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P01B4: Alternative Fuel Rail Temperature Sensor Circuit

Severity
Medium
System
Fuel and Air Metering

What Does P01B4 Mean?

P01B4 is a diagnostic trouble code indicating: Alternative Fuel Rail Temperature Sensor Circuit. 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 P01B4

Common Causes

Frequently Asked Questions

What does P01B4 mean?
P01B4 indicates: Alternative Fuel Rail Temperature Sensor Circuit. The vehicle's computer has detected that the Alternative Fuel Rail Temperature Sensor is not operating within its expected parameters and stored this diagnostic trouble code.
Can I drive with code P01B4?
You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P01B4 for extended periods may cause additional problems.
How much does it cost to fix P01B4?
Repair costs for P01B4 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 Alternative Fuel Rail Temperature Sensor wiring and connectors
  • 🔧 Replace faulty Alternative Fuel Rail Temperature Sensor
  1. 1
    Find your vehicle above

    Click your make and model for real owner reports and common causes specific to your vehicle.

  2. 2
    Check for recalls

    Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.

  3. 3
    Get a professional diagnosis

    A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

Related Codes

P0100 Mass or Volume Air Flow Sensor A Circuit P0101 Mass or Volume Air Flow Sensor A Circuit Range/Performance P0102 Mass or Volume Air Flow Sensor A Circuit Low P0103 Mass Air Flow Circuit High Input P0104 Mass or Volume Air Flow Sensor A Circuit Intermittent P0105 Manifold Absolute Pressure/Barometric Pressure Sensor Circuit P0106 Manifold Absolute Pressure/Barometric Pressure Sensor Circuit Range/Performance P0107 Manifold Absolute Pressure/Barometric Pressure Sensor Circuit Low P0108 Manifold Absolute Pressure/Barometric Pressure Sensor Circuit High P0109 Manifold Absolute Pressure/Barometric Pressure Sensor Circuit Intermittent