AutoCodes – Mercedes-Benz – P0280 Mercedes-Benz

P0280 Mercedes-Benz Code - Cylinder 7 Injector Circuit High

Quick Answer

Code P0280 is triggered when the Engine Control Module (ECM) detects a high voltage in the Fuel Injector 7 Circuit. Common causes include Dirty Fuel Injector 7, Faulty Fuel Injector 7, Plugged Fuel Injector 7. 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: P0280 Mercedes-Benz indicates Cylinder 7 Injector Circuit High.
Common causes: Common causes include Dirty Fuel Injector 7, Faulty Fuel Injector 7, Plugged Fuel Injector 7.
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 3,837

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 P0280 Mercedes-Benz Description

Code P0280 is triggered when the Engine Control Module (ECM) detects a high voltage in the Fuel Injector 7 Circuit. During normal conditions, the ECM turns the Fuel Injectors ON and OFF in the Fuel Injection System.

OBDII Code P0280 Mercedes-Benz - Cylinder 7 Injector Circuit High - AutoCodes.com — P0280 Mercedes-Benz Code - Cylinder 7 Injector Circuit High

What does this mean?

What are the Possible Causes of the DTC P0280 Mercedes-Benz?

Dirty Fuel Injector 7
Faulty Fuel Injector 7
Plugged Fuel Injector 7
Fuel injector 7 harness is open or shorted
Fuel injector 7 circuit poor electrical connection

How to Fix the DTC P0280 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

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 P0280 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 P0280 Mercedes-Benz code?

Need more information on how to fix the P0280 Mercedes-Benz code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0280 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 P0280 Mercedes-Benz Code

1. What does the OBDII code P0280 mean on a Mercedes-Benz?

P0280 indicates a "Cylinder 7 Injector Circuit High" fault, meaning the fuel injector circuit for cylinder 7 is experiencing higher-than-expected voltage.

2. What are the common symptoms of code P0280 in a Mercedes-Benz?

Symptoms may include rough idling, misfires, reduced engine performance, poor fuel economy, and an illuminated check engine light.

3. What causes the P0280 code on a Mercedes-Benz?

Common causes include a faulty fuel injector, damaged or corroded wiring, a malfunctioning injector driver in the ECM, or a poor electrical connection.

4. Can I drive my Mercedes-Benz with a P0280 code?

Driving with a P0280 code is not recommended, as it can lead to further engine damage, reduced performance, and increased emissions.

5. How do I diagnose a P0280 code on a Mercedes-Benz?

Diagnosis involves checking the injector wiring and connectors for damage, testing the injector with a multimeter, and ensuring the ECM is functioning properly.

6. How do I fix the P0280 code on my Mercedes-Benz?

Repairs may include replacing the faulty injector, repairing damaged wiring or connectors, or reprogramming/replacing the ECM if necessary.

7. How much does it cost to repair a P0280 code on a Mercedes-Benz?

Costs can vary widely, from $100-$300 for wiring repairs to $500-$1,000 or more for fuel injector replacement or ECM repair.

8. Can a dirty fuel injector cause the P0280 code in a Mercedes-Benz?

Yes, a clogged or dirty injector can cause improper operation and trigger the P0280 code.

9. What tools are needed to troubleshoot a P0280 code on a Mercedes-Benz?

Tools include an OBDII scanner, a multimeter for checking electrical circuits, and possibly a noid light to test injector pulse signals.

10. Can a weak battery cause the P0280 code in a Mercedes-Benz?

A weak battery is unlikely to directly cause a P0280 code, but low system voltage can sometimes contribute to electrical issues affecting the injector circuit.