P2C78

Symptoms

• Check Engine light comes on
• Reduced engine cooling efficiency
• Increased fuel consumption
• Noises from the radiator grille area
• Engine power limitation on some models

Causes

• Mechanical jamming of the active grille flaps
• Problems with the electrical wiring to the module (break or short circuit)
• Damper control module malfunction
• Overheating due to contamination or obstructions
• Module power problems

How to Fix

1. Visual inspection of the valves and mechanism for jamming
2. Checking electrical connections and wiring to the module
3. Module supply voltage diagnostics
4. Cleaning the damper mechanism from dirt
5. Replacing a faulty control module if necessary

Related codes

Error P2C78 by Vehicle Brand