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DTC DATABASE • OBD-II
P0641

Sensor Reference Voltage A Circuit Open

This page explains common reasons this code appears and what should be checked before parts are replaced.

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Common causes

What can trigger P0641?

  • 5V reference short/open
  • Faulty sensor pulling reference down
  • Harness damage
Typical symptoms

What you may notice

  • Multiple sensor faults
  • Limp mode
  • Implausible pressure/position readings

Do not diagnose from the code alone

The code alone does not identify the failed part. Live data, wiring checks and manufacturer-specific subcodes may be required before replacing components.

Full scanLive dataWiring checksSensor plausibilityECU / module communication
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