AutoCodes – Mercury – P0274 Mercury

P0274 Mercury Code - Cylinder 5 Injector Circuit High

Quick Answer

The Engine Control Module (ECM) supplies voltage to each Fuel Injector on the high control circuits. 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 Mercury indicates Cylinder 5 Injector 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 234

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
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Code P0274 Mercury 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 P0274 Mercury - Cylinder 5 Injector Circuit High - AutoCodes.com — P0274 Mercury Code - Cylinder 5 Injector Circuit High

What does this mean?

What are the Possible Causes of the DTC P0274 Mercury?

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

How to Fix the DTC P0274 Mercury?

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

A 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 Mercury 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.

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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 Mercury Code

1. What does OBDII code P0274 mean for a Mercury vehicle?

P0274 indicates a high voltage issue in the cylinder 5 injector circuit, suggesting an electrical fault such as a short or failed injector.

2. What are the common symptoms of code P0274 on a Mercury?

Symptoms include rough idling, engine misfires, reduced fuel efficiency, poor acceleration, and potentially the check engine light illuminating.

3. What causes code P0274 on a Mercury?

Common causes include a faulty fuel injector, damaged wiring or connectors in the injector circuit, or issues with the powertrain control module (PCM).

4. Can I still drive my Mercury with code P0274 active?

Itâ€™s not recommended to drive long distances, as engine misfires and poor performance can lead to further damage or unsafe driving conditions.

5. How do I diagnose the P0274 code on a Mercury?

Start by inspecting the wiring and connectors for cylinder 5, checking for damage or corrosion. Then test the injector itself and the PCM for faults.

6. How do I fix code P0274 on a Mercury?

Repairs may include replacing the cylinder 5 injector, repairing or replacing damaged wiring or connectors, or reprogramming/replacing the PCM.

7. How much does it cost to fix code P0274 on a Mercury?

Costs vary, but injector replacements typically range from $200-$500, while wiring repairs or PCM replacements can cost more depending on the extent of the damage.

8. Can a dirty fuel injector cause code P0274?

A dirty injector is unlikely to cause this code specifically, as P0274 refers to an electrical circuit issue rather than a fuel delivery problem.

9. Will clearing the P0274 code solve the problem?

Clearing the code will turn off the check engine light temporarily but wonâ€™t fix the underlying issue causing the high voltage in the injector circuit.

10. How can I prevent code P0274 on my Mercury in the future?

Regular maintenance, including inspecting wiring and connectors for damage and ensuring injectors are functioning properly, can help prevent this issue.