Instrument Cluster General Malfunction
2018-2025 Fiat Cronos 1.0L I4 Flex Firefly
Description
A general fault detected in the instrument cluster module. Multiple gauges or indicators may be affected.
Symptoms
- Multiple gauges not working
- Instrument cluster dark
- Gauges reading incorrectly
- Warning lights erratic
- Odometer display blank
Common Causes
- Instrument cluster internal failure
- Power supply issue to cluster
- Communication bus fault
- Corroded cluster connector
- Software corruption
Diagnostic Steps
- Check cluster power and ground
- Scan cluster for stored codes
- Test CAN bus communication to cluster
- Inspect cluster connector for corrosion
- Attempt cluster self-test if available
Repair Notes
Replace instrument cluster or repair power supply. Cluster may need to be programmed with vehicle mileage.
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
B0400 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
2012-2019 1.4L I4
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
Common Questions
What does code B0400 mean on a 2018-2025 Fiat Cronos?
B0400 stands for "Instrument Cluster General Malfunction". A general fault detected in the instrument cluster module. Multiple gauges or indicators may be affected.
What are the symptoms of B0400 on a Fiat Cronos?
Common symptoms of B0400 include: Multiple gauges not working, Instrument cluster dark, Gauges reading incorrectly, Warning lights erratic, Odometer display blank.
What causes B0400 on a 2018-2025 Fiat Cronos?
Common causes of B0400 include: Instrument cluster internal failure, Power supply issue to cluster, Communication bus fault, Corroded cluster connector, Software corruption.