NHTSA ID Number: 11028574
Manufacturer Communication Number: No. 2311.5
TSB/Document Date: 2026-02-06
Summary
Instructions on advanced technical information for 992 2WD – DME Fault P310B00 – ‘Fuel Low Pressure – Implausible’
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
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TSB/Document ID: No. 2311.5
Replacement Service Bulletin Number:
MFR Communication Date: 2026-01-28
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE
MFR Component System:
MFR Component Subsystem:
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