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 car's computer has detected a problem with the electrical circuit that controls a valve used to switch between different fuel tanks. It's like a switch that isn't working right.
The P2A98 code is triggered when the powertrain control module (PCM) detects a high voltage condition in the control circuit of the alternative fuel tank select valve B.
The alternative fuel tank select valve B is responsible for switching between different fuel sources in vehicles equipped with multiple fuel tanks. A high circuit condition indicates that the voltage is higher than expected, which could be due to a wiring issue, a faulty valve, or a problem with the PCM.
• Check Engine Light is on
• Inability to switch between fuel tanks
• Possible fuel smell
• Reduced engine performance
• Faulty alternative fuel tank select valve B
• Open or shorted wiring in the valve circuit
• Poor electrical connection in the circuit
• Faulty PCM
PCM: Powertrain Control Module, the computer that controls engine and transmission functions.
Valve: A device that controls the flow of fluid or gas.
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for damage or corrosion.
• Test the alternative fuel tank select valve B for proper operation.
• Check the PCM for any faults.
• Repair or replace damaged wiring or connectors.
• Replace the alternative fuel tank select valve B if faulty.
• Reprogram or replace the PCM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $500
Moderate
• Chevrolet Volt
• Toyota Prius
• Ford Fusion Hybrid
• Regularly inspect wiring for wear and tear.
• Ensure proper maintenance of fuel system components.
• Keep the vehicle's software updated.
Sensor Issue
• Avoid driving the vehicle until the issue is resolved to prevent further damage.
• Consult a professional mechanic for accurate diagnosis and repair.
Check with your vehicle manufacturer to see if this issue is covered under warranty, especially if your vehicle is still under the powertrain warranty.
This code is relatively rare and typically appears in vehicles with dual fuel systems or alternative fuel capabilities.
Moderate – It should be addressed soon to avoid potential fuel system issues.
Driving with a malfunctioning fuel system component can lead to safety hazards. Ensure repairs are conducted by a qualified professional.
• Vehicle must be running.
• Alternative fuel system must be engaged.
The alternative fuel tank select valve B is typically located near the fuel tanks or along the fuel line.
Q: Can I drive with the P2A98 code?
A: It's not recommended to drive with this code as it can lead to fuel system issues and potentially unsafe driving conditions.
Q: How can I prevent this code from appearing again?
A: Regular maintenance and inspection of the fuel system and electrical connections can help prevent this code.
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.