P05C2

Symptoms

• Check Engine Light Is On
• Possible engine emergency mode with power limitation
• Coolant temperature readings may be unstable
• Cooling system warning on instrument panel
• In rare cases, engine overheating when the protection system is not working

Causes

• Faulty coolant pressure sensor
• Open or short circuit in sensor wiring
• Poor contact or corrosion in the sensor connector
• Coolant leak leading to pressure drop
• ECU malfunction (extremely rare)

How to Fix

1. Connect the diagnostic scanner, read all codes and frozen frame data
2. Check the level and condition of the coolant in the expansion tank
3. Inspect the coolant pressure sensor and its connector for damage or corrosion.
4. Check the sensor wiring with a multimeter: 5V power supply, ground, integrity of the signal wire
5. Check the sensor readings with a scanner in real time and compare with the actual pressure
6. Replace the sensor if it is confirmed to be faulty after eliminating wiring problems

Related codes

Error P05C2 by Vehicle Brand