mypros+
Error code reference

Bosch Washer Error Code dr:09

Voltage too high

Bosch codesBosch washer codes

Voltage too high — 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.

MyPros+ Max

Get the full diagnostic procedure for dr:09.

  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
Get the full procedure

$29/month · Cancel anytime · Or $9.95 3-day pass

What dr:09 means on a Bosch washer

Error code dr:09 on a Bosch washer indicates that the motor control unit has detected a voltage level that exceeds its acceptable operating threshold. The motor control board is responsible for regulating power delivery to the drive motor, managing speed, torque, and direction during wash and spin cycles. When incoming voltage rises above the designed tolerance range, the motor control's internal protection circuits trigger this fault to prevent component damage.

The root cause is typically a faulty motor control unit that is either misreading voltage levels due to internal component failure, or genuinely receiving over-voltage from the supply line. In either case, the motor control can no longer reliably govern motor operation. A failing motor control board may produce erratic voltage readings internally even when line voltage is within normal range, making board failure the primary suspect in this fault scenario.

Bosch service procedure for dr:09 begins with running diagnostic test P4, which evaluates the motor control system directly. This test helps confirm whether the fault is consistent and board-originated rather than a transient power supply issue. If test P4 confirms the fault, the motor control unit requires replacement. Because this code points specifically to motor control hardware failure, other components such as the wiring harness and motor connections should also be inspected for damage, corrosion, or loose terminals before installing a new board.

Source: manufacturer service documentation.

Common causes of dr:09

  1. 01

    Failed motor control unit

    Part replacement

    The motor control board itself is the most likely culprit. Internal component failure on the board can cause it to incorrectly detect or handle voltage levels, triggering the dr:09 fault even when supply voltage is normal. Diagnostic test P4 is used to confirm this.

  2. 02

    High supply line voltage

    Wiring / connection

    If the household supply voltage is running higher than the washer's rated input tolerance, the motor control will log an over-voltage fault. Measuring line voltage at the outlet with a multimeter can rule this out before replacing the board.

  3. 03

    Damaged or corroded wiring harness

    Wiring / connection

    Loose, corroded, or damaged connectors between the power supply and the motor control board can cause irregular voltage signals that the board interprets as an over-voltage condition. Inspect all harness connections at the motor control unit for signs of damage or oxidation.

  4. 04

    Power surge damage

    Part replacement

    A prior power surge can damage internal circuits on the motor control board, causing it to malfunction and register voltage faults even under normal operating conditions. A history of outages or surges in the home is a useful indicator.

See the test procedure for each cause

Frequently asked questions about dr:09

What does dr:09 mean on a Bosch washer?
The dr:09 code means the washer's motor control unit has detected a voltage level that is too high for safe operation. This is a motor control fault that causes the machine to stop in order to protect internal components. The diagnostic procedure involves running test P4 to evaluate the motor control system, and in most cases the motor control unit will need to be replaced.
Can I fix the dr:09 error myself?
You can start by checking that your wall outlet voltage is within the normal range using a multimeter and inspecting wiring connectors at the motor control board for corrosion or loose terminals. However, running test P4 and replacing the motor control unit typically requires technical experience and familiarity with disassembling Bosch washer cabinets. If you are not comfortable working with appliance electronics, this repair is best handled by a qualified technician.
Is it safe to use my Bosch washer when dr:09 is showing?
No, the washer should not be operated while this fault is active. The dr:09 code indicates a motor control problem involving over-voltage, and continuing to run the machine could cause further damage to the motor control board or related components. Leave the washer unplugged until the fault has been properly diagnosed and repaired.
How much does it cost to repair a dr:09 error on a Bosch washer?
If the motor control unit requires replacement, parts alone typically range from roughly $150 to $400 depending on the specific model. Adding professional labor, total repair costs generally fall in the $250 to $550 range. Getting a diagnostic estimate from a technician before committing to the repair is advisable, especially on older machines.
Will resetting my Bosch washer clear the dr:09 error code?
A power reset may temporarily clear the code, but it will return as soon as the washer attempts to operate if the underlying motor control fault is still present. Because dr:09 points to a hardware failure in the motor control unit, clearing the code without repairing or replacing the faulty board will not resolve the problem. The proper fix requires running diagnostic test P4 and addressing whatever the test reveals.

Related Bosch washer codes

All Bosch washer codes
View all 123 Bosch washer codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass