Several warnings at once in the instrument cluster when switching on or pre-conditioning while plugged in: rear motor electronics (EQA and EQB 4MATIC, P061AE9)

Engine / equipment

Mercedes EQA and EQB with a rear motor (4MATIC)

Period mentioned

2022–2023

Symptoms

Several fault messages appear in the instrument cluster, especially if pre-conditioning starts or the ignition is switched on with the charging cable plugged in; power may be reduced. The rear-axle power electronics (N129/2) store P061AE9 and sometimes others such as U009BFF, P0A31FF or P0A1C9A.

Possible cause described

Mercedes-Benz bulletin LI08.20-P-077050 (October 2023) explains that the rear-axle power electronics detect an undervoltage with the car unlocked and store P061AE9. It is fixed with a software update of that unit.

Check for the garage

Check whether the car has a rear motor (4MATIC) and whether P061AE9 is in unit N129/2. Before replacing the motor or its electronics, ask Mercedes for the software update; if the code comes back afterwards, the garage opens a technical case with the brand.

Cost cited in the source

No parts cost: it is a software update; ask whether the warranty covers it.A rough figure from the original database, not an up-to-date quote.

Sources from the original database