AutoCodes – BMW – P3155 BMW

P3155 BMW Code - Cylinder 3 High-Pressure Fuel Injector High Side Circuit Low

Quick Answer

The solenoid-controlled injection valve discharges a high-pressure spray into the combustion chamber. Common causes include Faulty Fuel Injector 3, Fuel Injector 3 harness is open or shorted, Fuel Injector 3 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: P3155 BMW indicates Cylinder 3 High-Pressure Fuel Injector High Side Circuit Low.
Common causes: Common causes include Faulty Fuel Injector 3, Fuel Injector 3 harness is open or shorted, Fuel Injector 3 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 685

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 P3155 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 to ground.

OBDII Code P3155 BMW - Cylinder 3 High-Pressure Fuel Injector High Side Circuit Low - AutoCodes.com — P3155 BMW Code - Cylinder 3 High-Pressure Fuel Injector High Side Circuit Low

What does this mean?

What are the Possible Causes of the DTC P3155 BMW?

Faulty Fuel Injector 3
Fuel Injector 3 harness is open or shorted
Fuel Injector 3 circuit poor electrical connection
Faulty Digital Motor Electronics (DME)

How to Fix the DTC P3155 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): 110301

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P3155 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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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 P3155 BMW Code

1. What are the common symptoms of OBDII code P3155 in a BMW?

Symptoms may include rough idling, reduced engine performance, misfires, and potentially an illuminated check engine light.

2. What could be causing the OBDII code P3155 in a BMW?

The code P3155 typically indicates a fault with the high-pressure fuel injector in cylinder 3, such as a wiring issue, a faulty injector, or a problem with the fuel injector control module.

3. How can I diagnose the root cause of OBDII code P3155 in my BMW?

Diagnosing the issue may involve performing a visual inspection of the injector and its wiring, checking for continuity in the circuit, testing the fuel injector control module, and using a scan tool to monitor injector operation.

4. Is it safe to drive my BMW with OBDII code P3155 present?

It is not recommended to drive the vehicle with code P3155 present, as it can lead to poor engine performance, potential damage to the engine, and increased fuel consumption.

5. How can I repair OBDII code P3155 in my BMW?

Repairing the code may involve replacing the high-pressure fuel injector in cylinder 3, repairing any damaged wiring, or replacing the fuel injector control module if necessary.

6. Can a DIY enthusiast fix OBDII code P3155 in a BMW?

While some experienced DIYers may be able to address the issue themselves, diagnosing and repairing high-pressure fuel injector problems often require specialized tools and expertise, so professional assistance is recommended.

7. How much does it typically cost to repair OBDII code P3155 in a BMW?

The cost of repairing code P3155 can vary depending on the extent of the damage and the specific components that need replacing, but it may range from a few hundred to over a thousand dollars.

8. Will resetting the check engine light resolve OBDII code P3155 in a BMW?

Simply resetting the check engine light will not fix the underlying issue causing code P3155. It is important to diagnose the problem, address the root cause, and clear the code properly to prevent it from returning.

9. What happens if OBDII code P3155 in a BMW is left untreated?

Ignoring code P3155 can lead to further engine damage, reduced fuel efficiency, and potential safety hazards, so it is crucial to address the issue promptly.

10. Are there any preventative measures to avoid OBDII code P3155 in a BMW?

Regular maintenance, such as using high-quality fuel and following recommended service intervals, can help prevent issues with high-pressure fuel injectors that may trigger code P3155.