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P0273 Ford Code - Cylinder 5 Injector Circuit Low

Quick Answer

The P0273 Ford diagnostic trouble code (DTC) specifically refers to a fault detected in the Cylinder 5 Injector Circuit, indicating that there is a low voltage condition present. Common causes include Faulty Injector: The most common cause of the P0273 code is a malfunctioning injector in cylinder 5, The injector may be clogged, stuck open or closed, or experiencing electrical issues, Wiring Issues: Corrosion, fraying, or short circuits in the wiring harness connecting the injector to the ECM can disrupt the voltage signal, triggering the code. 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
P0273 Ford indicates Cylinder 5 Injector Circuit Low.
Common causes
Common causes include Faulty Injector: The most common cause of the P0273 code is a malfunctioning injector in cylinder 5, The injector may be clogged, stuck open or closed, or experiencing electrical issues, Wiring Issues: Corrosion, fraying, or short circuits in the wiring harness connecting the injector to the ECM can disrupt the voltage signal, triggering the code.
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 08, 2024
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Code P0273 Ford Description

The P0273 Ford diagnostic trouble code (DTC) specifically refers to a fault detected in the Cylinder 5 Injector Circuit, indicating that there is a low voltage condition present. In a vehicle's fuel injection system, each cylinder has its own injector responsible for delivering the precise amount of fuel needed for combustion. When the Engine Control Module (ECM) detects a low voltage signal from the injector in cylinder 5, it triggers the P0273 code. This issue can negatively impact the vehicle's performance, fuel efficiency, and emissions output.

OBDII Code P0273 Ford - Cylinder 5 Injector Circuit Low
P0273 Ford Code - Cylinder 5 Injector Circuit Low

Common Causes of P0273 Ford

  1. Faulty Injector: The most common cause of the P0273 code is a malfunctioning injector in cylinder 5. The injector may be clogged, stuck open or closed, or experiencing electrical issues.
  2. Wiring Issues: Corrosion, fraying, or short circuits in the wiring harness connecting the injector to the ECM can disrupt the voltage signal, triggering the code.
  3. ECM Malfunction: A malfunctioning ECM can incorrectly interpret the voltage signal from the injector, leading to a low voltage condition.
  4. Poor Electrical Connection: Loose or corroded electrical connections at the injector or ECM can cause voltage drop and trigger the code.
  5. Fuel System Problems: Issues with fuel pressure, fuel quality, or fuel delivery can also impact the injector's performance and trigger the code.

Symptoms of P0273 Ford

  1. Engine Misfires: Cylinder 5 injector circuit low can cause misfires, resulting in rough running or shaking of the engine.
  2. Hesitation and Loss of Power: The vehicle may exhibit hesitation during acceleration and a noticeable loss of power.
  3. Rough Idle: A rough or unstable idle may be present when the engine is running.
  4. Decreased Fuel Efficiency: The vehicle may experience decreased fuel efficiency due to the improper fuel delivery in cylinder 5.
  5. Check Engine Light: The illumination of the check engine light on the dashboard is a common symptom associated with the P0273 code.

How to Fix P0273 Ford

  1. Diagnose the Issue: Use a diagnostic scanner to retrieve the trouble code and perform tests to pinpoint the exact cause of the low voltage condition in cylinder 5.
  2. Inspect the Injector: Check the injector in cylinder 5 for proper operation, including resistance, continuity, and fuel delivery.
  3. Check Wiring: Inspect the wiring harness for any damage, corrosion, or loose connections. Repair or replace any faulty wiring as needed.
  4. Test the ECM: Verify the ECM's functionality by checking for proper voltage signals and communication with the injector.
  5. Repair or Replace Components: Depending on the diagnosis, repair or replace the faulty injector, wiring, or ECM to resolve the P0273 code.

Cost to Fix P0273 Ford

The cost of repairing the Cylinder 5 Injector Circuit Low issue can vary depending on the extent of the problem, the need for replacement parts, and labor costs. Typically, the repair cost for this issue can range from $150 to $500, including parts and labor. However, the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It is recommended to obtain quotes from multiple repair shops to get a more accurate estimate for resolving the P0273 code.

What does this mean?

Tech Notes for P0273 Ford

A clogged or partially clogged fuel injector can cause this code. Start by performing an injector flush before replacing the injector.

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Information for Specific Ford Models

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 P0273 Ford Code

1. What does the OBDII code P0273 mean for a Ford vehicle?

P0273 indicates a "Cylinder 5 Injector Circuit Low," meaning the powertrain control module (PCM) has detected a low voltage or signal issue in the fuel injector circuit for cylinder 5.

2. What are the symptoms of code P0273 in a Ford?

Symptoms can include rough idling, engine misfires, reduced fuel efficiency, lack of power, poor acceleration, and in some cases, the engine may not start.

3. What causes the P0273 code on a Ford vehicle?

Common causes include a faulty fuel injector, damaged wiring or connectors in the injector circuit, a malfunctioning PCM, or a poor electrical ground connection.

4. Can I drive my Ford with a P0273 code?

While the vehicle may still run, driving with this code can lead to poor performance, increased fuel consumption, and potential engine damage over time. It’s best to address the issue promptly.

5. How do I diagnose the P0273 code on a Ford?

Start by inspecting the wiring and connectors for cylinder 5’s fuel injector for damage or corrosion. Use a multimeter to check for proper voltage and continuity. If the wiring is fine, test the injector itself and the PCM.

6. Can a dirty fuel injector cause a P0273 code?

No, a dirty fuel injector typically causes performance issues but not an electrical circuit code like P0273. The issue is more likely related to electrical wiring, connectors, or the injector’s internal circuitry.

7. How do I fix the P0273 code on a Ford?

Repairs may involve replacing a faulty fuel injector, repairing damaged wiring or connectors, cleaning corroded connections, or in rare cases, replacing the PCM.

8. How much does it cost to fix the P0273 code on a Ford?

Repair costs can vary. Replacing a fuel injector typically costs $150–$300, while wiring repairs may cost less. PCM replacement can be more expensive, ranging from $500–$1,500.

9. Will clearing the code fix the P0273 issue in my Ford?

Clearing the code will turn off the check engine light temporarily, but it won’t fix the root cause. The issue must be properly diagnosed and repaired to prevent the code from returning.

10. Can a bad PCM cause the P0273 code on a Ford?

Yes, although it’s rare, a malfunctioning PCM can cause the P0273 code by failing to properly control the injector circuit. Always rule out wiring and injector issues first.

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