AutoCodes – Generic – P0203

P0203 Code - Injector Circuit Malfunction Cylinder 3

Quick Answer

The Engine Control Module (ECM) supplies voltage to each fuel injector on the high control circuits. Common causes include Faulty Fuel Injector 3, Fuel Injector 3 harness is open or shorted, Fuel Injector 3 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: P0203 indicates Injector Circuit Malfunction Cylinder 3.
Common causes: Common causes include Faulty Fuel Injector 3, Fuel Injector 3 harness is open or shorted, Fuel Injector 3 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 47,629

How popular is this code, among other codes? Medium

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 Mar 23, 2024

Description
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code P0203 Description

The Engine Control Module (ECM) supplies voltage to each fuel injector on the high control circuits. The ECM energizes each fuel injector by grounding the low control circuit of the fuel injector. The ECM monitors the status of the fuel injector circuits. When a fuel injector circuit condition is detected by the ECM, the affected fuel injector(s) is disabled. The Diagnostic Trouble Code (DTC) will be set when the ECM detects the fuel injector control circuit is open for greater than 2 s.

OBDII Code P0203 - Injector Circuit Malfunction Cylinder 3 - AutoCodes.com — P0203 Code - Injector Circuit Malfunction Cylinder 3

What does this mean?

What are the Possible Causes of the DTC P0203?

Faulty Fuel Injector 3
Fuel Injector 3 harness is open or shorted
Fuel Injector 3 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0203?

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 does this mean?

Code Tech Notes

User Submitted Video

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0203 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 P0203 code?

Need more information on how to fix the P0203 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0203 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P0203 Acura — No. 3 Cylinder Injector Circuit Malfunction
P0203 BMW — Cylinder 3 Fuel Injector Circuit Open
P0203 Buick — Cylinder 3 Injector Control Circuit
P0203 Cadillac — Cylinder 3 Injector Control Circuit
P0203 Chevrolet — Cylinder 3 Injector Control Circuit
P0203 Chrysler — Fuel Injector 3 Circuit Open
P0203 Dodge — Fuel Injector 3 Circuit Open
P0203 Ford — Injector Circuit Malfunction Cylinder 3
P0203 GMC — Cylinder 3 Injector Control Circuit
P0203 Honda — No. 3 Cylinder Injector Circuit Malfunction
P0203 Hyundai — Injector Circuit Open- Cylinder 3
P0203 Isuzu — Injector 3 Control Circuit
P0203 Jaguar — Injector Circuit Malfunction Cylinder 3
P0203 Jeep — Fuel Injector 3 Circuit Open
P0203 KIA — Injector Circuit Open- Cylinder 3
P0203 Lexus — Injector Circuit Open Cylinder 3
P0203 Lincoln — Injector Circuit Malfunction Cylinder 3
P0203 Mazda — Injector Circuit Open Cylinder 3
P0203 Mercedes-Benz — Injector Circuit/Open Cylinder 3
P0203 Mercury — Injector Circuit Malfunction Cylinder 3
P0203 MINI — Cylinder 3 Fuel Injector Circuit Open
P0203 Mitsubishi — Injector Circuit Cylinder 3
P0203 Nissan — Number 3 Fuel Injector Circuit Open
P0203 Pontiac — Cylinder 3 Injector Control Circuit
P0203 Saturn — Cylinder 3 Injector Control Circuit
P0203 Volkswagen — Injector Circuit Open Cylinder 3

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 P0203 Code

1. What are the common symptoms of OBDII code P0203 (Injector Circuit Malfunction Cylinder 3)?

- Common symptoms include rough idling, engine misfires, loss of power, and potentially increased fuel consumption.

2. What are the possible causes of OBDII code P0203?

- The code P0203 can be caused by issues such as a faulty fuel injector in cylinder 3, a wiring problem in the injector circuit, or a problem with the engine control module (ECM).

3. How can I diagnose the cause of OBDII code P0203?

- Diagnosis typically involves checking the fuel injector in cylinder 3 for proper operation, inspecting the wiring and connectors in the injector circuit, and using a scan tool to analyze the ECM data.

4. Can I continue to drive my vehicle with OBDII code P0203?

- It is not recommended to drive your vehicle with code P0203, as it can lead to engine performance issues and potential damage if left unresolved.

5. How can I repair OBDII code P0203?

- Repairing code P0203 may involve replacing the fuel injector in cylinder 3, repairing any damaged wiring or connectors, or reprogramming the ECM if necessary.

6. Is it possible for a DIY enthusiast to fix OBDII code P0203 at home?

- While some experienced DIY enthusiasts may be able to address simpler causes of P0203, it is often best to have a professional mechanic diagnose and repair the issue due to the complexity of the fuel injection system.

7. Are there any preventive maintenance tips to avoid OBDII code P0203?

- Regularly servicing your vehicle, using high-quality fuel, and addressing any engine performance issues promptly can help prevent OBDII code P0203 from occurring.

8. Can a dirty fuel injector cause OBDII code P0203?

- Yes, a dirty or clogged fuel injector in cylinder 3 can cause insufficient fuel delivery, leading to the trigger of code P0203.

9. How much does it typically cost to repair OBDII code P0203 at a repair shop?

- The cost of repairing code P0203 can vary depending on the exact cause, but it may range from $150 to $500 or more, including parts and labor.

10. Will resetting the OBDII code P0203 clear the issue permanently?

- Resetting the code may temporarily clear the check engine light, but if the underlying issue causing P0203 is not addressed, the code is likely to reappear.