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Error code reference

Bosch Washer Error Code dr:08

Motor speed sensor failed

Bosch codesBosch washer codes

Motor speed sensor failed — faulty speed sensor or wire harness.

First step from the service manual

Run test P4; check speed sensor and wire harness.

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

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  • 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
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What dr:08 means on a Bosch washer

The dr:08 error code on a Bosch washer indicates a motor speed sensor failure. The speed sensor, also called a tachometer or Hall sensor depending on the motor type, monitors the rotational speed of the wash motor and reports that data back to the main control board. This feedback loop allows the control board to regulate motor speed precisely throughout each cycle. When the sensor signal is absent, erratic, or out of expected range, the control board logs dr:08 and typically halts the cycle to prevent mechanical damage.

The fault can originate from the sensor itself or from the wiring harness that connects it to the control board. Wiring issues are common because the harness runs near moving components and can suffer chafing, pinched conductors, or connector corrosion over time. A damaged connector pin or an intermittent open circuit in the harness can produce the same fault symptoms as a fully failed sensor, so the harness must be evaluated carefully before replacing the sensor.

Diagnosis should begin with test P4, which is the designated diagnostic routine for the motor speed sensor circuit on affected Bosch models. This test allows a technician to observe sensor output signals and isolate whether the fault is in the sensor, the harness, or the interface at the control board. Visual inspection of the harness for breaks, abrasion, and secure connector seating is an essential part of this process before condemning the sensor itself.

Source: manufacturer service documentation.

Common causes of dr:08

  1. 01

    Damaged or broken wire harness

    Part replacement

    The wiring harness connecting the speed sensor to the control board can become chafed, pinched, or corroded over time, especially where it runs near moving drum components. Inspect the full length of the harness for visible damage and check each connector for bent or corroded pins.

  2. 02

    Failed motor speed sensor

    Part replacement

    The speed sensor itself can fail internally, producing no signal or an erratic signal that the control board cannot interpret. Running test P4 will help confirm whether the sensor output is within the expected range or completely absent.

  3. 03

    Loose or disconnected connector

    Wiring / connection

    Vibration from normal wash cycles can work a connector loose at either the sensor end or the control board end of the harness. Firmly reseating all connectors in the speed sensor circuit may resolve the fault without replacing any parts.

  4. 04

    Corroded connector contacts

    Wiring / connection

    Moisture inside the washer cabinet can cause oxidation on the connector terminals in the sensor circuit, increasing resistance and degrading the signal. Cleaning the contacts and reseating the connectors can restore a proper connection.

  5. 05

    Control board input circuit fault

    Part replacement

    If the harness and sensor both test correctly during the P4 diagnostic routine, the fault may lie in the control board's input circuit for the speed sensor signal. Board replacement is typically a last resort after all other components are ruled out.

See the test procedure for each cause

Frequently asked questions about dr:08

What does dr:08 mean on a Bosch washer?
The dr:08 code means the washer's motor speed sensor has failed or is sending no usable signal to the control board. The control board relies on this sensor to monitor and regulate motor speed throughout each wash cycle. The fault can come from the sensor itself or from the wire harness connecting it to the board. The machine will typically stop the cycle until the issue is resolved.
Can I fix dr:08 on my Bosch washer myself?
Some aspects of this repair are DIY-accessible, such as inspecting the wire harness for visible damage and firmly reseating any loose connectors in the motor speed sensor circuit. However, properly diagnosing the fault requires running Bosch's test P4 diagnostic routine, which requires familiarity with service mode procedures. Replacing the sensor or harness also involves accessing internal components, so comfort with appliance disassembly is necessary.
Is it safe to keep using my Bosch washer with the dr:08 error?
It is not recommended to continue running the washer while dr:08 is active. Without accurate motor speed feedback, the control board cannot properly regulate the motor, which could lead to over-spinning, mechanical stress, or damage to other components. The washer will usually stop the cycle automatically when this fault is detected, which is a protective measure.
How much does it cost to repair a dr:08 error on a Bosch washer?
Repair costs vary depending on the root cause. If only the wire harness needs repair or a connector needs reseating, costs could be minimal, primarily covering labor. A replacement speed sensor typically adds parts costs in the range of $20 to $80. If the control board is at fault, total repair costs including parts and labor could range from $200 to $450 or more depending on the model and service rates in your area.
Will resetting my Bosch washer clear the dr:08 error code?
A power reset may temporarily clear the code from the display, but the fault will return as soon as the washer attempts to run the motor and the control board detects the same missing or invalid speed sensor signal. A reset does not repair the underlying hardware problem. Clearing the code permanently requires diagnosing and correcting the actual fault in the sensor or its wiring circuit.

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