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Home/DTC Codes/Fiat/Cronos/2018-2025 1.3L I4 Flex Firefly/U0304
U0304

Software Incompatibility with Cruise Control Module

2018-2025 Fiat Cronos 1.3L I4 Flex Firefly

Moderate SeverityNetworkGeneric (SAE)

Description

Software incompatibility with the cruise control system causing data errors.

Symptoms

  • Cruise control erratic
  • Adaptive cruise not engaging
  • Speed set point drifting
  • Cruise control disabling unexpectedly

Common Causes

  • Cruise module software outdated
  • Software conflict after update
  • Module version mismatch

Diagnostic Steps

  1. Check cruise control module software version
  2. Update module software
  3. Check for known software conflicts
  4. Verify module compatibility

Repair Notes

Update cruise control module software to version compatible with other vehicle modules.

Related Codes

U0104Lost Communication with Cruise Control Module

Other Network Codes

U0304 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 U0304 mean on a 2018-2025 Fiat Cronos?

U0304 stands for "Software Incompatibility with Cruise Control Module". Software incompatibility with the cruise control system causing data errors.

What are the symptoms of U0304 on a Fiat Cronos?

Common symptoms of U0304 include: Cruise control erratic, Adaptive cruise not engaging, Speed set point drifting, Cruise control disabling unexpectedly.

What causes U0304 on a 2018-2025 Fiat Cronos?

Common causes of U0304 include: Cruise module software outdated, Software conflict after update, Module version mismatch.

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