identify any short circuits or open circuits that may be causing the issue.
  4. If necessary, replace the faulty fuel injector, repair or replace any damaged wiring or connectors, and clear the diagnostic trouble codes from the ECM.
  5. After completing the repairs, perform a test drive to confirm that the issue has been resolved and that the check engine light does not reappear.

Cost to Fix P1264 Mazda

The cost of repairing a P1264 code in a Mazda vehicle can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. In general, the cost of replacing a fuel injector can range from $150 to $300 per injector, while the cost of repairing wiring or connectors may vary based on the extent of the damage. Overall, drivers can expect to pay anywhere from $300 to $800 for parts and labor to resolve this issue. However, it is important to note that labor rates can vary significantly based on location, vehicle make and model, and the expertise of the mechanic. It is recommended to obtain quotes from multiple auto repair shops to ensure a competitive price for the repair.

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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?

It’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 it’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 won’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 injector’s electrical circuit and cause a P1264 code, but this is less common than wiring or injector issues.

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