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Home/DTC Codes/Fiat/Cronos/2018-2025 1.3L I4 Flex Firefly/U0302
U0302

Software Incompatibility with TCM

2018-2025 Fiat Cronos 1.3L I4 Flex Firefly

High SeverityNetworkGeneric (SAE)

Description

The data from the Transmission Control Module is incompatible or corrupted.

Symptoms

  • Transmission shift problems
  • Harsh shifting
  • Check Engine Light
  • Transmission warning light

Common Causes

  • TCM software mismatch
  • TCM programming incomplete
  • Wrong TCM calibration
  • TCM-ECM version conflict

Diagnostic Steps

  1. Check TCM software version
  2. Compare ECM and TCM software compatibility
  3. Reprogram TCM
  4. Check for TSBs
  5. Verify correct calibration file

Repair Notes

Reprogram TCM with correct calibration that matches the ECM software version.

Related Codes

U0101Lost Communication with TCMU0301Software Incompatibility with ECM/PCM

Other Network Codes

U0302 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 U0302 mean on a 2018-2025 Fiat Cronos?

U0302 stands for "Software Incompatibility with TCM". The data from the Transmission Control Module is incompatible or corrupted.

What are the symptoms of U0302 on a Fiat Cronos?

Common symptoms of U0302 include: Transmission shift problems, Harsh shifting, Check Engine Light, Transmission warning light.

What causes U0302 on a 2018-2025 Fiat Cronos?

Common causes of U0302 include: TCM software mismatch, TCM programming incomplete, Wrong TCM calibration, TCM-ECM version conflict.

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