P05C5 — Engine Coolant Pressure Sensor Circuit High

What Does P05C5 Mean?

P05C5 is a diagnostic trouble code indicating: Engine Coolant Pressure Sensor Circuit High. This code relates to the vehicle speed and idle control system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P05C5

⚠️ Check Engine Light (MIL) illuminated
⚠️ Engine Coolant Pressure Sensor reading stuck at maximum value
⚠️ Related system operating erratically or in default mode
⚠️ Erratic idle speed

Common Causes

🔍 Short to voltage in Engine Coolant Pressure Sensor wiring harness
🔍 Corroded or water-damaged Engine Coolant Pressure Sensor connector
🔍 Faulty Engine Coolant Pressure Sensor outputting maximum voltage
🔍 Damaged wiring rubbing against metal components
🔍 ECM/PCM internal fault (rare)

Frequently Asked Questions

What does P05C5 mean?

P05C5 indicates: Engine Coolant Pressure Sensor Circuit High. The vehicle's computer has detected that the Engine Coolant Pressure Sensor is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P05C5?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P05C5 for extended periods may cause additional problems.

How much does it cost to fix P05C5?

Repair costs for P05C5 typically range from $20 to $300, depending on the root cause. Simple wiring or connector repairs are on the lower end, while component replacement costs more. A proper diagnosis ($80–$150 at most shops) will identify the exact cause before committing to expensive parts.

What To Do Next

Possible Fixes

🔧 Inspect and repair Engine Coolant Pressure Sensor wiring for short to voltage
🔧 Clean or replace corroded Engine Coolant Pressure Sensor connector
🔧 Replace faulty Engine Coolant Pressure Sensor

1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

P05C5: Engine Coolant Pressure Sensor Circuit High