For Shop Owners

P0642 AUDI - Sensor Voltage Circuit 'A' Low Voltage

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3 What does this mean?
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Possible causes

  • Faulty Engine Control Module (ECM)
  • ECM harness is open or shorted
  • ECM circuit poor electrical connection
  • Shorted sensor on 5 volt circuit
What does this mean?

Tech notes

There is a factory service bulletin for the P0642 code for the following models:

2005-2007 Audi A3
2005-2007 Audi A4
2007 Audi A4 Cabriolet
2008 Audi TT

What does this mean?

When is the code detected?

The Engine Control Module (ECM) has detected the sensor 5 volt reference circuit voltage is lower than expected

Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P0642 AUDI Description

The control module has 2 internal 5-volt reference buses called "5-volt reference 1" and"5-volt reference 2". Each reference bus provided 5-volt reference circuit for more than one sensor. Therefore, a fault condition on one 5-volt reference circuit will affect the other 5-volt reference circuits connected to the reference bus. The control module monitors the voltage on the 5-volt reference buses.
OBDII Code P0642 Audi - Sensor Voltage Circuit 'A' Low Voltage -

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P0642 AUDI Comments

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Any information is appreciated. Thanks
Repair Importance Level: 3
1=Low 2=Medium 3=High
Repair Difficulty Level: 3
1=Easy 2=Moderate 3=Hard

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Posted and Edit by 05-01-2017

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