2018-2026 Audi V6 TFSI Drive System Malfunction TSB

Owners of certain 2018-2026 Audi models equipped with the V6 TFSI engine may encounter a "Drive system fault active in instrument cluster" message. This condition is often accompanied by specific diagnostic trouble codes (DTCs) related to the knock sensors. Audi Technical Service Bulletin (TSB) 2081342/1 provides guidance for technicians on how to address this infrequent issue.

This TSB clarifies that the underlying cause for this Audi V6 TFSI drive system malfunction is typically temporary and does not require parts replacement.

Symptoms

Owners will primarily notice the following symptom:

• A warning message stating: "Drive system fault active in instrument cluster"

This message indicates a detected issue within the vehicle's drive system, prompting the driver to seek service.

Fault Codes / DTCs

When diagnosing the "Drive system fault active in instrument cluster" message, technicians may find one or more of the following DTCs logged in the Engine Control Module -J623- (address word 0001):

Code	Description	Module
P032700	Knock Sensor 1 Circuit Low Input	Engine Control Module -J623-
P033200	Knock Sensor 2 Circuit Low Input	Engine Control Module -J623-
P032800	Knock Sensor 1 Circuit High Input	Engine Control Module -J623-
P033300	Knock Sensor 2 Circuit High Input	Engine Control Module -J623-

These codes point to an electrical anomaly within the knock sensor circuits.

Diagnosis / Trigger Conditions

The technical background provided in TSB 2081342/1 explains that the knock sensor housing can absorb an increased amount of moisture from its surroundings. This is particularly common after lengthy stationary periods, such as during vehicle transportation. The absorbed moisture alters the sensor's electrical properties, specifically its internal resistance, which can impair signal quality. The engine control unit then misinterprets this as a malfunction, leading to the logging of an event memory entry.

It is important to note that this complaint occurs very rarely and irregularly. The absorbed moisture typically dissipates on its own after the vehicle has been driven for an extended period, and the sensor is considered fully functional and compliant with requirements.

Important Warnings

Audi explicitly states a critical warning regarding this specific Audi V6 TFSI drive system malfunction:

• "Replacing parts will not fix the problem. Please erase the intermittent event memory entry and continue to observe the vehicle."

This means that replacing the knock sensors or related components will not resolve the underlying issue and is an unnecessary expense. Owners should be aware of this to avoid potentially costly and ineffective repairs.

Repair Procedure Summary

Given the nature of the issue, the recommended procedure for addressing the Audi V6 TFSI drive system malfunction outlined in TSB 2081342/1 is straightforward and does not involve replacing any parts. Technicians are advised to:

1. Reproduce the customer complaint to confirm the issue. This ensures the TSB applies to the specific vehicle and condition.
2. Verify that all vehicle-specific criteria (model, year, engine, etc.) are met before proceeding.
3. Erase the intermittent event memory entry from the Engine Control Module -J623-.
4. Continue to observe the vehicle. Since the moisture dissipates after driving, the fault is expected to clear and not return.

This approach prevents unnecessary part replacements and ensures that the vehicle's fully functional knock sensors are not mistakenly swapped out.

Warranty Information

For vehicles still under warranty, claims for this issue must adhere to the Audi Warranty Policies and Procedures Manual. The TSB specifies the following details for warranty claims:

• Claim Type: Informational only if the vehicle is outside of warranty.
• Service Number: 2872
• Damage Code: 0055
• Labor Operations:
  • GFF/ Guided Functions: 0150 0010 (See SRT with associated operations)
  • GFF/ Guided Functions: 0150 0060 (Time stated on the diagnostic protocol)
• Claim Comment: As per TSB 2081342/1

All submitted claims are subject to review and audit by Audi Warranty.

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NHTSA ID: 11031044 Source: manufacturer_communication