P04E2: Crankcase Ventilation Hose Connection Sensor Circuit Low

Severity

Low

System

Emission Controls

Last reviewed: Jan 1, 0001 Last updated: Jan 1, 0001

Methodology: We combine code standards with complaint and reliability patterns, then review for clear, vehicle-first diagnosis steps.

Sources: SAE/OBD-II definitions, manufacturer service information, and public reliability reports (including NHTSA where applicable).

Limits: Guidance is informational and may not match every model-year or revision. Confirm with the official manual and diagnostics before replacing parts. For safety-critical or electrical work, use a qualified technician.

What Does P04E2 Mean?

P04E2 is a diagnostic trouble code indicating: Crankcase Ventilation Hose Connection Sensor Circuit Low. 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 P04E2

⚠️ Check Engine Light (MIL) illuminated
⚠️ Crankcase Ventilation Hose Connection Sensor reading at zero or minimum value
⚠️ Related system not functioning or in fail-safe mode
⚠️ Failed emissions test

Common Causes

🔍 Open or broken wire in Crankcase Ventilation Hose Connection Sensor circuit
🔍 Poor ground connection at Crankcase Ventilation Hose Connection Sensor
🔍 Faulty Crankcase Ventilation Hose Connection Sensor with no output signal
🔍 Disconnected or loose Crankcase Ventilation Hose Connection Sensor connector
🔍 Blown fuse in related circuit

Frequently Asked Questions

What does P04E2 mean?

P04E2 indicates: Crankcase Ventilation Hose Connection Sensor Circuit Low. 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 P04E2?

Yes, P04E2 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 P04E2?

Repair costs for P04E2 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

🔧 Repair broken wire or restore ground in Crankcase Ventilation Hose Connection Sensor circuit
🔧 Clean and secure Crankcase Ventilation Hose Connection Sensor connector and ground points
🔧 Replace failed 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.

Related Codes

P0440 EVAP System P0441 EVAP System Incorrect Purge Flow P0442 EVAP System Leak Detected (small leak) P0443 EVAP System Purge Control Valve A Circuit P0444 EVAP System Purge Control Valve A Circuit Open P0445 EVAP System Purge Control Valve A Circuit Shorted P0446 EVAP System Vent Control Circuit P0447 EVAP System Vent Control Circuit Open