P24D9 — EVAP System Pressure Sensor/Switch B Circuit Intermittent

What Does P24D9 Mean?

P24D9 is a diagnostic trouble code indicating: EVAP System Pressure Sensor/Switch B Circuit Intermittent. This code relates to the powertrain system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P24D9

⚠️ Check Engine Light (MIL) illuminated
⚠️ EVAP System Pressure Sensor/Switch B signal cutting in and out
⚠️ Related system working sometimes but not consistently
⚠️ Reduced engine performance

Common Causes

🔍 Loose or intermittent connection at EVAP System Pressure Sensor/Switch B
🔍 Wire chafing causing intermittent contact
🔍 EVAP System Pressure Sensor/Switch B failing under heat or vibration
🔍 Corroded connector pins with partial contact

Frequently Asked Questions

What does P24D9 mean?

P24D9 indicates: EVAP System Pressure Sensor/Switch B Circuit Intermittent. The vehicle's computer has detected that the EVAP System Pressure Sensor/Switch B is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P24D9?

Yes, P24D9 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 P24D9?

Repair costs for P24D9 typically range from $30 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 reseat all EVAP System Pressure Sensor/Switch B connectors
🔧 Repair chafed or damaged wiring in EVAP System Pressure Sensor/Switch B circuit
🔧 Replace EVAP System Pressure Sensor/Switch B if failing intermittently

1
Find your vehicle above
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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.

P24D9: EVAP System Pressure Sensor/Switch B Circuit Intermittent