2022-2026 Audi U140A00 Terminal 30 ECM Fault TSB

Symptoms

Owners of affected 2022-2026 Audi vehicles may notice the MIL (Malfunction Indicator Lamp) or exhaust emission lamp illuminating in the instrument cluster. This warning light indicates an issue with the engine control system.

Fault Codes / DTCs

When diagnosing the issue, technicians may find specific diagnostic trouble codes (DTCs) stored in the Engine Control Module (ECM), identified as -J623- (address word: 0001). The primary fault code associated with this issue is Audi U140A00 Terminal 30.

Diagnosis / Trigger Conditions

The root cause of the Audi U140A00 Terminal 30 fault is typically an interruption in the Terminal 30 voltage supply to the Engine Control Module (ECM, -J623-). It's important to note that the DTCs might not always be visible during a diagnostic session if they have been previously cleared. In such cases, or when the MIL is illuminated, the Guided Fault Finding (GFF) process must be executed.

Technicians are specifically instructed not to clear the DTC U140A00 and symptom codes 17262 without first completing the Guided Fault Finding process. If the DTC has been cleared from a previous diagnosis session and is no longer stored, the relevant test plan "J623 – Engine Control unit (MDG1) – check terminal 30" should be followed.

Repair Procedure Summary

The repair for the Audi U140A00 Terminal 30 issue involves a thorough diagnostic process using the Guided Fault Finding (GFF) system. This ensures that the underlying cause of the Terminal 30 open circuit is correctly identified and addressed.

1. Do not clear DTCs: It is crucial not to clear DTC U140A00 and symptom codes 17262 before beginning the diagnostic process.
2. Perform Guided Fault Finding: The primary step is to perform Guided Fault Finding. The test plan specifically connected to DTC U140A00 should be followed through the GFF system.
3. Address previously cleared DTCs: If the DTC is not currently stored in the ECM (e.g., it was cleared during a previous diagnostic session), technicians should work through the dedicated test plan titled "J623 – Engine Control unit (MDG1) – check terminal 30."

Required Tools or Parts

This Technical Service Bulletin does not specify particular replacement parts. The resolution primarily involves diagnostic and repair procedures. The following labor operations and codes are associated with this TSB for warranty claims:

• Service Number: 2470
• Damage Code: 0055
• Labor Operations:
  • GFF / Guided Functions (0150 0010) - See SRT with associated operations
  • GFF / Guided Functions (0150 0060) - Time stated on the diagnostic protocol

Owner Action

If your 2022-2026 Audi vehicle exhibits an illuminated MIL or exhaust emission lamp, and you suspect an Audi U140A00 Terminal 30 fault, it is recommended to schedule an appointment with an authorized Audi dealer. They have the necessary diagnostic tools and training to perform the Guided Fault Finding procedure and resolve the issue. Warranty coverage for this repair will depend on your vehicle's warranty status.