Code Definition

P1171 — Throttle Actuation Potentiometer Sign. 2 Range/Performance

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Volkswagen

About P1171

P1171 is a manufacturer-specific powertrain diagnostic trouble code recorded for Volkswagen vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P1171 is stored, the module has detected a plausibility fault — the measured value is in the electrical range but is not consistent with expected operating behaviour.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

P1171 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The electronic throttle body contains two independent throttle position potentiometers, or angle sensors, that report the actual position of the throttle plate back to the Engine Control Module (ECM). The two signals move in a defined relationship to each other, usually one rising while the other falls, so that the ECM can continuously check one against the other and detect a faulty signal before it can cause an unwanted throttle movement. DTC P1171 is set when the signal from throttle actuation potentiometer 2 is present but implausible, meaning it is outside its expected range for the comman...

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