AutoCodes – BMW – P3156 BMW

P3156 BMW Code - Cylinder 3 High-Pressure Fuel Injector High Side Circuit High

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: P3156 BMW indicates Cylinder 3 High-Pressure Fuel Injector High Side Circuit High.
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 1,945

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 P3156 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 B+.

OBDII Code P3156 BMW - Cylinder 3 High-Pressure Fuel Injector High Side Circuit High - AutoCodes.com — P3156 BMW Code - Cylinder 3 High-Pressure Fuel Injector High Side Circuit High

What does this mean?

What are the Possible Causes of the DTC P3156 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 P3156 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): 110304

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P3156 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 P3156 BMW Code

1. What are common symptoms of OBDII code P3156 in a BMW related to the high-pressure fuel injector on cylinder 3?

The common symptoms of this code may include rough idling, engine misfires, loss of power, and potentially poor fuel efficiency.

2. What are some possible causes of OBDII code P3156 in a BMW?

Potential causes of this code may include a faulty high-pressure fuel injector, issues with the high side circuit, electrical problems, or a problem with the Engine Control Module (ECM).

3. How can I diagnose OBDII code P3156 in my BMW related to cylinder 3's high-pressure fuel injector?

To diagnose this issue, it is recommended to perform a thorough inspection of the high-pressure fuel injector on cylinder 3, check the wiring and connectors for any damage, and use a scan tool to analyze the high side circuit.

4. Can I continue driving my BMW with OBDII code P3156 present?

It is not recommended to continue driving your BMW with this code present, as it can lead to further damage to the engine and potentially cause safety concerns. It is advisable to address the issue promptly.

5. What are some repair tips for resolving OBDII code P3156 in a BMW?

Repair tips may include replacing the faulty high-pressure fuel injector on cylinder 3, repairing any damaged wiring or connectors, and resetting the fault code using a diagnostic tool after completing the repairs.

6. Is it possible to clear OBDII code P3156 in a BMW without addressing the underlying issue?

Clearing the code without addressing the underlying problem will likely result in the code reappearing once the issue is detected again. It is important to diagnose and fix the root cause of the problem.

7. How much does it typically cost to repair OBDII code P3156 in a BMW at a dealership or repair shop?

The cost of repairing this code can vary depending on the extent of the issue and the labor rates of the service provider. It is advisable to obtain quotes from multiple shops to compare prices.

8. Can a DIY enthusiast fix OBDII code P3156 in a BMW at home?

While some DIY enthusiasts may have the skills and tools to address this code at home, it is a complex issue that may require specialized equipment and knowledge. It is recommended to consult a professional mechanic for assistance.

9. How often does OBDII code P3156 related to cylinder 3's high-pressure fuel injector occur in BMW vehicles?

The occurrence of this specific code can vary among BMW vehicles, but issues related to high-pressure fuel injectors are not uncommon in modern vehicles with direct fuel injection systems.

10. Are there any preventive measures to avoid encountering OBDII code P3156 in a BMW in the future?

Regular maintenance, such as using high-quality fuel and following the manufacturer's recommended service intervals, can help prevent issues with high-pressure fuel injectors and reduce the likelihood of encountering this code.