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P1780

Transmission Control Switch Circuit

2016-2021 Mazda CX-3 2.0L I4

Low SeverityPowertrain

Description

The PCM has detected a malfunction in the transmission control switch circuit. This switch allows the driver to select between different transmission operating modes such as sport, economy, or winter mode.

Symptoms

  • Check Engine Light
  • Transmission mode selection not working
  • Stuck in one transmission mode
  • Mode indicator light malfunction

Common Causes

  • Faulty transmission mode switch
  • Wiring issue in switch circuit
  • Corroded switch connector
  • PCM input circuit fault
  • Switch mounting issue

Diagnostic Steps

  1. Check transmission mode switch signal on scan tool while pressing switch
  2. Inspect switch connector for corrosion
  3. Test switch continuity in each position
  4. Check wiring between switch and PCM
  5. Verify PCM receives switch signal

Repair Notes

Replace the transmission control switch if it does not change states properly.

Related Codes

P0705Transmission Range Sensor Circuit (PRNDL Input)P0706Transmission Range Sensor Circuit Range/Performance

Other Powertrain Codes

P1780 on Other Vehicles

Common Questions

What does code P1780 mean on a 2016-2021 Mazda CX-3?

P1780 stands for "Transmission Control Switch Circuit". The PCM has detected a malfunction in the transmission control switch circuit. This switch allows the driver to select between different transmission operating modes such as sport, economy, or winter mode.

What are the symptoms of P1780 on a Mazda CX-3?

Common symptoms of P1780 include: Check Engine Light, Transmission mode selection not working, Stuck in one transmission mode, Mode indicator light malfunction.

What causes P1780 on a 2016-2021 Mazda CX-3?

Common causes of P1780 include: Faulty transmission mode switch, Wiring issue in switch circuit, Corroded switch connector, PCM input circuit fault, Switch mounting issue.

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