U0401
Invalid Data Received from ECM/PCM
2018-2025 Fiat Cronos 1.3L I4 Flex Firefly
Moderate SeverityNetworkGeneric (SAE)
Description
The data received from the PCM is invalid or corrupted.
Symptoms
- Various warning lights
- Erratic system behavior
Common Causes
- PCM software issue
- CAN bus noise
- PCM failure
- Wiring interference
Diagnostic Steps
- Update PCM software
- Check for TSBs
- Test CAN bus signal quality
- Check for electromagnetic interference
Repair Notes
Reprogram PCM. Check CAN bus.
Related Codes
Other Network Codes
- U0001High Speed CAN Communication Bus
- U0002High Speed CAN Communication Bus Performance
- U0003High Speed CAN Communication Bus (+) Open
- U0004High Speed CAN Communication Bus (+) Low
- U0005High Speed CAN Communication Bus (+) High
- U0006High Speed CAN Communication Bus (-) Open
- U0007High Speed CAN Communication Bus (-) Low
- U0008High Speed CAN Communication Bus (-) High
- U0009High Speed CAN Communication Bus Shorted Together
- U0010Medium Speed CAN Communication Bus
U0401 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 U0401 mean on a 2018-2025 Fiat Cronos?
U0401 stands for "Invalid Data Received from ECM/PCM". The data received from the PCM is invalid or corrupted.
What are the symptoms of U0401 on a Fiat Cronos?
Common symptoms of U0401 include: Various warning lights, Erratic system behavior.
What causes U0401 on a 2018-2025 Fiat Cronos?
Common causes of U0401 include: PCM software issue, CAN bus noise, PCM failure, Wiring interference.