No. 2311.5 Service Bulletin/Repair Instructions

Bulletin #: 2311.5
Advanced Technical Information
Part ID: 2066
2
992 2WD – DME Fault P310B00 – ‘Fuel Low Pressure – Implausible’

Vehicles Affected

Models
Model Year
Model Type
VIN Range
Vehicle-Specific Equipment
911
2021 - 2024
992110 (Carrera)

992120 (C2S)

992140 (C2GTS)

992150 (Carrera T)

992310 (Carrera Cab)

992320 (C2S Cab)

992340 (C2GTS Cab)

992810 (GT3)

992820 (GT3 Touring)
n/a
n/a
Revision History

Revision
Release Date
Changes
0
May 5, 2023
Original document
1
December 14, 2023
Update of Model Types, Technical Background, Service Information
2
January 2, 2024
Update of part number
3
January 4, 2024
Update of Service Information
4
April 1, 2024
Update of Service Information
5
January 27, 2026
Update of MY
Condition

Customer complains of a check-engine light resulting from fault “P310B00- Fuel low pressure – implausible” in the

DME control unit.
AfterSales
Jan 27, 2026

Page 1 of 3
Bulletin #: 2311.5
Advanced Technical Information
Part ID: 2066
2
Technical Background

The diagnostic responsible for this fault monitors supply deviation within a finite time between the demanded or

target low-pressure requested of the low-pressure fuel pump and that of the actual supplied quantity to meet the

request, as correlated to pressure. In some instances, manufacturing tolerances for the low-pressure pump result

in the actual supplied fuel quantity exceeding the DME’s requested quantity, in other words, the pump’s operation

is ‘too effective.’ By consulting the Vehicle Analysis Log (VAL) containing the fault it is possible to see if the supplied

fuel quantity exceeded the requested quantity in the low-pressure system to cause the fault.
Figure 1

In the example provided below of Figure 2, with imperial units provided, it is apparent the excess low-pressure fuel

supply caused the fault. Specifically, the value “B220_Fuel pressure actual value” of 10653.7 lbf/ft2 exceeds

“B221_Fuel low pressure setpoint” of 10442.7 lbf/ft2. This deviation occurred despite the DME regulating the demand downwards (-) by 1948.6 lbf/ft² or 14.99% to compensate for the excess supply, but the regulation could not

compensate enough to prevent the fault.
Figure 2 - FC: P310B00 Environmental Data Values

If the fault data is consistent with the condition exemplified in Figure 1, please replace the fuel pump, NOT the fuel

pressure sensor.

A software update to correct the diagnostic boundary parameters is available for GT3.
AfterSales
Jan 27, 2026

Page 2 of 3
2
Bulletin #: 2311.5
Advanced Technical Information
Part ID: 2066
Service Information

For Non-GT3 Models

1.

Follow the instructions from Guided Fault Finding to rule out any other possible fault causes.

2.

Referring to Figure 2. Identify measurement values for XX_Adaption value for low fuel pressure and A260_

Fuel pump control unit activation.

3.

Follow WM 206619 – Removing and installing fuel pump to replace the fuel pump.

4.

Verify the repair by monitoring the low-pressure fuel delivery under the engine operating parameters of the

fault’s environmental data.

For GT3 Models

1.
Perform DME programming with PIWIS Tester version 42.600.030 or newer Target DME Porsche Part

numbers from table below:

Model year
Porsche Part Number
DME SW Version
GT3 ULEV MT
2022, 2023
9GT.906.022.EA
0001
GT3 ULEV MT
2024
9GT.906.022.ED
0001
GT3 ULEV PDK
2022, 2023
9GT.906.022.DQ
0001
GT3 ULEV PDK
2024
9GT.906.022.EC
0001
Warranty

As always, please document the repair completely in PQIS.

For this repair, please code the “cause” as follows:

Cause location:

2066 Fuel pump

Cause symptom:

5062 Pressure too high

Use the following troubleshooting labor operation:

20660175

Fuel pump check

20661950

Fuel pump remove and reinstall
Search Items

992, 911, GT3, Fuel, Pressure, P310B00 – ‘Fuel low pressure – implausible’

Important Notice: Technical Bulletins issued by Porsche Cars North America, Inc. are intended only for use by professional automotive technicians who have attended Porsche service training courses. They are

written to inform those technicians of conditions that may occur on some Porsche vehicles, or to provide information that could assist in the proper servicing of a vehicle. Porsche special tools may be necessary in

order to perform certain operations identified in these bulletins. Use of tools and procedures other than those Porsche recommends in these bulletins may be detrimental to the safe operation of your vehicle, and

may endanger the people working on it. Properly trained Porsche technicians have the equipment, tools, safety instructions, and know-how to do the job properly and safely. Part numbers listed in these bulletins

are for reference only. The work procedures updated electronically in the Porsche PIWIS diagnostic and testing device take precedence and, in the event of a discrepancy, the work procedures in the PIWIS Tester

are the ones that must be followed.
A15700

©2026 Porsche Cars North America, Inc.
AfterSales
Jan 27, 2026

Page 3 of 3

Bestseller No. 1

ANCEL AD310 Classic Enhanced Universal OBD II Scanner Car Engine Fault Code Reader CAN Diagnostic Scan Tool, Read and Clear Error Codes for 1996 or Newer OBD2 Protocol Vehicle (Black)

CEL Doctor: The ANCEL AD310 is one of the best-selling OBD II scanners on the market and is recommended by Scotty Kilmer, a YouTuber and auto mechanic. It can easily determine the cause of the check engine light coming on. After repairing the vehicle's problems, it can quickly read and clear diagnostic trouble codes of emission system, read live data & hard memory data, view freeze frame, I/M monitor readiness and collect vehicle information.
Sturdy and Compact: Equipped with a 2.5 foot cable made of very thick, flexible insulation. It is important to have a sturdy scanner as it can easily fall to the ground when working in a car. The AD310 OBD2 scanner is a well-constructed mechanic tool with a sleek design. It weighs 12 ounces and measures 8.9 x 6.9 x 1.4 inches. Thanks to its compact design and light weight, transporting the device is not a problem. The buttons are clearly labelled and the screen is large and displays results clearly.
Accurate Fast and Easy to Use: The AD310 scanner can help you or your mechanic understand if your car is in good condition, provides exceptionally accurate and fast results, reads and clears engine trouble emission codes in seconds after you fixed the problem. This device will let you know immediately and fix the problem right away without any car knowledge. No need for batteries or a charger, get power directly from the OBDII Data Link Connector in your vehicle.
OBDII Protocols and Car Compatibility: Many cheap scan tools do not really support all OBD2 protocols. AD310 scanner as it can support all OBDII protocols such as KWP2000, J1850 VPW, ISO9141, J1850 PWM and CAN. This device also has extensive vehicle compatibility with 1996 US-based, 2000 EU-based and Asian cars, light trucks, SUVs, as well as newer OBD2 and CAN vehicles both domestic and foreign. Pls confirm with our customer service whether it is compatible with your vehicle before purchasing.
Home Necessity and Worthy to Own: This is an excellent code reader to travel or home with as it weighs less and it is compact in design. You can easily slide it in your backpack as you head to the garage, or put it on the dashboard, this will be a great fit for you. The AD310 is not only portable, but also accurate and fast in performance. Moreover, it covers various car brands and is suitable for people who just need a code reader to check their car.

Bestseller No. 2

MOTOPOWER MP69033 Car OBD2 Scanner Code Reader Engine Fault Scanner CAN Diagnostic Scan Tool for All OBD II Protocol Cars Since 1996, Yellow

Multi-Functions - Practical Multi-Functions OBD2 code reader features built-in OBD2 DTC lookup library, which help you to determine the cause of the engine light, read code, erase code, view freeze frame, I/M ready, vehicle information, data flow, real-time curve, get vehicle speed information, calculate load value, engine coolant temperature, get engine speed.
Wide Capability - Supports 9 protocols compatible with most 1996 US-Based, 2000 EU-Based and Asian cars, and newer OBD II & CAN domestic or import vehicles. Supports 6 languages - English,German, Dutch, Spanish, French, Italian.
2.8" LCD Display - Designed with a clear display 2.8" Large LCD screen - white backlight and contrast adjustment. No need any battery or charger, OBD reader gets the power directly from your vehicle through the OBDII Data Link Connector.
Compact Design - Car diagnostic scanner is equipped with a 2.5 feet long cable and made of a very thick flexible insulator.There are 6 buttons on OBD2 Scanner:scroll up/down,enter/exit and buttons that quick query VIN vehicle number& the DTC fault code.
ABS / Airbag codes NOT Supported - It is able to read and clear check engine information which is part of OBDII system, but it cannot work with non-OBDII systems, including ABS / Airbag / Oil Service Light, etc.

Bestseller No. 3

FOXWELL NT301 OBD2 Scanner Live Data Professional Mechanic OBDII Diagnostic Code Reader Tool for Check Engine Light

【Your Personal CEL Doctor – Read & Clear Engine Codes】The NT301 OBD2 scanner lets you read diagnostic trouble codes (DTCs), check em-issions readiness, turn off your Check Engine Light (CEL) or MIL, reset monitors, and view live data streams. It retrieves your vehicle's VIN instantly. Like all standard OBD2 scanners, it clears codes only after repairs are completed—if the issue persists, the code will return. Designed for DIYers who want to understand what’s really going on under the hood.
【Easy Code Reading – Just Plug & Play】Simply plug into the OBD2 port, turn the ignition to “ON” (engine off), and select the correct menu: Select OBDII-> Wait for seconds-> Select Read codes. For accurate results, ensure your vehicle is compatible and the OBD2 port is free from damage or wiring issues. No batteries needed— powered directly by your car.
【Live Data Graphing & Accuracy for Most OBD2 Vehicles】View and log live sensor data in graph form—monitor oxygen sensors, fuel trims, coolant temp, RPM, and more. Spot trends and suspicious values in real time. Compatible with most 1996+ gasoline cars, light trucks, and SUVs sold in the U.S., as well as many 2000+ European and Asian models. Also works on 12V diesel vehicles equipped with OBD2.
【S-mog Check Helper – Know Your Readiness Status at a Glance】With dedicated I/M readiness hotkeys and a simple Red-Yellow-Green LED indicator, you’ll instantly know if your vehicle is ready for em-issions testing. Built-in speaker provides audio feedback. No guesswork—just confidence before you head to the test center.
【A Must-Have Tool for Every Home Mechanic】Compact, rugged, and ready to use right out of the box. The 2.8” color screen is easy to read, even in daylight. No charging or setup required—just plug into the 16-pin DLC and start diagnosing. Recommended by professional mechanics on YouTube and trusted by DIYers worldwide.

Last update on 2026-03-23 / Affiliate links / Images from Amazon Product Advertising API

This product presentation was made with AAWP plugin.

Buffer Copy Email Facebook Flipboard Hacker News LinkedIn Messenger Mix Pinterest Print Reddit SMS Telegram Tumblr X VK WhatsApp Line Xing Threads