AutoCodes – Generic – P310B

P310B Code - Cylinder 1 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 1, Fuel Injector 1 harness is open or shorted, Fuel Injector 1 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: P310B indicates Cylinder 1 High Pressure Fuel Injector Low Side/High Side Electrical.
Common causes: Common causes include Faulty Fuel Injector 1, Fuel Injector 1 harness is open or shorted, Fuel Injector 1 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 3,794

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 P310B 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 P310B - Cylinder 1 High Pressure Fuel Injector Low Side/High Side Electrical - AutoCodes.com — P310B Code - Cylinder 1 High Pressure Fuel Injector Low Side/High Side Electrical

What does this mean?

What are the Possible Causes of the DTC P310B?

Faulty Fuel Injector 1
Fuel Injector 1 harness is open or shorted
Fuel Injector 1 circuit poor electrical connection
Faulty Digital Motor Electronics (DME)

How to Fix the DTC P310B?

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 P310B 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 P310B code?

Need more information on how to fix the P310B code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P310B code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P310B BMW — Cylinder 1 High Pressure Fuel Injector Low Side/High Side Electrical
P310B MINI — Cylinder 1 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 P310B Code

1. What are the common symptoms of OBDII code P310B?

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

2. What could cause OBDII code P310B to trigger?

The code P310B is typically triggered by issues with the electrical circuit of the high-pressure fuel injector for cylinder 1, such as a faulty injector, wiring problems, or a poor connection.

3. How can I diagnose the cause of OBDII code P310B?

Diagnosis usually involves inspecting the high-pressure fuel injector for cylinder 1, checking the wiring harness for any damage, and verifying the electrical connections are secure and free of corrosion.

4. Can a dirty fuel injector cause OBDII code P310B?

While a dirty fuel injector may not directly trigger code P310B, it can contribute to poor injector performance, which may lead to electrical issues and eventually trigger the code.

5. What are some repair tips for resolving OBDII code P310B?

Repair tips may include cleaning the electrical connectors, checking the injector's resistance, testing the injector's operation, or replacing the injector if necessary.

6. Is it safe to continue driving with OBDII code P310B present?

It is not recommended to drive with code P310B present, as it can lead to potential engine performance issues and further damage if left unaddressed.

7. Can a DIY enthusiast fix OBDII code P310B at home?

Depending on the individual's skill level and access to tools, some DIY enthusiasts may be able to address code P310B at home by following repair procedures and using diagnostic equipment.

8. How much does it typically cost to repair OBDII code P310B at a mechanic?

The cost of repairing code P310B can vary depending on the root cause, but it may range from $100 to $500 or more, including parts and labor.

9. Will resetting the check engine light clear OBDII code P310B permanently?

Resetting the check engine light may temporarily clear the code, but if the underlying issue is not fixed, the code is likely to reappear once the vehicle is driven and the system runs its diagnostic checks.

10. Are there any recalls related to OBDII code P310B for specific vehicle models?

It is essential to check with the vehicle manufacturer or authorized dealerships to inquire about any recalls or technical service bulletins related to code P310B affecting specific vehicle models.