P0793moderate severityPowertrain
Intermediate Shaft Speed Sensor Circuit No Signal
on 2014 Audi Q7 3.0L Supercharged V6 · AWD
What this code means
No signal is being received from the intermediate shaft speed sensor. The transmission cannot properly determine shaft speed.
Symptoms
- No or delayed shifting
- Transmission stuck in limp mode
- Warning light illuminated
Common causes
- Failed intermediate shaft speed sensor
- Open circuit in sensor wiring
- Corroded or disconnected connector
- Faulty transmission control module
Diagnostic steps
- Scan for no-signal fault confirmation
- Check connector for power and ground
- Test wiring continuity to TCM
- Replace sensor if signal absent
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