P0641 SAAB - 5 Volt Reference Voltage Incorrect

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

Possible causes

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

When is the code detected?

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

Possible symptoms

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

P0641 Saab 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 P0641 Saab - 5 Volt Reference Voltage Incorrect - Engine-Codes.com

Related Information