2021 Audi Cooling Oil Valve DTC P1A5B00 TSB

Symptoms

Owners of affected 2021 Audi models may experience a diagnostic trouble code (DTC) entry in the vehicle's system, specifically after a repair involving the Transmission Control Unit (TCM) or Valve Body. The primary symptom is that the "Calibration of cooling oil valve" basic setting cannot be performed successfully after a repair. This leads to the storage of DTC P1A5B00 in the Transmission Control Module (TCM), J217.

Fault Codes / DTCs

When this condition occurs, the following diagnostic trouble code will be stored in the Transmission Control Module (TCM), J217 (address word 0002):

Code	Description	Symptom Code
P1A5B00	Cooling oil valve, no basic setting	20832

Diagnosis / Trigger Conditions

This issue typically arises after a repair has been performed on the transmission. The routine for calibrating the cooling oil valve is initiated but then aborted because the measured value is outside the acceptable tolerance range. Technicians will find the P1A5B00 fault code logged in the event memory of the TCM, J217, indicating that the basic setting for the cooling oil valve could not be completed.

Important Warnings

During the basic settings procedure, it is important to note that a cooling fan may be required to maintain the transmission's temperature within acceptable limits. This helps prevent overheating during the calibration process.

Repair Procedure Summary

Audi Technical Service Bulletin 34 23 65 2070167/2 outlines two potential repair options, depending on the vehicle's current software and hardware configuration.

Repair Option 1: Software Update

If the installed software part number and software version number of the Transmission Control Module (TCM), J217, match those listed in the SVM table within the TSB, a software update is the recommended solution. The technician will update the TCM using the SVM action code 02A222. This update provides a default value, eliminating the need for further calibration and allowing the vehicle to be operated immediately.

For example, for A4 models with installed software part number 8W2927155BP version 0002 or 4K0927153M version 0003, the new software part number will be 8W2927155BP version 0003 or 4K0927153M version 0007, respectively. For A6/A7 models with installed software part number 4K0927153M version 0005, the new software part number will be 4K0927153M version 0007.

Repair Option 2: Mechatronic Unit Replacement

If the vehicle's installed software part number and software version are not found in the SVM table, the complete mechatronic unit must be replaced. This replacement should follow the instructions in the repair manual. After installing the new mechatronic unit, the following steps must be performed using a scan tool:

• Activate the new control unit using the Guided Function "0002 - Replace mechatronic unit (control unit)".
• Perform specific basic settings via ODIS, including: Calibration of position sensors -G487...G490-, Adaption of clutch kiss points, and Calibration of gear sensor (applicable only for 2016 and 2017 A6 2.0 Front Wheel Drive models).

Required Tools or Parts

For Repair Option 2, the following parts may be required:

• Mechatronics unit: Part number to be determined via ETKA (Order to VIN).
• Fasteners: Bolts, nuts, and screws as needed per the repair manual.

Warranty Information

This repair is covered under warranty for up to 48 months or 50,000 miles. For Certified Pre-Owned (CPO) vehicles, coverage is designated as G10, requiring verification of owner eligibility. If the vehicle is outside of warranty, this Technical Service Bulletin 34 23 65 2070167/2 serves as informational guidance only. The service number for warranty claims is 3511, with a damage code of 0016.

Owner Action

If your 2021 Audi A7, A4, A5, A6, or Q5 is exhibiting the "Cooling oil valve, no basic setting" fault or DTC P1A5B00 after a transmission-related repair, you should contact your authorized Audi dealership. Inform them about the symptoms and the diagnostic trouble code. Reference Technical Service Bulletin 34 23 65 2070167/2 to ensure they are aware of the recommended repair procedures.

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Source: NHTSA ID 10245620