P0881moderate severityPowertrain
TCM Power Input Signal Range/Performance
on 2003 Audi A6 3.0L V6 · AWD
What this code means
The TCM power input signal is out of its normal range or behaving erratically. Voltage is present but not steady or correct.
Symptoms
- Intermittent shifting problems
- Transmission warning light on
- Occasional limp mode
Common causes
- Loose or corroded power connections
- Voltage drop in supply wiring
- Weak battery or charging issue
- Faulty transmission control module
Diagnostic steps
- Inspect and clean TCM power connectors
- Check battery and charging system voltage
- Monitor TCM supply voltage under load
- Repair any damaged supply wiring
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