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Error code reference

Bosch Washer Error Code d:02

Motor control interruption

Bosch codesBosch washer codes

Motor control interruption — faulty motor control.

First step from the service manual

Run test P4; replace faulty motor control.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What d:02 means on a Bosch washer

The d:02 error code on a Bosch washer indicates a motor control interruption, meaning the machine has detected a fault within the motor control unit (MCU). The motor control unit is responsible for regulating the speed, torque, and direction of the drum motor. When communication between the main control board and the MCU is disrupted, or when the MCU itself fails internally, the washer cannot safely operate the motor and will halt the cycle to prevent further damage.

Common causes of this fault include a failed motor control board, loose or corroded wiring connections between the MCU and the drive motor, or a short circuit within the motor control circuitry itself. The MCU processes the power signals that drive the motor windings, so any interruption in that signal path, whether from a failed component, a wiring harness issue, or a damaged connector, can trigger this code. In some cases, power surges or overheating can degrade the MCU over time until it fails entirely.

The recommended first diagnostic step is to run test P4, which is a built-in diagnostic routine designed to evaluate motor control function. If P4 confirms the fault, the motor control unit will need to be replaced. Before replacing the MCU, technicians should inspect all associated wiring harnesses and connectors for signs of damage, burning, or poor contact, as a wiring issue can produce the same code and is less expensive to address.

Source: manufacturer service documentation.

Common causes of d:02

  1. 01

    Failed motor control unit (MCU)

    Part replacement

    The motor control board itself has failed internally, which is the most common cause of d:02. This is confirmed by running the built-in test P4, and replacement of the MCU is required if the test returns a fault.

  2. 02

    Loose or disconnected wiring harness

    Wiring / connection

    A wiring connector between the motor control unit and the drive motor may be loose, corroded, or partially disconnected. Inspect all connectors in the motor circuit for secure seating and signs of corrosion or heat damage.

  3. 03

    Damaged wiring to the MCU

    Part replacement

    Wires running to or from the motor control unit can be chafed, pinched, or burned, interrupting the control signal. A visual inspection of the full wiring harness in the motor circuit will help identify any visible damage.

  4. 04

    Power surge damage to the MCU

    Part replacement

    A voltage spike from the power supply can damage sensitive components on the motor control board. If the fault appeared suddenly after a power event, the MCU should be tested and likely replaced.

  5. 05

    MCU overheating due to restricted ventilation

    Wiring / connection

    If the washer has been operating in a poorly ventilated space or the MCU cooling path is obstructed, the board can degrade over time and eventually fail. Check that the unit has adequate clearance and airflow around it.

See the test procedure for each cause

Frequently asked questions about d:02

What does d:02 mean on a Bosch washer?
The d:02 code on a Bosch washer means there is a motor control interruption, pointing to a fault in the motor control unit (MCU). The MCU regulates the drum motor's speed and direction, and when it fails or loses communication, the washer stops the cycle and displays this code. Diagnosing it requires running the built-in test P4, followed by inspection or replacement of the motor control unit.
Can I fix the d:02 error myself?
Some basic checks, such as inspecting wiring connectors for looseness or corrosion, can be done by a knowledgeable DIYer. However, running the required P4 diagnostic test and replacing the motor control unit involves working with high-voltage components and disassembling the washer, which is best handled by a qualified technician. Attempting repairs without proper knowledge of appliance electrical systems can be dangerous.
Is it safe to use my Bosch washer when d:02 is showing?
No, you should not attempt to run the washer while the d:02 code is active. The washer has detected a fault in the motor control system and has stopped operation deliberately to prevent further damage to the motor or other components. Continue using the machine only after the fault has been properly diagnosed and repaired.
Will resetting my Bosch washer clear the d:02 error?
A reset may temporarily clear the displayed code, but it will not fix the underlying motor control fault. If the motor control unit has failed or there is a wiring issue, the d:02 code will return as soon as the washer attempts to run the motor. A proper repair, confirmed by running test P4, is needed to resolve the fault permanently.
How much does it cost to fix a d:02 error on a Bosch washer?
Repair costs vary depending on whether the issue is a wiring fault or a full motor control unit replacement. Wiring repairs tend to be less expensive, while a motor control unit replacement, including parts and labor, can range from around $150 to $400 or more depending on the specific model and local labor rates. Getting a diagnostic estimate from a certified technician before authorizing repairs is recommended.

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