2022-2024 Audi U140A00 Terminal 30 ECM Fault TSB

Audi has released Technical Service Bulletin (TSB) 2073867/1 to address a specific diagnostic trouble code (DTC) that can affect various 2022-2024 Audi models. This bulletin focuses on the Audi U140A00 Terminal 30 fault, which relates to an interruption in the power supply to the Engine Control Module (ECM).

This issue can lead to the illumination of the Malfunction Indicator Lamp (MIL), also known as the exhaust emission lamp, on the instrument cluster. Owners experiencing this warning light should be aware of the underlying cause and the recommended repair procedure.

Symptoms

Owners may notice the following symptom if their vehicle is affected by this condition:

• The MIL/exhaust emission lamp lights up in the instrument cluster.

Technicians diagnosing the vehicle will find specific fault codes stored in the Engine Control Module (ECM), identified as J623.

Fault Codes / DTCs

When diagnosing this issue, technicians will typically find the following codes stored in the ECM (J623):

Code	Description	Module	Address Word
U140A00	Terminal 30 open circuit	ECM	0001
17262	Terminal 30 open circuit	ECM	0001

Technical Background and Diagnosis

The root cause of the Audi U140A00 Terminal 30 fault is an interruption in the Terminal 30 voltage supply to the Engine Control Module (ECM), specifically the J623 unit. This power supply issue can sometimes cause the Diagnostic Trouble Codes (DTCs) to become temporarily invisible during a diagnostic session.

To accurately diagnose and resolve this condition, it is crucial to perform the Guided Fault Finding process. This ensures that the underlying cause of the voltage supply interruption is correctly identified and addressed, rather than simply clearing the fault codes.

Important Warnings

Audi has issued specific instructions for technicians to ensure proper diagnosis and repair:

• "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."
• "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'."

These warnings highlight the importance of following the prescribed diagnostic steps to prevent misdiagnosis or temporary resolution of the problem.

Repair Procedure Summary

For customer complaints related to the Audi U140A00 Terminal 30 fault, the primary repair procedure involves performing Guided Fault Finding. This systematic diagnostic approach helps identify the precise location and nature of the Terminal 30 voltage supply interruption to the ECM.

If the DTC U140A00 and symptom code 17262 are present, the Guided Fault Finding process must be completed. It is critical not to clear these codes before completing the Guided Fault Finding, as this could hinder proper diagnosis. In situations where no DTC is currently stored in the ECM—possibly due to a previous clearing—technicians are instructed to work through the specific test plan titled "J623 - Engine Control unit (MDG1) – check terminal 30."

Warranty Information

This Technical Service Bulletin (TSB 2073867/1) outlines the warranty claim procedures for addressing the Audi U140A00 Terminal 30 fault. For vehicles within the warranty period, the claim type is 110, covering up to 48 months or 50,000 miles. For Audi Certified Pre-Owned (CPO) vehicles, claim type G10 applies, requiring owner verification.

If the vehicle is outside of its warranty coverage, this TSB serves as informational guidance only. The service number for this bulletin is 2470, and the damage code is 0055. Labor operations include "Charge Battery" (code 2706 8950) and "GFF / Guided Functions" (code 0150 0000), with diagnostic time based on the diagnostic protocol.

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Source: NHTSA ID: 11002212, TSB ID: 2073867/1