P223B — Reductant Heater F Control Circuit

What Does P223B Mean?

P223B is a diagnostic trouble code indicating: Reductant Heater F Control Circuit. This code relates to the powertrain system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P223B

⚠️ Check Engine Light (MIL) illuminated
⚠️ Erratic Reductant Heater F readings
⚠️ Related system operating intermittently
⚠️ Reduced engine performance

Common Causes

🔍 Wiring issue in Reductant Heater F circuit (damaged, chafed, or corroded)
🔍 Faulty Reductant Heater F connector or terminal
🔍 Failed Reductant Heater F
🔍 ECM/PCM connection issue

Frequently Asked Questions

What does P223B mean?

P223B indicates: Reductant Heater F Control Circuit. The vehicle's computer has detected that the Reductant Heater F is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P223B?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P223B for extended periods may cause additional problems.

How much does it cost to fix P223B?

Repair costs for P223B typically range from $80 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 Heater F wiring and connectors
🔧 Replace faulty Reductant Heater F

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.

P223B: Reductant Heater F Control Circuit