P0812moderate severityPowertrain
Reverse Input Circuit
on 2024 Audi RS7 4.0L Twin-Turbo V8 · AWD
What this code means
A fault was detected in the reverse input signal circuit to the transmission control system. This can affect reverse gear engagement and reverse-related functions.
Symptoms
- No or delayed reverse engagement
- Reverse lights malfunction
- Warning light illuminated
Common causes
- Faulty reverse switch or sensor
- Wiring or connector fault
- Short or open in reverse circuit
- Control module fault
Diagnostic steps
- Read transmission fault codes
- Inspect reverse switch and wiring
- Verify signal when selecting reverse
- Repair circuit or replace switch
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