Transmission Control Switch Circuit
2016-2021 Mazda CX-3 2.0L I4
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
- Check transmission mode switch signal on scan tool while pressing switch
- Inspect switch connector for corrosion
- Test switch continuity in each position
- Check wiring between switch and PCM
- Verify PCM receives switch signal
Repair Notes
Replace the transmission control switch if it does not change states properly.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
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.