2022-2024 Audi Q5 MIL On with DTC P044200

Owners of 2022-2024 Audi Q5 and Q5 Sportback models equipped with the 2.0t engine may encounter an illuminated Malfunction Indicator Lamp (MIL), commonly known as the Check Engine Light. This condition is often accompanied by the Diagnostic Trouble Code (DTC) P044200, indicating a small leak in the EVAP (Evaporative Emission Control System).

Audi Technical Service Bulletin (TSB) 01 24 10 2069166/3, released on February 23, 2024, provides guidance to technicians on how to proceed when diagnosing this specific issue. This bulletin supersedes an earlier version, Group 01 number 23-77, dated September 12, 2023, with revisions including updated instructions and an expanded model year coverage.

Symptoms

The primary symptom owners will notice is the illumination of the Malfunction Indicator Lamp (MIL) on the instrument cluster. This means the Audi Q5 MIL P044200 fault has been detected by the vehicle's engine control module.

Fault Codes / DTCs

When scanned, the Engine Control Module (ECM), specifically address word 0001 (-J623-), will likely store the following diagnostic trouble code:

• P044200: EVAP Emission Control System (Small Leak) Leak Detected (Passive/Active).

Diagnosis / Trigger Conditions

Audi's TSB 01 24 10 2069166/3 outlines a specific diagnostic approach for technicians. The process begins with verifying the MIL is on and the Audi Q5 MIL P044200 DTC is present. Technicians are instructed to perform EVAP system testing according to the ELSA Repair Manual, specifically navigating to "Engine>>Using the Evaporative Emissions tester >> 20 Fuel Supply >> Fuel System EVAP Leak Test >> EVAP System Leak Test, Vehicles with Fuel Tank Leak Detection Control Module (NVLD) >> EVAP system testing."

If no leaks are detected during this specialized testing, the technician should continue with the Guided Fault Finding (GFF) test plan. If, after completing the GFF test plan, the DTC P044200 remains static (active and persistent), the technician must contact the Audi Technical Assistance Center (TAC). If the DTC is passive or sporadic, no repairs should be performed, and the vehicle can be released.

Important Warnings

This TSB contains critical information for both technicians and owners:

• Do not replace parts prematurely: The bulletin explicitly states, "Various parts have been replaced under warranty for the condition noted above, but no issues were identified with these parts. In order to gather information on the DTC codes for the vehicles listed above, we are asking that you contact the Audi Technical Assistance Center (TAC) before replacing any parts. This will assist us in diagnosing any potential issues with the condition noted above."
• Warranty limitations: "This TSB is informational only and not applicable to any Audi Warranty." This means that while the TSB provides diagnostic guidance, it does not imply a free repair under Audi's warranty terms solely based on the bulletin.
• No production issue identified: Audi states, "No changes to production have been made, as no issue has been identified." This suggests the condition is not considered a widespread manufacturing defect requiring a production line change.

Repair Procedure Summary

The repair procedure for the Audi Q5 MIL P044200 fault, as guided by TSB 01 24 10 2069166/3, focuses on thorough diagnosis and data collection. Technicians must first confirm the MIL is illuminated and the P044200 DTC is stored. They will then perform a detailed EVAP system leak test using specialized equipment and follow the GFF test plan. If the DTC remains static after these steps, or if the vehicle is still under its New Vehicle Limited Warranty and the P044200 fault was previously set or remains static, the technician is required to contact the Audi Technical Assistance Center (TAC) before proceeding with any part replacements. All relevant DTCs and diagnostic logs, along with information about the EVAP testing tool used, must be attached to a TAC Web Ticket.

Owner Action

If your 2022-2024 Audi Q5 or Q5 Sportback displays a Check Engine Light (MIL) and you suspect the Audi Q5 MIL P044200 fault, it is recommended to schedule an appointment with an authorized Audi service center. Be aware that this Technical Service Bulletin is primarily for diagnostic guidance to technicians and does not automatically qualify for a warranty repair. Your dealer will follow the diagnostic steps outlined in TSB 01 24 10 2069166/3, which includes contacting Audi's Technical Assistance Center if necessary, before any parts are replaced.

Source: NHTSA ID 10250797