AutoCodes – Mercedes-Benz – P0273 Mercedes-Benz

P0273 Mercedes-Benz Code - Cylinder 5 Injector 'A Circuit Low

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: P0273 Mercedes-Benz indicates Cylinder 5 Injector 'A Circuit Low.
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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 4,355

How popular is this code, among other codes? Low

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 Jun 02, 2022

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P0273 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 P0273 Mercedes-Benz - Cylinder 5 Injector 'A Circuit Low - AutoCodes.com — P0273 Mercedes-Benz Code - Cylinder 5 Injector 'A Circuit Low

What does this mean?

What are the Possible Causes of the DTC P0273 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 P0273 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 = 0322 The injection valve output stage of cylinder 5 detects a short circuit to ground. (P0273)

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 P0273 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 P0273 Mercedes-Benz code?

Need more information on how to fix the P0273 Mercedes-Benz code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0273 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 P0273 Mercedes-Benz Code

1. What are the common symptoms of OBDII code P0273 in a Mercedes-Benz related to Cylinder 5 Injector 'A Circuit Low?

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

2. What are the potential causes of OBDII code P0273 in a Mercedes-Benz?

- The code P0273 typically indicates issues with the Cylinder 5 Injector 'A Circuit Low, which can be caused by a faulty fuel injector, wiring issues, or a problem with the Engine Control Module (ECM).

3. How can I diagnose the cause of OBDII code P0273 in my Mercedes-Benz?

- To diagnose the cause of the code P0273, you can perform a visual inspection of the injector and its wiring, check for any loose connections or damaged wires, conduct a fuel injector resistance test, and use a scan tool to monitor the injector's performance.

4. What are some repair tips for fixing OBDII code P0273 in a Mercedes-Benz?

- Repair tips may include replacing the faulty fuel injector, repairing any damaged wiring or connectors, resetting the ECM after repairs, and conducting a thorough inspection of the entire fuel injection system for any other potential issues.

5. Can driving with OBDII code P0273 in a Mercedes-Benz cause further damage to the vehicle?

- Continuing to drive with code P0273 can potentially lead to further engine damage, reduced fuel efficiency, and increased emissions. It is recommended to address the issue promptly to prevent any additional problems.

6. Will resetting the OBDII code P0273 in a Mercedes-Benz make it go away permanently?

- Resetting the code may temporarily clear the warning light, but if the underlying issue causing code P0273 is not addressed, the code is likely to reappear once the ECM detects the problem again.

7. Is it safe to drive my Mercedes-Benz with OBDII code P0273 if the engine seems to be running fine?

- It is not recommended to drive the vehicle with code P0273, even if the engine appears to be running normally. Ignoring the issue could lead to more severe problems and potentially put the engine at risk.

8. How much does it cost to repair OBDII code P0273 in a Mercedes-Benz at a dealership or a repair shop?

- The cost of repairing code P0273 can vary depending on the exact cause of the issue, the labor rates of the repair facility, and the cost of any necessary parts. It is advisable to obtain quotes from different shops for an accurate estimate.

9. Can a DIY enthusiast fix OBDII code P0273 in a Mercedes-Benz at home?

- While some DIY enthusiasts may have the skills and tools to address the issue causing code P0273, it is a complex repair that may require specialized knowledge and equipment. If unsure, it is best to consult a professional mechanic.

10. How often does OBDII code P0273 occur in Mercedes-Benz vehicles, and is it a common problem?

- Code P0273 related to Cylinder 5 Injector 'A Circuit Low can occur in Mercedes-Benz vehicles, but it is not as common as some other OBDII codes. Proper maintenance and timely inspections can help prevent this issue.