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P1543

Throttle Actuation Potentiometer Signal Out of Range

2000-2004 Porsche Boxster 2.7L H6

High SeverityPowertrain

Description

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.

Related Codes

P0120Throttle/Pedal Position Sensor/Switch A Circuit P0121Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance P1171Fuel System Lean During Acceleration P1171Fuel System Lean During Acceleration P1171Fuel System Lean During Acceleration P1171Fuel System Lean During Acceleration P1171Fuel System Lean During Acceleration P1171Fuel System Lean During Acceleration P1171Fuel System Lean During Acceleration P1171Long Term Fuel Trim Upper Limit Lean P1171Fuel System Lean During Acceleration P1171Throttle Actuation Potentiometer Signal 2 Range P1171Throttle Actuation Potentiometer Signal 2 Range P1171Throttle Actuation Potentiometer Signal 2 Range P1171Throttle Actuation Potentiometer Signal 2 Range P1171Throttle Actuation Potentiometer Signal 2 Range P1544Throttle Actuation Potentiometer Signal Too High P1544Throttle Actuation Potentiometer Signal Too High P1544Throttle Actuation Potentiometer Signal Too High P1544Throttle Actuation Potentiometer Signal Too High P1544Throttle Actuation Potentiometer Signal Too High P1545Throttle Position Control Malfunction P1545Throttle Position Control Malfunction P1545Throttle Position Control Error P1545Throttle Position Control Malfunction P1545Throttle Position Control Malfunction P1545Throttle Position Control Error P1545Throttle Position Control Malfunction

Other Powertrain Codes

P1543 on Other Vehicles

Common Questions

What does code P1543 mean on a 2000-2004 Porsche Boxster?

P1543 stands for "Throttle Actuation Potentiometer Signal Out of Range". 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.

What are the symptoms of P1543 on a Porsche Boxster?

Common symptoms of P1543 include: Check Engine Light, Reduced power mode, Throttle response limited, Engine may only idle.

What causes P1543 on a 2000-2004 Porsche Boxster?

Common causes of P1543 include: Faulty throttle body potentiometer, Carbon buildup affecting sensor, Damaged wiring, Connector corrosion, Throttle body motor failure.

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