Economy Mode Switch Circuit Open
The economy-mode (ECO) switch input has an open circuit. The ECU cannot read whether the driver requested fuel-saving mode (changes throttle map, transmission shift points, climate strategy).
Affected components
- Economy mode switch
Common causes
- High likelihood: Open in switch or harness
- Low likelihood: Pin pushed back out of connector body
- Low likelihood: Cracked solder joint inside the module or sensor
Diagnostic notes
- The malfunction indicator lamp may illuminate
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.