P05CA

Symptoms

• Check Engine light is on
• Eco Mode button does not activate economy mode
• Eco mode may stay on all the time (stuck)
• The Eco indicator is not on the display or is constantly on
• Minor change in fuel consumption or engine performance

Causes

• Short circuit of the signal wire of the switch to power (+12V or +5V)
• Insulation damage with a short to an adjacent high-voltage wire
• Switch internal short to power (switch failure)
• Moisture entering the connector, creating a path between the wires
• Poor quality repairs or non-standard additional equipment

How to Fix

1. Read the codes and data of the frozen frame with a scanner, pay attention to the conditions for the appearance of the code
2. Find and inspect the Eco Mode switch, check the connector for moisture and damage
3. Disconnect the switch connector and measure the voltage on the signal wire - if there is voltage without the switch connected, look for a short to power
4. Inspect the wiring harness to the switch for bare spots, chafing, contact with other wires
5. Check the switch itself with a multimeter for internal shorts
6. Repair damaged wiring or replace switch

Related codes

Error P05CA by Vehicle Brand