2023-2024 Audi Q5 Turbocharger Boost Control DTC P256300

Audi has released a manufacturer communication outlining diagnostic steps for specific issues affecting various models. This document highlights a common fault code, P256300, related to the turbocharger boost control position sensor circuit in certain Audi Q5 vehicles. It also addresses a separate concern regarding creaking noises in Audi A8 and S8 models.

Important Warnings and Process Changes

Audi emphasizes that owners and technicians should contact Audi Helpline before attempting repair for any issues detailed in this communication. Additionally, as of June 7, 2024, worksheets will no longer be a standard practice. Worksheets will only be required if explicitly listed in the topic details for a specific issue.

Audi Q5 (2023-2024) Turbocharger Boost Control Position Sensor Circuit Range/Performance (DTC P256300)

Owners of 2023 and 2024 Audi Q5 models equipped with the DSMA engine may experience a 'turbocharger boost control position sensor circuit range/performance' fault, triggering the Malfunction Indicator Lamp (MIL) and storing Diagnostic Trouble Code (DTC) P256300. This Audi Q5 turbocharger boost P256300 issue requires careful diagnosis.

Symptoms

The primary symptom for this issue is the illumination of the Malfunction Indicator Lamp (MIL) on the dashboard, accompanied by the stored DTC P256300.

Diagnosis / Trigger Conditions

Before performing any work on the vehicle, follow these steps:

1. Verify DTC P256300: Confirm that the DTC 'turbocharger boost control position sensor circuit range/performance' is indeed present.
2. Inspect Control Rod: Take photos of the turbocharger control rod.
3. Check for Looseness: Determine if the screw on the control rod is loose. If it is, investigate if there is any indication as to why it became loose.

After these initial diagnostic steps, it is crucial to contact Audi Helpline for further guidance before proceeding with any repairs.

Audi A8 / S8 (2022-2025) Creaking Noise from Front Instrument Panel Area

For 2022-2025 Audi A8 and S8 models, a separate issue involves a creaking noise originating from the front instrument panel area. This noise is often linked to loose front suspension strut tower brace bolts.

Symptoms

The main symptom is a noticeable creaking noise in the front instrument panel area of the vehicle.

Diagnosis / Trigger Conditions

If the vehicle presents with this issue, which is described in TSB 2066526, technicians should:

• Document the Issue: Take photos and video specifically showing which bolts are loose. Documentation should include both distant shots to show the location and close-up photos of the loose bolts.
• Mark Bolt Positions: Before removal, either mark each bolt to determine its original position or secure the bolts to the brace in their original locations using tape, wire, or similar methods.

Repair Procedure Summary

The recommended repair involves replacing the affected components:

1. Replace Components: Replace the front suspension strut tower brace and all associated bolts.
2. TAC Case Submission: Submit a Technical Assistance Center (TAC) case with a Worksheet titled "Creaking noise in front instrument panel area as in TSB 2066526".
3. Parts Retention: Retain all removed parts for return to the World Parts Return Center (WPRC).
4. Customer Concern Description: Provide a short description of the customer's concern and detail the conditions under which the noises are elicited.

This comprehensive approach ensures proper documentation and resolution for the creaking noise issue.

---

Source: NHTSA ID: 11012538