Code Definition

P1289 — Turbosharger bypass valve circuit shorted to ground

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

About P1289

P1289 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 P1289 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) in the monitored circuit.

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.

P1289 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 turbocharger bypass valve, also known as the diverter or recirculation valve, vents charge pressure from the compressor outlet back to the compressor inlet when the throttle closes, preventing compressor surge. The Engine Control Module supplies the valve solenoid with battery voltage and switches the ground side, either driving an electric bypass valve directly or driving a vacuum solenoid, commonly designated N249, that operates a diaphragm valve. Between switching events the module expects the control line to rise back toward battery voltage through the winding, so a line held low tells...

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