2021-2025 Audi Fuel System DTCs P014800 and P008700

Owners of various 2018-2025 Audi models, including the Q5, SQ5, A4, A5, A6, A7, Q7, Q8, and their performance variants, may experience issues related to the fuel system. These problems are often indicated by a Malfunction Indicator Lamp (MIL) illumination or the vehicle entering a reduced power "limp-home" mode.

This condition is addressed by Audi Technical Service Bulletin (TSB) 2079461/3, which provides detailed diagnostic and repair instructions for technicians. The TSB specifically focuses on situations where the Engine Control Unit (ECM) logs Diagnostic Trouble Codes (DTCs) P014800 or P008700. Understanding the symptoms and the recommended repair process is crucial for resolving this Audi fuel system DTC P014800 issue effectively.

Symptoms

If your Audi is affected by this condition, you may observe the following:

• The "MIL light is on" in the instrument cluster.
• The vehicle's "limp-home function activates", restricting engine power to prevent further damage.

These symptoms suggest a problem with the fuel delivery system, prompting the ECM to store specific fault codes.

Fault Codes / DTCs

Technicians will find one or both of the following Diagnostic Trouble Codes (DTCs) stored in the Engine Control Unit -J623- (address word 0001):

Code	Description	Module
P014800	Fuel Delivery Error	Engine Control Unit
P008700	Fuel Rail/System Pressure - Too Low	Engine Control Unit

Diagnosis and Trigger Conditions

Diagnosis for the Audi fuel system DTC P014800 begins with clearing the DTCs P014800 and P008700 from the Engine Control Unit. If these DTCs reappear, further diagnostic steps are necessary. If the fault does not reset and the vehicle is in for the first time, no further diagnosis is required before proceeding with specific tests.

Technicians are instructed to perform tests related to the low-pressure pump, as detailed in the ELSA repair manual. These include "Checking fuel delivery rate" and a "Pressure test in the fuel supply line."

For concerns that are reproducible or static, a specific procedure must be followed. This involves installing a VAS 6550 pressure gauge on the low-pressure side, just before the high-pressure fuel pump. This setup allows for continuous monitoring of the in-line fuel pressure on the low-pressure side while the engine is running.

Using the ODIS-S self-diagnosis function, a graph of measured high-pressure values (Actual VS. Specified) should be set up to monitor the in-line fuel pressure on the high-pressure side. If, during engine operation, the low-side pressure does not drop below 3 bar AND the high-side pressure does not exceed 20 bar, the high-pressure fuel pump should be replaced.

For repeat repairs where the concern is not reproducible, technicians should check the expanded ambient conditions for DTCs P014800 and P008700. If the fuel rail pressure on the high-pressure side is approximately 10 bar, the high-pressure fuel pump should be replaced before considering other parts of the fuel system. An example provided in the TSB shows an actual fuel pressure of 880 kPa (8.8 bar) against a specified value of 243.5 bar, indicating the need for high-pressure fuel pump replacement.

Repair Procedure Summary

The primary repair involves the diagnosis and potential replacement of the high-pressure fuel pump. After confirming the presence of DTCs P014800 or P008700, technicians will clear the codes and re-evaluate.

If the codes return, the low-pressure fuel pump system is tested, including checks for fuel delivery rate and pressure in the supply line. For persistent issues, specialized tools are used to monitor fuel pressure in real-time. If the low-side pressure remains above 3 bar and the high-side pressure stays below 20 bar, or if the fuel rail pressure is around 10 bar in repeat cases, the high-pressure fuel pump is deemed faulty and replaced.

Required Tools and Diagnostic Software

To perform the diagnostic and repair procedures outlined in TSB 2079461/3, technicians will utilize specific equipment:

• VAS 6550 pressure gauge: Used for monitoring in-line fuel pressure on both the low and high-pressure sides of the fuel system.
• ODIS-S diagnostic software: Essential for accessing self-diagnosis functions, setting up graphs of measured values, and monitoring high-pressure fuel readings.
• ELSA repair manual: Provides detailed instructions for testing the low-pressure pump and other repair procedures.
• High-pressure fuel pump: The primary component that may require replacement.

Warranty Information

This Technical Service Bulletin provides guidance for repairs under warranty. The specific details for claiming warranty work are as follows:

• Claim Type: If the vehicle is outside of any warranty, this Technical Service Bulletin is informational only, meaning charges may apply.
• Service Number: 2463
• Damage Code: 0010

Specific labor operations and their associated codes for technicians include:

Labor Operation	Code	Time Units (TU) / Reference
Remove and install high-pressure pump	2463 19XX	See SRT with associated operations
Remove and install 2 high-pressure pumps	2463 20XX	See SRT with associated operations
Check fuel pump	2066 0199	50 TU
Remove and install cover	1083 1900	See SRT with associated operations
Remove and install air filter housing (gasoline engines)	2425 19XX	See SRT with associated operations
GFF/ Guided Functions	0150 0060	Time stated on the diagnostic protocol

All warranty claims must adhere to the Audi Warranty Policies and Procedures Manual and are subject to review or audit by Audi Warranty.

Important Owner Information

Owners should be aware that if their vehicle is no longer under warranty, this Technical Service Bulletin serves as informational guidance only. Any repairs performed may incur charges. It is always recommended to consult with an authorized Audi dealership to understand specific warranty coverage and potential costs.

Revision History

This Technical Service Bulletin has undergone several revisions to ensure accuracy and updated information:

• Revision 3 (December 11, 2025): Revised the header to add the Q5 model, updated the model table in the Condition section, and revised the Warranty section to update the Service Number.
• Revision 2 (November 19, 2025): Revised the Condition section to add models to the table and updated the Warranty section to revise the Service Number.
• Revision 1 (October 14, 2025): Initial publication of the bulletin.

NHTSA ID: 2079461/3