P04E3 — Crankcase Ventilation Hose Connection Sensor Circuit High

What Does P04E3 Mean?

P04E3 is a diagnostic trouble code indicating: Crankcase Ventilation Hose Connection Sensor Circuit High. This code relates to the emission controls system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P04E3

⚠️ Check Engine Light (MIL) illuminated
⚠️ Crankcase Ventilation Hose Connection Sensor reading stuck at maximum value
⚠️ Related system operating erratically or in default mode
⚠️ Failed emissions test

Common Causes

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

Frequently Asked Questions

What does P04E3 mean?

P04E3 indicates: Crankcase Ventilation Hose Connection Sensor Circuit High. The vehicle's computer has detected that the Crankcase Ventilation Hose Connection Sensor is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P04E3?

Yes, P04E3 is generally safe to drive with in the short term. However, it should still be addressed to pass emissions testing and prevent potential secondary issues.

How much does it cost to fix P04E3?

Repair costs for P04E3 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 Crankcase Ventilation Hose Connection Sensor wiring for short to voltage
🔧 Clean or replace corroded Crankcase Ventilation Hose Connection Sensor connector
🔧 Replace faulty Crankcase Ventilation Hose Connection 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.

P04E3: Crankcase Ventilation Hose Connection Sensor Circuit High