What does code P1858 mean on Audi vehicles?
The transmission control module receives an error related to engine speed (RPM) input from the engine control module.
OBD-II Code Audi
P1858 — Audi — Engine Speed Input Circuit Error Message from Engine Control Module
The transmission control module receives an error related to engine speed (RPM) input from the engine control module.
Common symptoms
- Transmission enters limp mode
- harsh or limited shifting
Possible causes
- Erroneous RPM signal
- communication error
- sensor fault
Initial recommendation
Diagnose engine speed signal and engine ECU communication.
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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