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AutoCodes - Generic - P311B

P311B Code - Cylinder 3 High Pressure Fuel Injector Low Side/High Side Electrical

- Code Popularity: 424 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC P311B?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty Fuel Injector 3
  • Fuel Injector 3 harness is open or shorted
  • Fuel Injector 3 circuit poor electrical connection
  • Faulty Digital Motor Electronics (DME)
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How to Fix the DTC P311B?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P311B code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

Code P311B 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 P311B - Cylinder 3 High Pressure Fuel Injector Low Side/High Side Electrical - AutoCodes.com
P311B Code - Cylinder 3 High Pressure Fuel Injector Low Side/High Side Electrical

Need More Information on the Code?

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Information for Specific Makes

  • P311B BMW Cylinder 3 High Pressure Fuel Injector Low Side/High Side Electrical  📷
  • P311B MINI Cylinder 3 High Pressure Fuel Injector Low Side/High Side Electrical  📷

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Code P311B comments

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