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Error code reference

Bosch Washer Error Code d:01

Motor control short circuited

Bosch codesBosch washer codes

Motor control short circuited — 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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  • Wiring diagram references and connector pinouts from the OEM service manual
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What d:01 means on a Bosch washer

The d:01 error code on a Bosch washer indicates a short circuit condition within the motor control unit (MCU). The motor control unit is the electronic module responsible for regulating power delivery to the drive motor, managing motor speed, torque, and direction throughout the wash and spin cycles. When the MCU's internal circuitry develops a short, the control system detects an abnormal electrical condition and halts operation to prevent further damage to the machine or a potential fire hazard.

A short circuit within the motor control unit can result from several underlying issues. Sustained voltage spikes or power surges can overwhelm the MCU's internal components, causing transistors or MOSFETs within the inverter circuit to fail in a shorted state. Moisture intrusion into the control module, excessive heat buildup, or simple component fatigue over time can also cause internal short circuits. In some cases, a winding short in the drive motor itself can reflect back into the control circuitry and trigger this fault.

Diagnosing this code begins with running the washer's built-in diagnostic routine, specifically test P4, which exercises the motor control system and confirms whether the fault is consistent and active. If test P4 confirms the short circuit condition, the motor control unit must be replaced. Before replacing the MCU, technicians should also inspect the motor windings and wiring harness for damage that could have caused or contributed to the control board failure.

Source: manufacturer service documentation.

Common causes of d:01

  1. 01

    Failed motor control unit (MCU)

    Part replacement

    Internal short circuits within the MCU itself are the most direct cause of d:01. Failed transistors, MOSFETs, or other power components inside the module trigger this fault and require replacement of the unit.

  2. 02

    Power surge or voltage spike damage

    Part replacement

    A sudden surge in household voltage can destroy internal components of the motor control board, leaving them shorted. Inspect for signs of burn marks or discoloration on the board.

  3. 03

    Shorted drive motor windings

    Part replacement

    A short circuit in the drive motor's windings can send abnormal current back through the control circuitry, damaging the MCU and triggering this error. Testing motor winding resistance can help identify this condition.

  4. 04

    Moisture or corrosion on the MCU

    Part replacement

    Water intrusion into the motor control module can cause conductive bridges between circuits, creating a short. Look for corrosion, water staining, or mineral deposits on the board's connectors and surface.

  5. 05

    Damaged wiring harness between MCU and motor

    Wiring / connection

    Chafed, pinched, or broken wires in the harness connecting the motor control unit to the drive motor can create a short circuit condition that registers as a d:01 fault. Inspect the full length of the harness for visible damage.

See the test procedure for each cause

Frequently asked questions about d:01

What does d:01 mean on a Bosch washer?
The d:01 code on a Bosch washer means the motor control unit has been detected as short circuited. This is a fault in the electronic module that powers and regulates the drive motor. The washer will stop operating when this code appears to prevent further electrical damage. Resolving it typically requires running diagnostic test P4 and replacing the motor control unit.
Can I fix the d:01 error on my Bosch washer myself?
Diagnosing and repairing the d:01 error requires running the built-in diagnostic test P4 to confirm the fault, then replacing the motor control unit if the short circuit is confirmed. This involves working with high-voltage components inside the machine, which presents serious safety risks for those without electrical repair experience. Most homeowners should have this repair performed by a qualified appliance technician. If you are comfortable with appliance disassembly and electrical safety precautions, replacing the MCU is a definable repair task.
Is it safe to use my Bosch washer when d:01 is displayed?
No, you should not continue using your Bosch washer while the d:01 code is active. A short circuit in the motor control unit is an electrical fault that can generate excess heat, damage other components, or in rare cases pose a fire risk. The washer's control system stops the machine specifically to prevent these outcomes, and operating it in this condition could worsen the damage and increase repair costs.
Will resetting my Bosch washer clear the d:01 error code?
A simple power reset will not permanently clear the d:01 error code because the underlying short circuit in the motor control unit remains present. The fault will return as soon as the machine attempts to operate the motor again. The code can only be resolved by repairing or replacing the faulty motor control unit after confirming the fault with diagnostic test P4.
How much does it cost to repair a Bosch washer with a d:01 error?
Repair costs for a d:01 error depend primarily on the price of the replacement motor control unit and labor rates in your area. Parts alone for a Bosch MCU typically range from around 150 to 350 dollars depending on the specific model. With professional labor, total repair costs commonly fall in the range of 250 to 550 dollars. Getting a quote before proceeding is advisable, as this helps you weigh repair cost against the age and overall condition of the machine.

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