2024-2025 Audi Q5 e Engine Warning Lamp TSB 2080142/1

Symptoms

Owners of 2024-2025 Audi Q5 e quattro (PHEV) vehicles may observe the engine warning lamp (MIL) illuminating in the instrument cluster. This warning indicates a potential issue within the vehicle's system, and in this specific case, it is linked to the refrigerant pressure sensor.

Fault Codes / DTCs

When the Audi Q5 e engine warning lamp illuminates due to this condition, one or more of the following diagnostic trouble codes (DTCs) may be stored in the Thermal Management control unit, J1024 (address word 00C5):

• P2CD400: This code indicates a deviation between refrigerant pressure sensor 1 and 2, suggesting an inconsistency in their readings.
• P053100: This code signifies an implausible signal from the A/C Pressure/Temperature Sensor, meaning the sensor's output is outside expected parameters.
• P0251600: Similar to P053100, this code points to an implausible signal specifically from A/C Pressure/Temperature Sensor 2.

These codes collectively suggest a problem with the refrigerant pressure sensing system, which Audi has identified as primarily a software-related issue.

Diagnosis / Trigger Conditions

Audi Technical Service Bulletin (TSB) 2080142/1 identifies the root cause of the Audi Q5 e engine warning lamp illumination and associated DTCs as a software issue within the refrigerant pressure sensor system. This software anomaly leads to incorrect readings or interpretations, causing the vehicle's onboard diagnostics to register an implausible signal or deviation, thereby triggering the MIL.

Important Warnings for Owners

Audi has issued specific instructions to dealerships regarding this condition. It is crucial for owners to understand these points:

• Do not replace components prematurely: The bulletin explicitly states, "Do not replace any components for this condition since this will not resolve the customer's concern." Replacing the refrigerant pressure sensor or other related parts will not fix the underlying software problem and may result in unnecessary costs or delays.
• Solution under development: A permanent software solution for this issue is currently under development. Audi anticipates that a fix will be available around week 13 of 2026, though this timeline is subject to change.

Repair Procedure Summary

For 2024-2025 Audi Q5 e vehicles experiencing the Audi Q5 e engine warning lamp and related DTCs, technicians are instructed to follow a specific protocol outlined in TSB 2080142/1:

1. Initial Diagnosis: The vehicle should be diagnosed according to standard procedures. If the condition matches the software issue described in the bulletin, technicians are to inform the customer that a solution is pending and no immediate repairs are necessary.
2. PSS Record Creation: Dealers must create a Pending Service Solutions (PSS) record in the Audi Now system. This helps Audi track the prevalence of the issue and manage the development of the final solution.
3. Event Memory Management: Technicians should erase any stored event memory entries in diagnostic address 00C5. After clearing the codes, they will reassess the complaint.
4. Sensor Pressure Check (If Codes Reappear): If the DTCs are logged again after clearing, a sensor pressure check must be performed using Guided Fault Finding. This step is to determine if the refrigerant pressure sensor is physically defective.
5. Sensor Replacement (If Defective): Only if the sensor pressure check identifies the refrigerant pressure sensor as genuinely defective should it be replaced.
6. Waiting for Software Fix: If the refrigerant pressure sensor is found not to be defective and the event memory entries are not logged again, owners will need to wait for the official software measure to become available.

What Owners Should Do

If your 2024-2025 Audi Q5 e quattro (PHEV) displays the engine warning lamp (MIL) and you suspect it's related to the refrigerant pressure sensor, it is recommended to visit an authorized Audi dealership. Inform them about the symptoms and mention Audi Technical Service Bulletin 2080142/1. The dealership will perform the necessary diagnostic steps and create a PSS record. Be aware that a permanent software fix is not yet available, and immediate component replacement is generally not recommended for this specific issue unless a physical defect is confirmed.

Source: NHTSA ID: 11026289