P1543high severityPowertrain
Throttle Actuation Potentiometer Signal Out of Range
on 2004-2006 Audi A8 4.2L V8 · 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
- Read both throttle position values with scan tool
- Check signal voltage range at connector
- Clean throttle body
- Inspect wiring and connector
- Perform throttle body basic setting
Repair notes
Clean throttle body and perform basic setting; replace throttle body if potentiometer has failed.
Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
Intake Camshaft Position Timing Over-Advanced Bank 1
P0012
Intake Camshaft Position Timing Over-Retarded Bank 1
P0013
Exhaust Camshaft Position Actuator Circuit/Open Bank 1
P0014
Exhaust Camshaft Position Timing Over-Advanced Bank 1
P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1