Code Definition

P1173 — Throttle Actuation Potentiometer Sign. 2 Signal Too High

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

About P1173

P1173 is a manufacturer-specific powertrain diagnostic trouble code recorded for Audi vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P1173 is stored, the module has detected a signal or supply voltage higher than the expected operating range.

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.

P1173 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 position potentiometers that report the actual throttle plate angle to the Engine Control Module (ECM), each supplied with a 5V reference and a sensor ground and returning a signal voltage proportional to plate position. The ECM cross checks the two signals against one another so that a single sensor failure cannot leave it without a trustworthy throttle angle. DTC P1173 is stored when the ECM measures the signal 2 output above its highest valid threshold, commonly above about 4.8V, for longer than the calibrated period. That condition arises when the ...

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