What does code P1399 mean on Audi vehicles?
A short to battery positive has been detected in the engine RPM (TD) signal.
OBD-II Code Audi
P1399 — Audi — Engine RPM Signal (TD) Short to B+
A short to battery positive has been detected in the engine RPM (TD) signal.
Common symptoms
- Severe engine malfunctions.
Possible causes
- Faulty wiring.
Initial recommendation
Inspect wiring harness.
Safety notice
This information is for guidance only. Brand-specific codes may vary by model, year, engine, transmission and vehicle configuration. It does not replace a physical inspection or diagnosis by a qualified mechanic. If the vehicle is unsafe to operate, avoid driving it and seek professional inspection.
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