P01B3 — Alternative Fuel Tank A Level Sensor Circuit Intermittent/Erratic

What Does P01B3 Mean?

P01B3 is a diagnostic trouble code indicating: Alternative Fuel Tank A Level Sensor Circuit Intermittent/Erratic. This code relates to the fuel and air metering system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P01B3

⚠️ Check Engine Light (MIL) illuminated
⚠️ Alternative Fuel Tank A Level Sensor signal cutting in and out
⚠️ Related system working sometimes but not consistently
⚠️ Poor fuel economy

Common Causes

🔍 Loose or intermittent connection at Alternative Fuel Tank A Level Sensor
🔍 Wire chafing causing intermittent contact
🔍 Alternative Fuel Tank A Level Sensor failing under heat or vibration
🔍 Corroded connector pins with partial contact

Frequently Asked Questions

What does P01B3 mean?

P01B3 indicates: Alternative Fuel Tank A Level Sensor Circuit Intermittent/Erratic. The vehicle's computer has detected that the Alternative Fuel Tank A Level Sensor is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P01B3?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P01B3 for extended periods may cause additional problems.

How much does it cost to fix P01B3?

Repair costs for P01B3 typically range from $30 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 reseat all Alternative Fuel Tank A Level Sensor connectors
🔧 Repair chafed or damaged wiring in Alternative Fuel Tank A Level Sensor circuit
🔧 Replace Alternative Fuel Tank A Level Sensor if failing intermittently

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.

P01B3: Alternative Fuel Tank A Level Sensor Circuit Intermittent/Erratic