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2000 AUDI A6
2.8L V6•AWD•AUTOMATIC•gas•ACK
4 active safety recalls on this vehicle — view recalls
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Repairs0Labor501Torque3204Fluid9DTC900Battery1Maintenance0Recalls4
P1543high severityPowertrain

Throttle Actuation Potentiometer Signal Out of Range

on 2000 Audi A6 2.8L V6 · AWD

What this code means

The ECU detected that the throttle actuation potentiometer signal is outside the valid voltage range. The ECU uses dual potentiometers for safety and this fault indicates one has drifted or failed.

Symptoms

  • Check Engine Light
  • Reduced power mode
  • Throttle response limited
  • Engine may only idle

Common causes

  • Faulty throttle body potentiometer
  • Carbon buildup affecting sensor
  • Damaged wiring
  • Connector corrosion
  • Throttle body motor failure

Diagnostic steps

  1. Read both throttle position values with scan tool
  2. Check signal voltage range at connector
  3. Clean throttle body
  4. Inspect wiring and connector
  5. Perform throttle body basic setting

Repair notes

Clean throttle body and perform basic setting; replace throttle body if potentiometer has failed.

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