AutoCodes – Buick – P0274 Buick

P0274 Buick Code - Cylinder 5 Injector Control Circuit High Voltage

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 Buick indicates Cylinder 5 Injector Control Circuit High Voltage.
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 291

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 Mar 23, 2024

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0274 Buick 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 shorted to voltage for greater than 2 s.

OBDII Code P0274 Buick - Cylinder 5 Injector Control Circuit High Voltage - AutoCodes.com — P0274 Buick Code - Cylinder 5 Injector Control Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0274 Buick?

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 Buick?

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 Buick 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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Need Help with the Code?

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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 Buick Code

1. What does the OBDII code P0274 mean on a Buick?

P0274 indicates a high voltage issue in the injector control circuit for cylinder 5, meaning the engine control module (ECM) has detected abnormal electrical readings.

2. What are the common symptoms of code P0274 in a Buick?

Symptoms may include rough idling, reduced engine performance, misfiring on cylinder 5, poor fuel economy, and the check engine light turning on.

3. What causes the P0274 code to appear?

Common causes include a faulty fuel injector, damaged wiring or connectors in the injector circuit, a malfunctioning ECM, or a short to voltage in the circuit.

4. Can I drive my Buick with the P0274 code?

Driving with this code is not recommended, as it can lead to poor engine performance, increased emissions, and potential damage to other components if left unresolved.

5. How do I diagnose a P0274 code on my Buick?

Start by inspecting the wiring and connectors for cylinder 5's injector, test the injector's resistance with a multimeter, and check for shorts or open circuits in the wiring.

6. How do I fix the P0274 code in a Buick?

Repairs may include replacing the faulty injector, repairing damaged wiring or connectors, or replacing the ECM if it's determined to be the root cause.

7. Can a clogged fuel injector cause the P0274 code?

No, a clogged injector typically causes performance issues, but P0274 specifically refers to an electrical problem, not a mechanical clog.

8. How much does it cost to fix a Buick with a P0274 code?

Repair costs vary but may range from $100 to $500, depending on whether the issue is a damaged wire, a faulty injector, or an ECM replacement.

9. Will clearing the P0274 code solve the issue?

Clearing the code without addressing the underlying issue will not fix the problem. The code will likely return if the root cause is not resolved.

10. Can a bad ECM trigger the P0274 code in a Buick?

Yes, a malfunctioning ECM can incorrectly detect or fail to regulate the injector circuit, leading to the P0274 code. However, this is less common than wiring or injector issues.