2023-2026 Audi ABS/ESC Implausible Speed Sensor Signal TSB

Owners of certain 2023-2026 Audi models may experience various warning lights and system malfunctions related to an Audi ABS ESC implausible signal. This technical service bulletin, TSB 2072304/3, addresses situations where the Anti-lock Braking System (ABS) and Electronic Stability Control (ESC) speed sensors provide unreliable data, leading to erroneous warnings in the instrument cluster.

Symptoms

Owners may notice one or more of the following symptoms related to an Audi ABS ESC implausible signal:

• ESC indicator display activates.
• Tire pressure information display activates without cause.
• ABS malfunction display activates.
• Tire pressure loss warning display activates without cause.
• Issues with chassis, wheels, tires, and tire pressure monitoring functionality.
• Cruise control system (ADR, ACC) malfunction display activates.
• Anti-slip regulation (ASR) indicator display does not activate.
• Tire pressure monitoring system malfunction display activates.
• Tire pressure loss information display activates without cause.
• Emergency braking function warning indicator activates.
• A TPMS warning appears in the instrument cluster even when there is no actual pressure loss.
• An ABS/ESC warning message appears in the instrument cluster.

Fault Codes / DTCs

When an implausible signal from a rotational speed sender occurs, a Diagnostic Trouble Code (DTC) referring to this condition will be stored in the ABS control unit J104 (address word 0003). It is possible for multiple rotational speed senders to register such a fault.

Diagnosis / Trigger Conditions

The root cause of the implausible signal from the ABS speed sensor is typically external interference. Dirt, foreign objects, or grease accumulating in the area of an ABS speed sensor or on the sensor ring of the wheel bearing can distort the sensor's signals. This distortion causes the control unit to recognize the signal as implausible, triggering the various warning indicators and system malfunctions.

Repair Procedure Summary

To address the Audi ABS ESC implausible signal, technicians should perform the following steps:

1. Inspect thoroughly: Carefully check all ABS speed sensors and the sensor rings located on the wheel bearing for any signs of foreign objects, grease, or dirt.
2. Clean components: Clean all dirty components meticulously to remove any contaminants that could be interfering with the sensor signals.
3. Clear DTCs: After cleaning, erase any stored DTCs from the vehicle's system.
4. Guided Fault Finding: If, after inspection and cleaning, no irregularities are detected, technicians should proceed with Guided Fault Finding to further diagnose and resolve any remaining DTCs.

Owner Action

If your 2023-2026 Audi exhibits any of the symptoms described, especially persistent ABS/ESC or TPMS warnings without an actual tire pressure issue, it is recommended to have your vehicle inspected by an authorized Audi service center. The TSB indicates that this bulletin is for informational purposes and is not applicable to any Audi warranty, meaning repairs may not be covered depending on your vehicle's warranty status.

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Source: NHTSA ID: 11025336, TSB ID: 2072304/3