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Engine computer and electrics

P0641 Sensor supply voltage has dropped out

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P0641 means: Sensor supply voltage has dropped out. The engine computer supplies 5 V to the sensors. Drive gently and have the car checked soon. The repair usually costs about €60–500 in Estonia. The most common cause: A sensor wire is shorted. Other possible causes: A sensor is shorted internally, connector.

Is it safe to drive?Get it checked soonDrive gently and have the car checked soon.
Typical repair cost€60–500parts and labour in Estonia

What it means

The engine computer supplies 5 V to the sensors. That supply has dropped out or is wrong, so several sensors may give false readings at once.

What could be wrong

  1. 1A sensor wire is shorted
  2. 2A sensor is shorted internally
  3. 3Connector
  4. 4Rarely, the engine computer

What you can check yourself

See whether several warning lights came on at once. Don't drive far, the car may go into limp mode. Best left to a workshop. It needs a diagnostic tool and experience.

How we fix it

  1. We measure the sensor supply voltage
  2. We find the short by unplugging sensors one at a time
  3. We repair the wire or replace the sensor

Standard SAE description: Sensor Reference Voltage A Circuit/Open

Want a definite answer?

Bring the car to our workshop in Estonia for diagnostics. We read the fault codes, test the sensors and tell you what is wrong. Repair price depends on the work involved, generally €45 per hour.

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Questions

What does fault code P0641 mean?

Sensor supply voltage has dropped out. The engine computer supplies 5 V to the sensors. That supply has dropped out or is wrong, so several sensors may give false readings at once.

Can I drive with code P0641?

Drive gently and have the car checked soon.

How much does it cost to fix P0641?

Roughly €60–500 in Estonia. The price depends on exactly what has failed and on the car.

How is P0641 fixed?

We measure the sensor supply voltage. We find the short by unplugging sensors one at a time. We repair the wire or replace the sensor.

Related codes

P0219Engine speed went too highP0600Control modules can't communicate with each otherP0601Fault in the engine computer memoryP0603Engine computer lost its learned valuesP0606Fault in the engine computer processor

This information is general and prices are approximate (Estonian workshop rates). The same code can mean different things on different cars. Only an inspection of the car gives a definite answer.

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