P0204 Code - Injector Circuit Malfunction Cylinder 4

Quick Answer

The P0204 code indicates a malfunction in the injector circuit for cylinder 4 of the vehicle's engine. Common causes include Faulty fuel injector for cylinder 4, Wiring or connection issues in the injector circuit, Electrical problems such as a blown fuse or 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

P0204 indicates Injector Circuit Malfunction Cylinder 4.

Common causes

Common causes include Faulty fuel injector for cylinder 4, Wiring or connection issues in the injector circuit, Electrical problems such as a blown fuse or 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.

• Description
• Common Causes
• Symptoms
• How To Fix
• Cost to Fix
• Tech Notes
• FAQs
• Comments
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Common Causes of P0204

Symptoms of P0204

How to Fix P0204

Cost to Fix P0204

Tech Notes for P0204

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Code P0204 Information for Specific Makes

• P0204 Acura — No. 4 Cylinder Injector Circuit Malfunction
• P0204 BMW — Cylinder 4 Fuel Injector Circuit Open
• P0204 Buick — Cylinder 4 Injector Control Circuit
• P0204 Cadillac — Cylinder 4 Injector Control Circuit
• P0204 Chevrolet — Cylinder 4 Injector Control Circuit
• P0204 Chrysler — Fuel Injector 4 Circuit Open
• P0204 Dodge — Fuel Injector 4 Circuit Open
• P0204 Ford — Injector Circuit Malfunction Cylinder 4
• P0204 GMC — Cylinder 4 Injector Control Circuit
• P0204 Honda — No. 4 Cylinder Injector Circuit Malfunction
• P0204 Hyundai — Injector Circuit Open- Cylinder 4
• P0204 Isuzu — Injector 4 Control Circuit
• P0204 Jaguar — Injector Circuit Malfunction Cylinder 4
• P0204 Jeep — Fuel Injector 4 Circuit Open
• P0204 KIA — Injector Circuit Open- Cylinder 4
• P0204 Lexus — Injector Circuit Open Cylinder 4
• P0204 Lincoln — Injector Circuit Malfunction Cylinder 4
• P0204 Mazda — Injector Circuit Open Cylinder 4
• P0204 Mercedes-Benz — Injector Circuit/Open Cylinder 4
• P0204 Mercury — Injector Circuit Malfunction Cylinder 4
• P0204 MINI — Cylinder 4 Fuel Injector Circuit Open
• P0204 Mitsubishi — Injector Circuit Cylinder 4
• P0204 Nissan — Number 4 Fuel Injector Circuit Open
• P0204 Pontiac — Cylinder 4 Injector Control Circuit
• P0204 Saturn — Cylinder 4 Injector Control Circuit
• P0204 Volkswagen — Injector Circuit Open Cylinder 4

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 P0204 Code

1. What are common symptoms of OBDII code P0204 (Injector Circuit Malfunction Cylinder 4)?

- Common symptoms include rough idling, engine misfires, poor fuel efficiency, and potentially a noticeable decrease in engine performance.

2. What are the possible causes of OBDII code P0204?

- The code P0204 can be triggered by issues such as a faulty fuel injector in cylinder 4, wiring problems in the injector circuit, a malfunctioning injector driver in the engine control module (ECM), or a poor connection in the injector system.

3. How can I diagnose the cause of OBDII code P0204?

- To diagnose the cause of P0204, you may need to perform a thorough inspection of the injector in cylinder 4, check the wiring and connectors related to the injector circuit, and use a scan tool to monitor the injector's operation.

4. Can a dirty fuel injector cause OBDII code P0204?

- Yes, a dirty or clogged fuel injector in cylinder 4 can disrupt the injector circuit and trigger code P0204. Regular maintenance, such as using fuel injector cleaner, can help prevent this issue.

5. How should I repair OBDII code P0204?

- Repairing P0204 may involve cleaning or replacing the fuel injector in cylinder 4, repairing any damaged wiring or connectors in the injector circuit, or replacing the injector driver in the ECM if necessary.

6. Can driving with OBDII code P0204 cause further damage to the engine?

- Continuing to drive with code P0204 can potentially lead to more severe engine problems, such as increased fuel consumption, engine overheating, or damage to the catalytic converter. It is recommended to address the issue promptly.

7. Is it safe to reset the OBDII code P0204 without fixing the underlying issue?

- Resetting the code without addressing the root cause may temporarily turn off the check engine light, but the issue will likely resurface. It's important to diagnose and repair the problem to prevent further complications.

8. Can a faulty ECM cause OBDII code P0204?

- Yes, a malfunctioning ECM, particularly the injector driver within the ECM, can cause code P0204. If other potential causes have been ruled out, it may be necessary to inspect or replace the ECM.

9. How long does it take to repair OBDII code P0204?

- The time needed to repair P0204 can vary depending on the exact cause of the issue and the complexity of the repair. It could take anywhere from a few hours to a full day, depending on the extent of the problem.

10. Are there any preventive measures to avoid OBDII code P0204 in the future?

- Regular maintenance, such as using high-quality fuel, cleaning fuel injectors periodically, and ensuring proper wiring connections, can help prevent issues that may trigger code P0204 in the future.