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1998 AUDI A6
2.8L V6•AWD•AUTOMATIC•gas
10 active safety recalls on this vehicle — view recalls
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Repairs0Labor550Torque3432Fluid8DTC645Battery1Maintenance0Recalls10
P1543high severityPowertrain

Throttle Actuation Potentiometer Signal Out of Range

on 1998 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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🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Lexus & Toyota Mechanic · 20+ years. Spot an error? Use the Help link above — a human reads every report.
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