AutoCodes – BMW – P311E BMW

P311E BMW Code - Cylinder 4 High Pressure Fuel Injector Low Side/High Side Electrical

Quick Answer

The solenoid-controlled injection valve discharges a high-pressure spray into the combustion chamber. Common causes include Faulty Fuel Injector 4, Fuel Injector 4 harness is open or shorted, Fuel Injector 4 circuit poor electrical connection. 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: P311E BMW indicates Cylinder 4 High Pressure Fuel Injector Low Side/High Side Electrical.
Common causes: Common causes include Faulty Fuel Injector 4, Fuel Injector 4 harness is open or shorted, Fuel Injector 4 circuit poor electrical connection.
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 3,558

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 Jul 16, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P311E BMW Description

The solenoid-controlled injection valve discharges a high-pressure spray into the combustion chamber. The solenoid-controlled injection valve is a retracting-plunger valve characterized by a high level of flexibility in its spray-propagation pattern (angle and shape). The discharge orifices form the high-precision injection pattern. This provides even and consistent propagation. The retracting-plunger solenoid-controlled injection valve continues to maintain stable propagation properties, even at the temperatures and pressure levels encountered within the combustion chamber. Fuel is injected into the combustion chambers under high pressure (between 50 and 200 bar) during the intake and compression strokes. During the warm-up phase yet another, a minute quantity of fuel is injected to assist the catalytic converter to reach its effective operating temperature more quickly (catalytic converter heating). During cold starting, the fuel is sprayed during the compression stroke in multiple pulses. This strategy provides reliable cold-starts along with substantive improvements in the areas of pollutant emissions and fuel consumption.
The Digital Motor Electronics (DME) diagnosis monitors the activation of the high voltage side of the fuel injector. The Diagnostic Trouble Code (DTC) is detected when there is a short circuit between the high-voltage side and the low-voltage side.

OBDII Code P311E BMW - Cylinder 4 High Pressure Fuel Injector Low Side/High Side Electrical - AutoCodes.com — P311E BMW Code - Cylinder 4 High Pressure Fuel Injector Low Side/High Side Electrical

What does this mean?

What are the Possible Causes of the DTC P311E BMW?

Faulty Fuel Injector 4
Fuel Injector 4 harness is open or shorted
Fuel Injector 4 circuit poor electrical connection
Faulty Digital Motor Electronics (DME)

How to Fix the DTC P311E BMW?

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

BMW Diagnostic Trouble Code (DTC): 112404

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P311E BMW 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 P311E BMW Code

1. What are the common symptoms of OBDII code P311E in a BMW related to Cylinder 4 High Pressure Fuel Injector?

- Common symptoms include rough idling, engine misfires, loss of power, and potential increase in fuel consumption.

2. What are the possible causes of the P311E code indicating a low side/high side electrical issue with the Cylinder 4 fuel injector in a BMW?

- Causes may include a faulty fuel injector, wiring issues, poor electrical connections, or a problem with the fuel injector control module.

3. How can I diagnose the root cause of the P311E code in my BMW Cylinder 4 injector system?

- It is recommended to perform a thorough inspection of the injector wiring, connectors, and control module. Testing the injector itself for proper function is also crucial.

4. What are the repair options for resolving the Cylinder 4 High Pressure Fuel Injector Low Side/High Side Electrical issue in a BMW?

- Repairs may involve replacing the faulty fuel injector, repairing or replacing damaged wiring, ensuring proper electrical connections, or addressing issues with the injector control module.

5. Can I continue driving my BMW with the P311E code present in the Cylinder 4 injector system?

- It is not advisable to drive the vehicle with this issue unresolved, as it may lead to further engine damage or poor performance. Prompt diagnosis and repair are recommended.

6. Are there any maintenance tips to prevent the recurrence of the P311E code in a BMW?

- Regular maintenance, including checking and cleaning fuel injectors, inspecting wiring harnesses, and ensuring proper electrical connections, can help prevent issues leading to this code.

7. How can I reset the OBDII code P311E in my BMW after resolving the Cylinder 4 injector problem?

- The code can be reset using an OBDII scanner or by disconnecting the car's battery for a few minutes. Ensure the underlying issue has been fixed before resetting the code.

8. Is it possible for a DIY enthusiast to address the P311E code in a BMW, or should it be handled by a professional mechanic?

- While some may attempt basic checks like inspecting wiring and connectors, diagnosing and repairing the specific injector issue may require professional expertise to ensure proper resolution.

9. What is the typical cost of repairing the Cylinder 4 High Pressure Fuel Injector Low Side/High Side Electrical issue in a BMW?

- The cost can vary depending on the root cause of the problem, but it may involve expenses for parts, labor, and diagnostic services. Consulting with a mechanic for an accurate estimate is recommended.

10. How urgent is it to address the P311E code related to the Cylinder 4 fuel injector in a BMW?

- It is advisable to address the issue promptly to prevent potential engine damage, reduced fuel efficiency, and drivability issues. Delaying repairs may lead to more extensive and costly problems in the future.