Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the sensor that tells the car's computer how much fuel is in the alternative fuel tank is not working properly. It sends signals that are not consistent, making it hard for the car to know how much fuel is left.
The P01B3 code indicates an issue with the fuel level sensor circuit for the alternative fuel tank, where the signal is inconsistent or erratic.
The P01B3 code is triggered when the Powertrain Control Module (PCM) detects an intermittent or erratic signal from the alternative fuel tank's level sensor. This sensor is responsible for providing the PCM with the fuel level information, and an erratic signal can lead to incorrect fuel level readings.
• Check Engine Light is on
• Inaccurate fuel gauge readings
• Possible fuel system performance issues
• Faulty alternative fuel tank level sensor
• Wiring issues or poor connections in the sensor circuit
• Malfunctioning PCM
PCM: Powertrain Control Module, the computer that controls engine and transmission functions.
OBD-II: On-Board Diagnostics, a standardized system for vehicle self-diagnosis and reporting.
• Use an OBD-II scanner to verify the code.
• Inspect the wiring and connections to the fuel level sensor.
• Test the fuel level sensor for proper operation.
• Repair or replace damaged wiring or connectors.
• Replace the faulty fuel level sensor.
• Reprogram or replace the PCM if necessary.
• OBD-II scanner
• Multimeter
• Wrench set
$150 - $400
Moderate
• Chevrolet Volt
• Toyota Prius
• Nissan Leaf
• Regularly inspect and maintain fuel system components.
• Ensure proper connections and wiring integrity.
• Use high-quality fuel to prevent sensor contamination.
Sensor Issue
• Avoid running the vehicle with low fuel to prevent sensor damage.
• Regularly check for updates or recalls related to the fuel system.
Check with the vehicle manufacturer for warranty coverage on fuel system components.
This code has been more prevalent in vehicles with alternative fuel systems as they age, due to sensor wear or wiring issues.
Moderate – While the vehicle may still be operable, inaccurate fuel readings can lead to unexpected fuel depletion.
Ensure the vehicle is safe to drive and complies with emissions regulations. Addressing this issue promptly can prevent further complications.
• Vehicle at operating temperature
• Stable electrical system voltage
The alternative fuel tank level sensor is typically located inside the fuel tank or attached to it.
Q: Can I drive my car with a P01B3 code?
A: While you can drive with this code, it's not recommended as you might not have accurate fuel level readings, which could lead to running out of fuel unexpectedly.
Q: How can I prevent this code from occurring?
A: Regular maintenance and inspections of the fuel system can help prevent issues with the fuel level sensor.
High-End · Full-system diagnostics
A full-system bidirectional platform aimed at advanced DIY users and professional diagnostic workflows.
Network faults often require full-system access instead of a generic code reader alone.
View on Amazon
Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
Helpful for checking voltage drops, grounds, and basic circuit health when modules are not communicating.
View on Amazon
Universal · Wire connectors and repair kit
Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.