2023 Audi e-tron 'Safe CP' Message TSB 2074876/1

Understanding the 'Safe CP' Message

Owners of certain 2023 and 2024 Audi e-tron and Q8 e-tron models may encounter a "Safe CP" message displayed in the instrument cluster. This message is typically accompanied by other various warnings and indicates a potential issue with component protection or related systems. This condition is addressed by Audi Technical Service Bulletin (TSB) 2074876/1.

Symptoms

The primary symptom of this issue is the appearance of the message "Safe CP" in the instrument cluster. This warning is often displayed alongside other messages, indicating a system malfunction. The presence of this message suggests that component protection may be active or that there are underlying data set or sensor setting issues.

Fault Codes / DTCs

Technicians investigating the "Safe CP" message will likely find one or more of the following Diagnostic Trouble Codes (DTCs) stored in various control units:

• U110100: "Component protection active"
  • This DTC may be stored in the Brake Electronics Control Unit (-J104-, diagnostic address 0003), Electronic Central Electrical (BCM) (-J519-, diagnostic address 0009), Airbag Control Unit (-J234-, diagnostic address 0015), Instrument Cluster (-J285-, diagnostic address 0017), or Control Unit for Night Vision System (-J853-, diagnostic address 0084).
• C115E54: "Inertial sensors no basic setting"
  • This DTC may be stored in the Airbag Control Unit (-J234-, diagnostic address 0015) as a subsequent fault.
• U111800: "Data set missing"
  • This DTC may be stored in the Chassis Control with Air Suspension (-J775-, diagnostic address 0074).

Technical Background

The root cause of the "Safe CP" message and associated DTCs, including U110100, is identified as a software issue within the Comfort System Control Module (J393, diagnostic address 0046). This software anomaly can lead to incorrect component protection activation or related sensor and data errors.

Important Warnings for Owners and Technicians

• Exclusion for Specific DTCs: This TSB 2074876/1 does NOT apply if the DTC "U110100: component protection active" is logged specifically in the Gateway (diagnostic address 0019) and/or in the Comfort System Control Module (diagnostic address 0046). In these cases, a different diagnostic approach may be required.
• Key Position During Update: During the software update procedure, the key MUST remain on the emergency reader coil. Failure to do so could interrupt the update process.

Repair Procedure Summary

The repair for the Audi e-tron Safe CP message primarily involves updating the software of the Comfort System Control Module (J393). This TSB replaces a previous bulletin, PSS TSB 2072587.

1. Software Version Management (SVM): Follow the instructions detailed in TSB 2011732 for 00 Software Version Management (SVM) operating procedures.
2. Module Update: Update the J393 (diagnostic address 0046) using the SVM action code 46A034. The new software version 0630 will replace the old version 0627 for part number 8W1.907.064.*.
3. Bus Sleep Cycle: After the software update, cycle the ignition key off and allow the vehicle to sit for a few minutes. This ensures the module resets and enters a bus sleep cycle.
4. Inertial Sensor Basic Settings: In some cases, the DTC C115E54: "Inertial sensors no basic setting" may still be present in the Airbag Control Unit (-J234-, diagnostic address 0015) after the update. If this occurs, perform the basic settings for the inertial sensors to clear this fault. It is not necessary to perform test plans for faults in the Chassis Control with Air Suspension (-J774-, diagnostic address 0074).
5. Clear Faults: Once all procedures are complete, delete any remaining fault codes from the vehicle's memory.

Warranty Information

This Technical Service Bulletin (TSB) 2074876/1 provides guidance for repairs. If the vehicle is outside of its warranty period, this bulletin serves as informational guidance only, and the repair may not be covered. The Service Number for this procedure is 5789, with a Damage Code of 0039. Labor operations include Software Update (0151 0010, 0151 0060) and Vehicle Check (0689 0199) for data bus sleep mode.

NHTSA ID: 11007319