Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer has detected a problem with the button or switch that helps the car save fuel. It's like when a light switch in your house isn't working right.
The P05C7 code is triggered when the vehicle's powertrain control module (PCM) detects an issue with the economy mode switch circuit, indicating an open circuit or disconnection.
The economy mode switch is part of the vehicle's system that allows the driver to select a mode that optimizes fuel efficiency. An open circuit means there is a break in the electrical path, preventing the switch from communicating with the vehicle's control module.
• Economy mode not functioning
• Check engine light illuminated
• Reduced fuel efficiency
• Faulty economy mode switch
• Damaged wiring or connectors
• Faulty PCM
PCM: Powertrain Control Module
OBD-II: On-Board Diagnostics, Second Generation
• Inspect the economy mode switch for physical damage.
• Check the wiring and connectors for continuity and damage.
• Test the PCM for proper function.
• Replace the economy mode switch if faulty.
• Repair or replace damaged wiring or connectors.
• Reprogram or replace the PCM if necessary.
• Multimeter
• OBD-II scanner
• Screwdriver set
$100 - $300
Moderate
• Honda Accord
• Toyota Camry
• Ford Fusion
• Regularly inspect switches and wiring.
• Keep the vehicle's electrical system maintained.
• Avoid excessive moisture exposure.
Sensor Issue
• Avoid using economy mode until the issue is resolved.
• Consult a professional mechanic for diagnosis and repair.
Check with the vehicle manufacturer for warranty coverage on electrical components.
This code has been associated with vehicles that have advanced fuel-saving technologies, often appearing in models with selectable driving modes.
Moderate – It affects fuel efficiency but does not pose an immediate safety risk.
Driving with this code active may not comply with emissions standards in some regions.
• Vehicle in park or neutral
• Engine running
The economy mode switch is typically located on the dashboard or center console.
Q: Can I drive my car with the P05C7 code?
A: Yes, but you may experience reduced fuel efficiency and should have it checked soon.
Q: Will fixing this code improve my gas mileage?
A: Yes, resolving this issue can help restore optimal fuel efficiency.
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