2021-2024 Audi U140A00 Terminal 30 ECM Fault

Symptoms

Owners of affected 2021-2024 Audi vehicles, including those experiencing the Audi e-tron U140A00 issue, may notice the following:

• The "MIL/ exhaust emission lamp lights up in the instrument cluster."
• Diagnostic Trouble Code (DTC) U140A00 and symptom code 17262 (Terminal 30 open circuit) are stored in the Engine Control Module (ECM), specifically J623 (address word: 0001).

Fault Codes / DTCs

This Technical Service Bulletin (TSB) 2073867/1 specifically addresses the following fault codes:

Code	Description	Module
U140A00	Terminal 30 open circuit	ECM, J623 (address word: 0001)
17262	Terminal 30 open circuit	ECM, J623 (address word: 0001)

Technical Background

The root cause of the DTC U140A00 and symptom code 17262 is often an interruption in the Terminal 30 voltage supply to the ECM, J623. This interruption can sometimes lead to the DTCs not being visible during a standard diagnosis session.

In such cases, it becomes necessary to perform the Guided Fault Finding process to correctly identify and address the issue. The DTC should not be cleared without completing the Guided Fault Finding procedure.

Important Warnings

Audi advises technicians and owners of the following critical information regarding this issue:

• "Do not clear the DTC U140A00 and symptom codes 17262 (Terminal 30 open circuit). The test plan connected to U140A00 should be perform through Guide Fault Finding."
• NOTICE: "In some cases, during the repair and maintenance work no DTC is stored in the ECM. This may occur if the DTC has already been clear from a previous diagnosis session. In this case, please work through the relevant test plan 'J623 - Engine Control unit (MDG1) – check terminal 30'."

Repair Procedure Summary

For the Audi e-tron U140A00 fault, the primary repair involves performing Guided Fault Finding. This diagnostic process is crucial for accurately identifying the cause of the Terminal 30 open circuit in the ECM.

Technicians should follow the steps outlined in the Guided Fault Finding system. It is critical not to clear the DTC U140A00 and symptom codes 17262 prematurely, as this can hinder proper diagnosis. If the DTC is not present during the repair, the specific test plan "J623 - Engine Control unit (MDG1) – check terminal 30" should be utilized.

Warranty Information

This repair, outlined in TSB 2073867/1, may be covered under warranty for eligible vehicles. The claim types include:

• Claim Type 110: For vehicles up to 48 months or 50,000 miles.
• Claim Type G10: For Certified Pre-Owned (CPO) vehicles, requiring owner verification.

If the vehicle is outside of warranty, this Technical Service Bulletin serves as informational guidance. The Service Number for this bulletin is 2470, and the Damage Code is 0055. Labor operations include "Charge Battery" (operation code 2706 8950) and "GFF / Guided Functions" (diagnostic time 0150 0000). All warranty claims must adhere to the Audi Warranty Policies and Procedures Manual.

Source: NHTSA ID 11002112