P24C9 — Particulate Matter Sensor Temperature Circuit High

What Does P24C9 Mean?

P24C9 is a diagnostic trouble code indicating: Particulate Matter Sensor Temperature Circuit High. This code relates to the powertrain system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P24C9

⚠️ Check Engine Light (MIL) illuminated
⚠️ Particulate Matter Sensor Temperature reading stuck at maximum value
⚠️ Related system operating erratically or in default mode
⚠️ Reduced engine performance

Common Causes

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

Frequently Asked Questions

What does P24C9 mean?

P24C9 indicates: Particulate Matter Sensor Temperature Circuit High. The vehicle's computer has detected that the Particulate Matter Sensor Temperature is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P24C9?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P24C9 for extended periods may cause additional problems.

How much does it cost to fix P24C9?

Repair costs for P24C9 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 Particulate Matter Sensor Temperature wiring for short to voltage
🔧 Clean or replace corroded Particulate Matter Sensor Temperature connector
🔧 Replace faulty Particulate Matter Sensor Temperature

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.

P24C9: Particulate Matter Sensor Temperature Circuit High