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Home/DTC Codes/Fiat/Cronos/2018-2025 1.3L I4 Flex Firefly/U0142
U0142

Lost Communication with Body Control Module B

2018-2025 Fiat Cronos 1.3L I4 Flex Firefly

Moderate SeverityNetworkGeneric (SAE)

Description

Cannot communicate with the secondary body control module.

Symptoms

  • Partial body electronics failure
  • Some lights not working
  • Partial lock/unlock failure
  • Specific body features down

Common Causes

  • BCM B failure
  • CAN bus wiring issue
  • Module power loss
  • Fuse blown
  • Water damage

Diagnostic Steps

  1. Check BCM B fuse
  2. Test power and ground
  3. Check CAN wiring
  4. Inspect for water damage
  5. Check BCM B connector

Repair Notes

Check fuses and look for water intrusion. Secondary BCMs are common on larger vehicles.

Related Codes

U0140Lost Communication with Body Control Module

Other Network Codes

U0142 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 U0142 mean on a 2018-2025 Fiat Cronos?

U0142 stands for "Lost Communication with Body Control Module B". Cannot communicate with the secondary body control module.

What are the symptoms of U0142 on a Fiat Cronos?

Common symptoms of U0142 include: Partial body electronics failure, Some lights not working, Partial lock/unlock failure, Specific body features down.

What causes U0142 on a 2018-2025 Fiat Cronos?

Common causes of U0142 include: BCM B failure, CAN bus wiring issue, Module power loss, Fuse blown, Water damage.

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