AutoCodes – Generic – P311E

P311E 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 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 1,711

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
Cost to Diagnose
FAQs
Comments
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Code P311E 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 - Cylinder 4 High Pressure Fuel Injector Low Side/High Side Electrical - AutoCodes.com — P311E 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?

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?

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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P311E 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 P311E code?

Need more information on how to fix the P311E code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P311E code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P311E BMW — Cylinder 4 High Pressure Fuel Injector Low Side/High Side Electrical
P311E MINI — Cylinder 4 High Pressure Fuel Injector Low Side/High Side Electrical

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 Code

1. What are the common symptoms of OBDII code P311E (Cylinder 4 High Pressure Fuel Injector Low Side/High Side Electrical)?

The common symptoms of P311E may include rough idling, misfiring, loss of power, and decreased fuel efficiency.

2. What are the possible causes of OBDII code P311E?

Possible causes of P311E include a faulty fuel injector, wiring issues, electrical problems, or a malfunctioning fuel injection control module.

3. How can I diagnose the cause of OBDII code P311E?

Diagnosing P311E involves conducting a visual inspection of the fuel injector and related wiring, performing electrical tests, and using a diagnostic scan tool to monitor the fuel injector's operation.

4. Can a DIYer repair OBDII code P311E at home?

Repairing P311E may require advanced diagnostic tools and expertise. It is recommended to consult a professional mechanic for an accurate diagnosis and proper repair.

5. Is it safe to drive with OBDII code P311E present?

Continuing to drive with P311E may lead to further engine damage or decreased performance. It is best to address the issue promptly to avoid potential costly repairs.

6. How much does it cost to repair OBDII code P311E?

The cost of repairing P311E can vary depending on the underlying cause and required repairs. It is advised to obtain multiple quotes from reputable mechanics to determine the most cost-effective solution.

7. Can a faulty fuel injector cause OBDII code P311E?

Yes, a faulty fuel injector, particularly in cylinder 4, can trigger code P311E due to low side or high side electrical issues affecting fuel delivery.

8. Are there any preventive maintenance tips to avoid OBDII code P311E?

Regularly servicing the fuel injection system, checking for wiring integrity, and using high-quality fuel can help prevent issues that may lead to P311E.

9. What is the difference between the low side and high side of a fuel injector in relation to OBDII code P311E?

The low side of a fuel injector controls the opening and closing of the injector, while the high side supplies the necessary voltage for fuel injection. Issues with either side can trigger P311E.

10. Can resetting the vehicle's ECU clear OBDII code P311E?

Resetting the ECU may temporarily clear the code, but if the underlying issue causing P311E is not addressed, the code is likely to reappear. It is crucial to diagnose and fix the root cause of the problem.