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Error code reference

Bosch Washer Error Code dr: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 dr:02 means on a Bosch washer

The dr:02 error code on a Bosch washer indicates a motor control interruption, specifically a fault within the motor control unit (MCU). The MCU is the electronic module responsible for regulating the speed, torque, and direction of the drive motor throughout the wash cycle. When the washer's main control board detects that the MCU is not responding correctly or is producing abnormal output signals, it triggers the dr:02 fault and halts operation to prevent further damage.

This fault is distinct from a simple motor failure. The motor itself may be fully functional, but if the MCU cannot properly send or receive control signals, the washer cannot safely operate the drum. Common root causes include internal MCU component failure due to power surges, heat stress, or moisture ingress. Wiring harness issues between the main control board and the MCU can also produce this error, including loose connectors, corroded terminals, or damaged wire insulation.

Diagnosing dr:02 requires running test program P4, which is the diagnostic routine used to evaluate motor control system performance on Bosch washers. If P4 confirms the fault is within the MCU and not a wiring or connector issue upstream, replacement of the motor control unit is the indicated repair. Attempting to clear the code without addressing the underlying hardware fault will result in the error returning once the machine attempts a motor-dependent cycle phase.

Source: manufacturer service documentation.

Common causes of dr:02

  1. 01

    Failed motor control unit (MCU)

    Part replacement

    The MCU itself has developed an internal fault due to component failure, heat stress, or power surge damage. This is the most common cause and is confirmed by running diagnostic test P4.

  2. 02

    Loose or damaged wiring harness connections

    Wiring / connection

    Connectors between the main control board and the MCU can loosen over time or develop corrosion, interrupting the control signal. Inspect all connectors at both ends of the MCU harness for corrosion, bent pins, or unseated connections.

  3. 03

    Power surge damage to the MCU

    Part replacement

    A sudden voltage spike can damage the sensitive electronics within the MCU even if the main control board survives intact. This type of failure often appears suddenly with no prior symptoms.

  4. 04

    Moisture or contamination on MCU terminals

    Wiring / connection

    Water leaking near the MCU housing or excessive humidity can cause short circuits or corrosion on the control board terminals. Visually inspect the MCU and surrounding area for signs of moisture or water staining.

  5. 05

    Main control board communication fault

    Part replacement

    In some cases, the main control board may be sending corrupted signals to the MCU, triggering the error. If the MCU tests correctly during P4 but the fault persists, the main board should be evaluated.

See the test procedure for each cause

Frequently asked questions about dr:02

What does dr:02 mean on a Bosch washer?
The dr:02 code means the washer has detected a motor control interruption, indicating a fault in the motor control unit (MCU). The MCU regulates how the drive motor operates during each cycle, and when communication or function is disrupted, the machine stops and displays this code. It is a hardware-level fault that requires diagnostic testing using test program P4. In most cases, the motor control unit will need to be replaced.
Can I fix a dr:02 error myself?
A knowledgeable DIYer can start by inspecting the wiring harness and connectors leading to the motor control unit for any loose, corroded, or damaged connections. However, running the required P4 diagnostic test and safely replacing the MCU typically requires familiarity with appliance electronics and disassembly procedures. If you are not comfortable working with internal electronic components, a qualified technician is recommended.
Will resetting the washer clear the dr:02 error?
A power reset may temporarily clear the code, but it will return as soon as the washer attempts a cycle phase that requires motor control. The dr:02 fault reflects a hardware issue that a reset cannot resolve. Permanent correction requires diagnosing and repairing or replacing the faulty motor control unit.
Is it safe to use my Bosch washer while dr:02 is displayed?
No, you should not continue using the washer with an active dr:02 fault. The motor control interruption means the machine cannot reliably manage drum operation, which could result in incomplete cycles or further damage to components. The washer should remain out of service until the fault is diagnosed and repaired.
How much does it cost to repair a dr:02 error on a Bosch washer?
Repair costs vary depending on whether the fix involves a wiring correction or a full MCU replacement. If only a connector or harness repair is needed, costs are generally lower, typically in the range of $75 to $150 for a service call. If the motor control unit itself requires replacement, parts and labor combined can range from $200 to $450 or more depending on the specific model and local labor rates.

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