Code Definition

P310B — Low Pressure Fuel Regulation

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Audi

About P310B

P310B is a manufacturer-specific powertrain diagnostic trouble code recorded for Audi vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P310B is stored, the module has detected a signal or supply voltage lower than the expected operating range.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

P310B is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The Engine Control Module (ECM) monitors low pressure fuel system operation by comparing the actual fuel pressure signal from the low pressure fuel sensor to the specified target value. DTC P310B is set when the ECM detects that the low pressure fuel system cannot regulate fuel pressure within the permissible tolerance, being either too low, too high, or unstable, despite correct control of the fuel pump and regulating components. The low pressure pump on Audi direct injection platforms is typically driven through a dedicated fuel pump control module that varies pump speed in response to ECM d...

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