2021 Audi MIL On: DTCs P023600 & P060600 in ECM

Audi has issued Technical Service Bulletin (TSB) 01 21 14 2063394/2 to address a specific condition affecting various 2021 Audi models equipped with the 2.0 TFSI engine. This bulletin outlines the diagnostic and repair procedure for situations where the Malfunction Indicator Lamp (MIL) illuminates, indicating a potential issue with the engine system.

This TSB, dated October 26, 2021, supersedes Technical Service Bulletin Group 01 number 21-05 dated May 19, 2021. It provides updated guidance for technicians to accurately diagnose and resolve the underlying cause of the illuminated MIL and associated fault codes.

Symptoms

Owners of affected 2021 Audi vehicles may notice the Malfunction Indicator Lamp (MIL) illuminating on their dashboard. This light, commonly known as the "Check Engine Light," indicates that the Engine Control Module (ECM) has detected a fault within the vehicle's engine or emissions system.

Fault Codes / DTCs

When the MIL is on, technicians performing a diagnostic scan will find specific Diagnostic Trouble Codes (DTCs) stored in the Engine Control Module (ECM), identified as J623 (address word 0001). The primary codes associated with this condition are:

Code	Description	Symptom Code
P023600	Charge air pressure sensor, Implausible signal	26363
P060600	Control module faulty	27740

Technical Background

Audi has identified that DTC P060600, indicating a "Control module faulty" condition with symptom code 27740, may be stored in the ECM without an actual fault. This occurs due to a diagnosis overlap, meaning the ECM incorrectly registers this fault in conjunction with other issues. The presence of this code does not necessarily mean the ECM itself is defective.

Repair Procedure Summary

The repair process for the Audi P023600 MIL on condition focuses on addressing the primary fault and then clearing any secondary, falsely stored codes. The steps are as follows:

1. Perform Guided Fault Finding for DTC P023600: Technicians must use the appropriate diagnostic tools to follow the Guided Fault Finding procedure specifically for DTC P023600. This process will guide them through diagnosing the "Charge air pressure sensor, Implausible signal" issue and implementing the necessary repairs.
2. Erase DTC P060600: Once the repairs related to DTC P023600 are completed and confirmed, technicians should then erase DTC P060600. Since P060600 is often a false positive due to diagnosis overlap, it should clear once the root cause of P023600 is resolved.

Important Warnings

Audi explicitly states a critical warning regarding the diagnosis of these DTCs:

• Do not replace the ECM. Claims for replaced ECM's will not be reimbursed.

This warning emphasizes that the P060600 code does not typically indicate a faulty Engine Control Module requiring replacement. Replacing the ECM will not resolve the underlying issue and will result in uncompensated repair costs.

TSB Revision History

This Technical Service Bulletin has undergone revisions to ensure accuracy and provide the most current information:

• Revision 2: Issued on October 26, 2021, this revision included a revised header that added model year information.
• Revision 1: The initial publication of this bulletin was on May 20, 2021.

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Source: NHTSA ID: 10202578