P24CD — Reductant Tank Cap Switch Circuit Low

What Does P24CD Mean?

P24CD is a diagnostic trouble code indicating: Reductant Tank Cap Switch Circuit Low. This code relates to the powertrain system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P24CD

⚠️ Check Engine Light (MIL) illuminated
⚠️ Reductant Tank Cap Switch reading at zero or minimum value
⚠️ Related system not functioning or in fail-safe mode
⚠️ Reduced engine performance

Common Causes

🔍 Open or broken wire in Reductant Tank Cap Switch circuit
🔍 Poor ground connection at Reductant Tank Cap Switch
🔍 Faulty Reductant Tank Cap Switch with no output signal
🔍 Disconnected or loose Reductant Tank Cap Switch connector
🔍 Blown fuse in related circuit

Frequently Asked Questions

What does P24CD mean?

P24CD indicates: Reductant Tank Cap Switch Circuit Low. 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 P24CD?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P24CD for extended periods may cause additional problems.

How much does it cost to fix P24CD?

Repair costs for P24CD 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 Reductant Tank Cap Switch circuit
🔧 Clean and secure Reductant Tank Cap Switch connector and ground points
🔧 Replace failed Reductant Tank Cap Switch

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.

P24CD: Reductant Tank Cap Switch Circuit Low