P05C7
Economy Mode Switch Circuit/Open
Generic OBD-II
Common symptoms
What you'll notice
- Inspect the economy mode switch circuit for any visible damage or loose connections
- Check and replace any faulty wiring or connectors in the economy mode switch circuit
- Test the economy mode switch for proper functionality and replace if necessary
- Perform a diagnostic scan using an OBD 2 scanner to further pinpoint the exact issue within the economy mode switch circuit
Common causes
Most likely first
- Malfunctioning economy mode switch
- Faulty wiring or connection in the economy mode switch circuit
- Defective economy mode switch sensor
- Damage or corrosion in the economy mode switch circuit
- Issues with the electronic control module (ECM) controlling the economy mode switch
How to diagnose & fix
Work through it in order
- Engine may run in a reduced power mode
- Vehicle may experience difficulty starting
- Fuel efficiency may decrease
- Malfunction indicator lamp (MIL) may illuminate
- Vehicle may fail an emissions test
Read & clear P05C7 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.