Temperature Gauge Circuit Malfunction
2012-2019 Fiat 500 1.4L I4
Description
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.
Related Codes
Other Body Codes
- B0001Driver Frontal Stage 1 Deployment Control
- B0002Driver Frontal Stage 2 Deployment Control
- B0003Passenger Frontal Stage 1 Deployment Control
- B0004Passenger Frontal Stage 2 Deployment Control
- B0005Driver Knee Airbag Deployment Circuit
- B0006Passenger Knee Airbag Deployment Circuit
- B0007Rear Left Side Airbag Deployment Circuit
- B0008Rear Right Side Airbag Deployment Circuit
- B0009Rear Center Airbag Deployment Circuit
- B0010Driver Side Airbag Deployment
B0404 on Other Vehicles
Fiat 124 Spider
2017-2020 1.4L I4 Turbo
Fiat 126p Maluch
1973-2000 0.65L I2 Air-Cooled
Fiat 126p Maluch
1987-2000 0.7L I2 Air-Cooled
Fiat 500 Abarth
2012-2019 1.4L I4 Turbo
Fiat 500 BR
2011-2020 1.4L I4 Flex Fire Evo
Fiat 500 PL
2007-2025 1.0L I3 Hybrid FireFly 70
Fiat 500 PL
2007-2025 1.2L I4 Fire 69
Fiat 500L
2014-2020 1.4L I4 Turbo
Common Questions
What does code B0404 mean on a 2012-2019 Fiat 500?
B0404 stands for "Temperature Gauge Circuit Malfunction". The engine temperature gauge in the instrument cluster is not functioning or reads incorrectly.
What are the symptoms of B0404 on a Fiat 500?
Common symptoms of B0404 include: Temperature gauge stuck at cold, Gauge stuck at hot, Temperature gauge erratic, No temperature warning capability.
What causes B0404 on a 2012-2019 Fiat 500?
Common causes of B0404 include: Faulty coolant temperature sender for gauge, Cluster gauge failure, Wiring issue, Sender connector corroded.