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Home/DTC Codes/Fiat/Cronos/2018-2025 1.0L I4 Flex Firefly/P0740
P0740

Torque Converter Clutch Circuit Malfunction

2018-2025 Fiat Cronos 1.0L I4 Flex Firefly

Moderate SeverityPowertrainGeneric (SAE)

Description

Malfunction in the torque converter clutch (TCC) solenoid circuit.

Symptoms

  • Check Engine Light
  • No lockup feel (higher RPM at highway)
  • Poor fuel economy
  • Transmission overheating

Common Causes

  • Faulty TCC solenoid
  • Wiring issue
  • PCM driver failure
  • Torque converter failure

Diagnostic Steps

  1. Test TCC solenoid resistance
  2. Check wiring
  3. Command TCC engagement with scan tool
  4. Monitor RPM drop during lockup command

Repair Notes

Replace TCC solenoid or repair wiring. Solenoid is often inside transmission.

Related Codes

P0741Torque Converter Clutch Circuit Performance/Stuck OffP0742Torque Converter Clutch Circuit Stuck On

Other Powertrain Codes

P0740 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 P0740 mean on a 2018-2025 Fiat Cronos?

P0740 stands for "Torque Converter Clutch Circuit Malfunction". Malfunction in the torque converter clutch (TCC) solenoid circuit.

What are the symptoms of P0740 on a Fiat Cronos?

Common symptoms of P0740 include: Check Engine Light, No lockup feel (higher RPM at highway), Poor fuel economy, Transmission overheating.

What causes P0740 on a 2018-2025 Fiat Cronos?

Common causes of P0740 include: Faulty TCC solenoid, Wiring issue, PCM driver failure, Torque converter failure.

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