AutoCodes – Generic – P3155

P3155 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 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 1,266

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

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

What does this mean?

What are the Possible Causes of the DTC P3155?

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?

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 P3155 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 P3155 code?

Need more information on how to fix the P3155 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P3155 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

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

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 Code

1. What does the OBDII code P3155 mean?

P3155 indicates that the high-pressure fuel injector circuit for Cylinder 3 is detecting a low voltage or open circuit condition.

2. What are the common symptoms of code P3155?

Symptoms may include poor engine performance, rough idling, misfires, reduced fuel efficiency, or difficulty starting the engine.

3. What causes code P3155 to be triggered?

Possible causes include a faulty fuel injector, damaged wiring or connectors in the injector circuit, a malfunctioning engine control module (ECM), or a blown fuse.

4. Can I drive with a P3155 code?

Driving with this code is not recommended, as it can lead to poor engine performance and potentially cause further damage to the engine or fuel system.

5. How do you diagnose code P3155?

Diagnosis typically involves inspecting the wiring and connectors for Cylinder 3's fuel injector, testing the injector for proper function, and verifying power and ground signals.

6. How do you fix code P3155?

Repairs may include replacing the faulty fuel injector, repairing or replacing damaged wiring or connectors, or addressing any issues with the ECM.

7. Could a bad ECM cause code P3155?

Yes, a malfunctioning ECM can fail to properly control the injector circuit and trigger this code, but this is less common than wiring or injector issues.

8. What tools are needed to fix code P3155?

Youâ€™ll need a diagnostic scanner, a multimeter to test electrical components, and possibly specialized tools for removing and installing fuel injectors.

9. How much does it cost to repair code P3155?

The cost varies depending on the problem. Replacing a fuel injector can range from $200 to $600, while wiring repairs or ECM replacements may cost more.

10. Can a dirty fuel injector cause code P3155?

A dirty injector typically causes performance issues but is unlikely to trigger this specific code, which relates to an electrical circuit problem.