KNOWN FAULT · Volkswagen

Electrical system warning from the battery negative contactor, code P0AA500 (VW ID.4 and ID. Buzz)

Sources are not verified in real time and no entry confirms that your car is affected.

Engine / equipment: Volkswagen ID.4 and ID. Buzz electric
Period mentioned: 2021–2026 ID.4 and 2025–2027 ID. Buzz (US model years)
Symptoms: An “Electrical system” warning appears in the instrument cluster.
Possible cause described: The battery regulation control module (J840) stores code P0AA500: the high-voltage battery negative contactor circuit is stuck open. VW clears the code and tests the 12 V battery (replacing it if it fails); if the code cannot be cleared or the car comes back with the same fault, it replaces the J840 module repair kit (bulletin 93-26-03).
Check for the garage: Ask the workshop to read code P0AA500 at address 008C and follow bulletin 93-26-03, starting with the 12 V battery test.
Cost cited in the source: No verified estimate; ask the garage for a quote.A rough figure from the original database, not an up-to-date quote.

Sources from the original database

Anonymous answer, no personal data.

How much does it cost to repair this fault?

No verified estimate; ask the garage for a quote.

A rough figure from the original database, not an up-to-date quote.

How is it checked?

Ask the workshop to read code P0AA500 at address 008C and follow bulletin 93-26-03, starting with the 12 V battery test.

What are the symptoms?

An “Electrical system” warning appears in the instrument cluster.

Which cars and years does it affect?

Which fault codes appear?

Find garages near you and, before you say yes, check whether the quote is reasonable.

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