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Error code reference

Bosch Dishwasher Error Code d:09

Voltage too high

Bosch codesBosch dishwasher codes
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What the d:09 error code actually means

Your Bosch dishwasher has detected that the voltage running to its main motor controller is too high, which caused the machine to stop as a safety precaution. This is most often a sign that the motor control board inside the dishwasher has failed and needs to be replaced. A technician will need to run a built-in diagnostic test to confirm the problem before any parts are swapped out.

Diagnostic procedure

The full d:09 procedure

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First diagnostic step
Run test P:04; replace faulty motor control.
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Most common causes of d:09

Ranked by how often they cause this code
  1. 1Faulty motor control board
  2. 2Voltage spike or sustained overvoltage from household supply
  3. 3Loose or corroded wiring connections to the motor control board
  4. 4Failed circulation pump or wash motor creating electrical feedback

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Questions people ask about d:09

What does d:09 mean on a Bosch dishwasher?
The d:09 code means the dishwasher's motor control module has detected a voltage level that is too high for safe operation. This fault is most commonly caused by a failure inside the motor control board itself rather than a problem with your home's electrical supply. The dishwasher stops running to protect its internal components from voltage-related damage. A technician should run the built-in diagnostic test P:04 to confirm the fault before replacing any parts.
Is it safe to use my Bosch dishwasher while it shows a d:09 error?
No, you should not continue running the dishwasher while d:09 is active. The error indicates a voltage fault in the motor control system, and operating the appliance in this condition could cause further damage to the control board or other electrical components. Disconnect the dishwasher from power and have it diagnosed before running another cycle.
Will resetting my Bosch dishwasher clear the d:09 error code?
A power reset may temporarily clear the d:09 code from the display, but it will not resolve the underlying fault. If the motor control board has failed or there is an actual voltage problem, the error will return as soon as the dishwasher attempts to run. The fault needs to be properly diagnosed using test P:04 and the root cause corrected before the machine will operate reliably.
Can I fix a d:09 error on my Bosch dishwasher myself?
Running the diagnostic test P:04 requires familiarity with Bosch service mode procedures, and replacing the motor control board involves working with wiring harnesses and electrical components inside the appliance. A knowledgeable DIYer comfortable with appliance repair can attempt this, but if you are unsure about working with electrical components, a qualified technician is the safer choice. Always disconnect the dishwasher from power before opening any panels.
How much does it cost to repair a Bosch dishwasher with a d:09 error?
If the motor control board requires replacement, parts alone typically range from around $80 to $250 depending on the specific Bosch model. Adding professional labor, the total repair cost generally falls between $150 and $400. Getting a quote from a technician after the P:04 diagnostic is completed will give you a more accurate estimate for your specific unit.

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