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 computer in your car thinks the sensor that measures the temperature of the fuel is reading too high. It's like when a thermometer says it's hotter than it really is.
The P01B7 code is triggered when the Powertrain Control Module (PCM) detects a voltage signal from the alternative fuel rail temperature sensor that is higher than the expected range.
The alternative fuel rail temperature sensor provides the PCM with data regarding the temperature of the fuel in the rail. If the sensor's signal voltage is too high, it could indicate a malfunction in the sensor circuit, such as a short to voltage or an open circuit.
• Check Engine Light illuminated
• Poor fuel economy
• Engine performance issues
• Faulty alternative fuel rail temperature sensor
• Wiring issues such as shorts or opens in the sensor circuit
• Faulty PCM
PCM: Powertrain Control Module, the computer that controls engine and transmission functions.
Fuel Rail: A pipe that delivers fuel to the engine's injectors.
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for damage or corrosion.
• Test the alternative fuel rail temperature sensor with a multimeter.
• Replace the alternative fuel rail temperature sensor if faulty.
• Repair or replace damaged wiring or connectors.
• Reprogram or replace the PCM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$100 - $300
Moderate
• Chevrolet Volt
• Toyota Prius
• Nissan Leaf
• Regular maintenance checks
• Ensure proper wiring insulation
• Use quality fuel
Sensor Issue
• Avoid driving long distances until repaired.
• Monitor fuel economy for any drastic changes.
Check with your vehicle manufacturer for specific warranty coverage on emissions and sensor components.
This code has been more frequently reported in vehicles using alternative fuels, such as hybrids and electric vehicles, due to their unique fuel management systems.
Moderate – It should be addressed soon to avoid potential engine performance issues.
Ignoring this code may lead to increased emissions and potential engine damage. Always ensure your vehicle is safe to drive.
• Engine at operating temperature
• Vehicle stationary
The alternative fuel rail temperature sensor is typically located on the fuel rail itself, which is near the engine.
Q: Can I drive with a P01B7 code?
A: It's possible to drive short distances, but it's best to get it checked soon to avoid further issues.
Q: Will this code affect my fuel economy?
A: Yes, it can lead to poor fuel economy due to incorrect fuel temperature readings.
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