B0404low severityBody
Temperature Gauge Circuit Malfunction
on 2003 Audi A6 2.7L Turbo V6 · AWD
What this code means
The engine temperature gauge in the instrument cluster is not functioning or reads incorrectly.
Symptoms
- Temperature gauge stuck at cold
- Gauge stuck at hot
- Temperature gauge erratic
- No temperature warning capability
Common causes
- Faulty coolant temperature sender for gauge
- Cluster gauge failure
- Wiring issue
- Sender connector corroded
Diagnostic steps
- Check coolant temp sender resistance
- Test gauge with simulated resistance
- Inspect sender connector
- Compare scan tool temp to gauge reading
Repair notes
Replace coolant temperature sender for gauge (separate from ECT sensor) or repair cluster.
Other Body codes on this vehicle
B0001
Driver Frontal Stage 1 Deployment Control
B0002
Driver Frontal Stage 2 Deployment Control
B0003
Passenger Frontal Stage 1 Deployment Control
B0004
Passenger Frontal Stage 2 Deployment Control
B0005
Driver Knee Airbag Deployment Circuit
B0006
Passenger Knee Airbag Deployment Circuit
B0010
Driver Side Airbag Deployment
B0011
Driver Side Airbag Deployment Circuit Open
B0012
Driver Side Airbag Deployment Circuit Short to Ground
B0013
Driver Side Airbag Deployment Circuit Short to Battery