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

Important Warnings

This Technical Service Bulletin (TSB) includes critical safety information regarding high-voltage systems. High voltage significantly increases the risk of fatal injury, severe bodily injury, or death by electrocution or electric arcs. It is imperative that an Audi high-voltage technician or an Audi high-voltage expert de-energize the high-voltage system before any service is performed.

Furthermore, the TSB explicitly states: "Do not proceed according to GFF; instead, perform the following steps in the specified sequence." This means technicians should follow the TSB's repair procedure precisely, rather than relying on the Guided Functions and Fault Finding (GFF) system's initial recommendations, which might suggest immediate part replacement.

Symptoms

Owners of affected 2021-2022 Audi A7 TFSIe and Q5 TFSI vehicles may experience a primary symptom where the "Vehicle does not start." This condition is often accompanied by specific diagnostic trouble codes stored in the hybrid battery management control module (J840).

Fault Codes / DTCs

When the "Audi no start P0AA200" condition occurs, the following Diagnostic Trouble Codes (DTCs) may be 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

Diagnosis

The technical background for the "Audi no start P0AA200" issue indicates that the contact surfaces of the high-voltage (HV) contactors, located within the Battery Junction Box (BJB), can oxidize. This oxidation occurs in rare cases if the vehicle has not been used for a very long time or if it has been exposed to extremely high air humidity. This oxidation prevents proper electrical contact, leading to the no-start condition.

Repair Procedure Summary

Technical Service Bulletin 93 21 53 2063251/2 outlines a two-stage repair process for the "Audi no start P0AA200" problem:

1. Initial Attempt (Without Part Replacement):

   • Technicians first read all measured value blocks related to energy management from the gateway via GFF.
   • The ignition is then switched off and on again 5 to 10 times consecutively, with a 5-second wait each time.
   • All stored DTCs are erased.
   • A road test is performed in EV mode, with as many electrical consumers as possible switched on, to assess if the issue has resolved.
   • If the issue does not reoccur, the vehicle is returned to the customer, as this condition is rare and not expected to repeat.

2. Second Attempt (If Issue Persists):

   • If the "Audi no start P0AA200" condition or related DTCs reappear after the initial procedure, the High-Voltage Battery Control Module SX6 (Battery Junction Box, BJB) is replaced.
   • This replacement must follow instructions from the scan tool and the Elsa repair manual.
   • After replacement, the measured value blocks are read again, and the ignition cycling, DTC erasure, and road test procedures from the initial attempt are repeated to confirm the repair.

Required Parts

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

• Fasteners, Bolts, Nuts, and Screws: As needed per the repair manual (refer to ETKA/ELSA).
• High-voltage battery switch box BJB (Quantity: 1):
  • For Q5 models: Part Number 80A915235*
  • For A7 models: Part Number 4K0915254*

Warranty Information

This repair is covered under Audi's warranty for up to 48 months or 50,000 miles, whichever comes first. For Certified Pre-Owned (CPO) vehicles, coverage is under G10, requiring owner verification. If the vehicle is outside of any applicable warranty, this Technical Service Bulletin serves as informational guidance only.

Warranty claims for this procedure use Service Number 9327 and Damage Code 0010. Specific labor operations include 9327 0199 for the TSB Test Procedure (first attempt) and 9327 0299 if the procedure needs to be performed twice or if the HV battery control module needs replacement (9327 1950).

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Source: NHTSA ID: 10199218