2021-2022 Audi Q5 e / A7 e No Start DTC P0AA200 P0AA500

Audi has issued Technical Service Bulletin (TSB) 93 24 84 2063251/3 to address a no-start condition that may occur in certain 2020-2022 Audi Q5 e quattro and 2021-2022 Audi A7 e quattro vehicles. This bulletin, which supersedes TSB 21-53 dated July 12, 2021, provides updated guidance for diagnosing and resolving the issue.

This condition is often accompanied by specific diagnostic trouble codes (DTCs) stored in the hybrid battery management control module, J840. Owners experiencing an Audi Q5 e no start P0AA200 or P0AA500 should be aware of this TSB.

Symptoms of a No-Start Condition

The primary symptom reported by owners is that the vehicle simply "Vehicle does not start". This indicates a critical failure within the high-voltage system that prevents the vehicle from operating.

Associated Fault Codes (DTCs)

When diagnosing the no-start condition, technicians will typically find one or both of the following DTCs stored in the hybrid battery management control module, J840 (address word 008C):

Code	Description	Symptom Code
P0AA200	Hybrid/EV Battery Positive Contactor Circuit Stuck Open	20481
P0AA500	Hybrid/EV Battery Negative Contact Circuit Stuck Open	20483

These DTCs indicate a problem with the high-voltage contactors, which are critical components for connecting and disconnecting the high-voltage battery from the vehicle's electrical system. The TSB includes figures illustrating the DTC memory entries for both P0AA200 and P0AA500, showing their respective error types (passive/sporadic or active/static) and status information.

Technical Background

The root cause of these DTCs and the no-start condition is often the oxidation of the contact surfaces within the high-voltage (HV) contactors. These contactors are located inside the battery junction box (BJB). Oxidation can occur if the vehicle is not used for a prolonged period or if it operates in environments with extremely high air humidity.

Important Safety Warnings

DANGER

High voltage increases the risk of fatal injury. Severe bodily injury or death by electrocution or electric arcs is possible.

• Have an Audi high-voltage technician or an Audi high-voltage expert de-energize the high-voltage system.

WARNING

High voltage increases the risk of fatal injury. Severe bodily injury or death by electrocution or electric arcs is possible.

• Have an Audi high-voltage technician or an Audi high-voltage expert bring the vehicle high-voltage system back into service.

Due to the extreme hazards associated with high-voltage systems, only qualified Audi high-voltage technicians or experts should perform any diagnostic or repair work related to this issue. Attempting to work on these systems without proper training and equipment can lead to severe injury or death.

Repair Procedure Summary

For the Audi Q5 e no start P0AA200 or P0AA500 condition, the TSB 93 24 84 2063251/3 outlines a specific repair process. It explicitly states: "Do not proceed according to GFF; instead, perform the following steps in the specified sequence."

Initially, technicians are instructed to:

1. Read out all measured value blocks related to energy management from the gateway using GFF and save them.
2. Cycle the ignition off and on 5 to 10 times, waiting 5 seconds each time.
3. Erase all stored DTCs.
4. Perform a road test in EV mode with as many electrical consumers as possible activated.
5. Re-assess if the issue persists.

If the issue does not reoccur, the vehicle can be returned to the customer. However, if the no-start condition or associated DTCs reappear, the following steps are required:

1. Replace the High-Voltage Battery Control Module SX6 (BJB) according to scan tool instructions and the Elsa repair manual.
2. Read out all measured value blocks relating to energy management from the gateway via GFF and make them available online.
3. Cycle the ignition off and on 5 to 10 times, waiting 5 seconds each time.
4. Erase all DTCs.
5. Perform a road test in EV mode with as many electrical consumers as possible activated.
6. Re-assess if the issue still occurs.

Required Parts and Tools

Parts are only to be replaced if the initial TSB Test Procedure does not resolve the concern. The following parts may be required:

• For Q5 models: High-voltage battery switch box BJB, part number 80A915235 (order by VIN if needed).
• For A7 models: High-voltage battery switch box BJB, part number 4K0915254 (order by VIN if needed).

Additionally, fasteners, bolts, nuts, and screws as needed per the Repair Manual will be required. Always consult with your Parts Department and/or ETKA for the latest information and parts bulletins.

Warranty Information

For vehicles outside of warranty, this Technical Service Bulletin is informational only. For eligible vehicles, warranty claims should be submitted in accordance with the Audi Warranty Policies and Procedures Manual. Claims are subject to review or audit by Audi Warranty.

Relevant labor operations for this TSB include:

• TSB Test Procedure, performed once (Issue resolved 1st attempt): Labor operation 9327 0199 (10 TU)
• TSB Test Procedure, performed twice (Issue not resolved on the 1st attempt; repair required): Labor operation 9327 0299 (10 TU)
• HV battery control module remove + reinstall (only to be claimed if the TSB Test Procedure did not repair the concern on the 1st attempt): Labor operation 9327 1950 (See SRT with associated operations)

NHTSA ID: 11005964