P23B2: NOx Sensor Heater Control Circuit Low Bank 1 Sensor 3
Severity
Medium
System
Powertrain
What Does P23B2 Mean?
P23B2 is a diagnostic trouble code indicating: NOx Sensor Heater Control Circuit Low Bank 1 Sensor 3. This code relates to the powertrain system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.
Symptoms of P23B2
- ⚠️ Check Engine Light (MIL) illuminated
- ⚠️ NOx Sensor Heater 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 NOx Sensor Heater circuit
- 🔍 Poor ground connection at NOx Sensor Heater
- 🔍 Faulty NOx Sensor Heater with no output signal
- 🔍 Disconnected or loose NOx Sensor Heater connector
- 🔍 Blown fuse in related circuit
Frequently Asked Questions
What does P23B2 mean?
P23B2 indicates: NOx Sensor Heater Control Circuit Low Bank 1 Sensor 3. The vehicle's computer has detected that the NOx Sensor Heater is not operating within its expected parameters and stored this diagnostic trouble code.
Can I drive with code P23B2?
You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P23B2 for extended periods may cause additional problems.
How much does it cost to fix P23B2?
Repair costs for P23B2 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 NOx Sensor Heater circuit
- 🔧 Clean and secure NOx Sensor Heater connector and ground points
- 🔧 Replace failed NOx Sensor Heater
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1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
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2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
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3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.
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