P0884moderate severityPowertrain
TCM Power Input Signal Intermittent
on 2000 Audi A6 2.7L Turbo V6 · AWD
What this code means
The TCM power input signal is cutting in and out intermittently. This is usually a loose connection or chafed wire.
Symptoms
- Intermittent shift faults
- Warning light comes and goes
- Momentary loss of gear selection
Common causes
- Loose or corroded TCM connector
- Chafed or broken wire
- Poor ground connection
- Faulty transmission control module
Diagnostic steps
- Wiggle-test TCM harness while monitoring voltage
- Inspect and clean connectors
- Check grounds for integrity
- Repair intermittent wiring faults
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