P24CE — Reductant Tank Cap Switch Circuit High

What Does P24CE Mean?

P24CE is a diagnostic trouble code indicating: Reductant Tank Cap Switch 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 P24CE

⚠️ Check Engine Light (MIL) illuminated
⚠️ Reductant Tank Cap Switch reading stuck at maximum value
⚠️ Related system operating erratically or in default mode
⚠️ Reduced engine performance

Common Causes

🔍 Short to voltage in Reductant Tank Cap Switch wiring harness
🔍 Corroded or water-damaged Reductant Tank Cap Switch connector
🔍 Faulty Reductant Tank Cap Switch outputting maximum voltage
🔍 Damaged wiring rubbing against metal components
🔍 ECM/PCM internal fault (rare)

Frequently Asked Questions

What does P24CE mean?

P24CE indicates: Reductant Tank Cap Switch Circuit High. The vehicle's computer has detected that the Reductant Tank Cap Switch is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P24CE?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P24CE for extended periods may cause additional problems.

How much does it cost to fix P24CE?

Repair costs for P24CE 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 Reductant Tank Cap Switch wiring for short to voltage
🔧 Clean or replace corroded Reductant Tank Cap Switch connector
🔧 Replace faulty Reductant Tank Cap Switch

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.

P24CE: Reductant Tank Cap Switch Circuit High