AutoCodes – Mercedes-Benz – P0274 Mercedes-Benz

P0274 Mercedes-Benz Code - Cylinder 5 Injector 'A' Circuit High

Quick Answer

This fault code is stored in the Engine Control Module (ECM) when the injector control circuit does not behave as expected. Common causes include Dirty Fuel Injector 5, Faulty Fuel Injector 5, Plugged Fuel Injector 5. 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: P0274 Mercedes-Benz indicates Cylinder 5 Injector 'A' Circuit High.
Common causes: Common causes include Dirty Fuel Injector 5, Faulty Fuel Injector 5, Plugged Fuel Injector 5.
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 3,467

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Jun 02, 2022

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0274 Mercedes-Benz Description

This fault code is stored in the Engine Control Module (ECM) when the injector control circuit does not behave as expected. The ECM uses the induced voltage from the injector to indicate that the fuel injector circuit is operating correctly electrically. It does not signal the mechanical condition of the injector. When the ECM opens the ground circuit for an injector, to cease current flow, a voltage is induced into the winding. This voltage shows the electrical integrity of the injector and associated wiring. Absence of this induced voltage results in a fault code being stored in the ECM.

OBDII Code P0274 Mercedes-Benz - Cylinder 5 Injector 'A' Circuit High - AutoCodes.com — P0274 Mercedes-Benz Code - Cylinder 5 Injector 'A' Circuit High

What does this mean?

What are the Possible Causes of the DTC P0274 Mercedes-Benz?

Dirty Fuel Injector 5
Faulty Fuel Injector 5
Plugged Fuel Injector 5
Fuel injector 5 harness is open or shorted
Fuel injector 5 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0274 Mercedes-Benz?

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

Mercedes Benz Code = 0321 The injection valve output stage of cylinder 5 detects a short circuit to positive. (P0274)

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

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0274 Mercedes-Benz 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 P0274 Mercedes-Benz code?

Need more information on how to fix the P0274 Mercedes-Benz code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0274 Mercedes-Benz code diagnosed by a professional: Find a repair shop in your area

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 P0274 Mercedes-Benz Code

1. What are common symptoms of OBDII code P0274 in a Mercedes-Benz related to the Cylinder 5 Injector 'A' Circuit High?

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

2. What are some possible causes of the OBDII code P0274 in a Mercedes-Benz indicating an issue with the Cylinder 5 Injector 'A' Circuit High?

- Possible causes can include a faulty fuel injector, wiring issues in the injector circuit, a poor electrical connection, or a problem with the Engine Control Module (ECM).

3. How can I diagnose the OBDII code P0274 in my Mercedes-Benz pointing to Cylinder 5 Injector 'A' Circuit High?

- Diagnosis typically involves using an OBDII scanner to confirm the code, conducting a visual inspection of the injector and its wiring, and performing tests to check for proper injector operation.

4. What are the recommended repair tips for resolving the OBDII code P0274 in a Mercedes-Benz related to the Cylinder 5 Injector 'A' Circuit High?

- Repair tips may include checking and cleaning the injector connector, testing the injector resistance, inspecting the wiring for damage, and potentially replacing the faulty injector if necessary.

5. Can driving with the OBDII code P0274 in a Mercedes-Benz signaling Cylinder 5 Injector 'A' Circuit High cause further damage?

- Continuing to drive with this code can potentially lead to more severe engine issues, such as damage to the catalytic converter or other components, so it's best to address the problem promptly.

6. Is it safe to clear the OBDII code P0274 in a Mercedes-Benz indicating an issue with the Cylinder 5 Injector 'A' Circuit High and ignore it?

- While clearing the code may temporarily turn off the Check Engine Light, it's crucial to address the underlying issue causing the fault code to prevent potential engine performance problems.

7. How much does it typically cost to repair the OBDII code P0274 in a Mercedes-Benz related to the Cylinder 5 Injector 'A' Circuit High?

- Repair costs can vary depending on the exact cause of the issue, but expenses may include parts such as a new injector, labor for diagnosis and repair, and potential additional components if needed.

8. Are there any preventive measures to avoid encountering the OBDII code P0274 in a Mercedes-Benz due to Cylinder 5 Injector 'A' Circuit High in the future?

- Regular maintenance, such as using high-quality fuel and keeping up with scheduled tune-ups, can help prevent issues with fuel injectors and their circuits that may trigger this fault code.