P05C8

Symptoms

• Check Engine Light Is On
• Economy mode is activated unstable or switches spontaneously
• The Eco Mode button responds to pressing, but the mode is not held
• Unstable operation of functions related to Eco Mode (gas pedal, gear shift)
• Eco indicator appears and disappears periodically on the panel

Causes

• Partial oxidation or contamination of switch contacts
• Worn mechanical contacts inside the switch
• Moisture entering the switch connector, changing the resistance
• Unreliable contact in the connector (intermittent disconnection)
• Initial stage of switch failure

How to Fix

1. Read frozen frame codes and data with a diagnostic scanner
2. Inspect the Eco Mode switch and its connector for moisture, oxidation, and mechanical damage
3. Clean the connector contacts with a special contact agent.
4. Using a multimeter, measure the resistance of the switch in the pressed and released positions and compare with the standard values ​​from the service manual
5. If the resistance deviates from the norm, replace the switch
6. After the repair, erase the codes and check the operation of Eco Mode in real conditions

Related codes

Error P05C8 by Vehicle Brand