ShopBaseFree forever shop management software for auto repair shops
Try ShopBase Free →
Home/DTC Codes/Fiat/Cronos/2018-2025 1.3L I4 Flex Firefly/B0402
B0402

Tachometer Circuit Malfunction

2018-2025 Fiat Cronos 1.3L I4 Flex Firefly

Low SeverityBodyGeneric (SAE)

Description

The tachometer gauge is not functioning or displays incorrect RPM readings.

Symptoms

  • Tachometer reads zero
  • Tachometer needle erratic
  • Tachometer bouncing at idle
  • Gauge needle stuck

Common Causes

  • Instrument cluster stepper motor failure
  • Cluster circuit board fault
  • RPM signal issue from PCM
  • Wiring problem

Diagnostic Steps

  1. Check RPM signal from PCM with scan tool
  2. Test tachometer stepper motor
  3. Inspect cluster circuit board
  4. Check wiring from PCM to cluster

Repair Notes

Replace instrument cluster stepper motor or circuit board.

Related Codes

B0400Instrument Cluster General MalfunctionB0401Speedometer Circuit Malfunction

Other Body Codes

B0402 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 B0402 mean on a 2018-2025 Fiat Cronos?

B0402 stands for "Tachometer Circuit Malfunction". The tachometer gauge is not functioning or displays incorrect RPM readings.

What are the symptoms of B0402 on a Fiat Cronos?

Common symptoms of B0402 include: Tachometer reads zero, Tachometer needle erratic, Tachometer bouncing at idle, Gauge needle stuck.

What causes B0402 on a 2018-2025 Fiat Cronos?

Common causes of B0402 include: Instrument cluster stepper motor failure, Cluster circuit board fault, RPM signal issue from PCM, Wiring problem.

View Labor Times | View Torque Specs | View Fluid Specs