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Error code reference

Bosch Washer Error Code dr: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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What dr:01 means on a Bosch washer

The dr:01 error code on a Bosch washer indicates a short circuit condition within the motor control unit (MCU). The motor control unit is the dedicated electronic board responsible for regulating power delivery to the drive motor, controlling spin speed, direction, and torque throughout each wash cycle. When the MCU develops an internal short circuit, it loses the ability to properly manage motor operation, which triggers this fault code and typically halts the machine to prevent further electrical damage.

A short circuit within the motor control can originate from several sources: failed power transistors or MOSFETs on the control board, damaged capacitors, burned traces on the PCB, or moisture and detergent contamination that creates unintended current paths across the board's circuits. Mechanical overloads, such as a seized motor bearing or a drum obstruction that causes the motor to draw excessive current, can also stress the MCU to the point of failure. Voltage spikes from the power supply are another known contributor.

Diagnosis requires running Bosch service test program P4, which exercises the motor control system and confirms whether the fault is persistent or intermittent. If P4 confirms the short circuit, the motor control unit must be replaced. Before replacing the MCU, it is also advisable to inspect the wiring harness between the MCU and the drive motor for chafing, pinched insulation, or corroded connectors, as a wiring fault can cause symptoms that mimic an internal board failure.

Source: manufacturer service documentation.

Common causes of dr:01

  1. 01

    Failed motor control unit (MCU)

    Part replacement

    An internal short circuit within the MCU itself, caused by failed transistors, burned PCB traces, or damaged capacitors, is the most direct cause of dr:01. Service test P4 is used to confirm this diagnosis before replacing the board.

  2. 02

    Moisture or detergent contamination on the MCU

    Part replacement

    Water intrusion or detergent residue on the motor control board can create conductive paths between circuits, triggering a short circuit fault. Inspect the board for discoloration, corrosion, or residue buildup.

  3. 03

    Damaged wiring harness between MCU and drive motor

    Wiring / connection

    Chafed, pinched, or corroded wires in the harness connecting the motor control unit to the drive motor can cause a short that registers as an MCU fault. Carefully inspect the full length of the harness for insulation damage or connector corrosion.

  4. 04

    Drive motor drawing excessive current

    Part replacement

    A mechanically failing drive motor with worn or seized bearings can draw current levels high enough to damage the MCU over time. If the motor shows signs of overheating or resistance to rotation, it should be evaluated alongside the control board.

  5. 05

    Voltage spike or power supply event

    Part replacement

    A sudden voltage surge from the household power supply can overwhelm and short circuit components on the motor control board. This is more likely if the error appeared immediately after a power outage or electrical storm.

See the test procedure for each cause

Frequently asked questions about dr:01

What does dr:01 mean on a Bosch washer?
The dr:01 code means the washer has detected a short circuit in the motor control unit (MCU). The MCU is the electronic board that regulates power and speed to the drive motor. When a short circuit is present, the machine stops operation to prevent further electrical damage. This fault requires running service test P4 and, in most cases, replacing the motor control unit.
Can I fix a dr:01 error on my Bosch washer myself?
Diagnosing and repairing a dr:01 error requires running Bosch service test program P4, which is typically performed by a technician using specific diagnostic procedures. A knowledgeable DIYer can inspect the wiring harness and connectors between the MCU and motor for visible damage, but if the fault is confirmed to be an internal short in the MCU, the board must be replaced. Working with high-voltage appliance components carries serious safety risks and is generally not recommended without proper training.
Is it safe to use my Bosch washer when dr:01 is showing?
No, you should not attempt to operate the washer while dr:01 is active. A short-circuited motor control unit can pose a risk of electrical damage to other components or, in rare cases, create a fire or shock hazard. Leave the washer unplugged until it has been inspected and repaired by a qualified technician.
Will resetting my Bosch washer clear the dr:01 error?
A simple power reset will not resolve a dr:01 error if the motor control unit has a genuine short circuit. The fault is hardware-based, meaning it will return immediately or as soon as the machine attempts to run the motor. A reset may temporarily clear the code display, but the underlying electrical fault must be repaired for the error to be permanently resolved.
How much does it cost to repair a Bosch washer dr:01 error?
Repair costs vary depending on whether the issue is a wiring problem or a full motor control unit replacement. Wiring harness repairs tend to be less expensive, generally in the range of $100 to $200 including labor. Replacing the motor control unit itself typically costs between $200 and $450, depending on the specific Bosch model and local labor rates. Getting a diagnostic appointment first is advisable to confirm the exact failed component before committing to parts.

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