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 found a problem with the battery in a hybrid or electric car. It's like when a flashlight doesn't work because the batteries are too weak.
The vehicle's control module has detected a low voltage condition in the circuit associated with battery module 'B'.
The P1B98 code is triggered when the Battery Energy Control Module (BECM) detects a voltage level below the expected threshold in the battery module 'B' circuit. This could be due to a fault in the battery module itself, its wiring, or related components.
• Check engine light on
• Reduced fuel efficiency
• Limited driving range
• Faulty battery module 'B'
• Poor electrical connections
• Damaged wiring or connectors
BECM: Battery Energy Control Module
OBD-II: On-Board Diagnostics, Second Generation
• Use a scan tool to verify the code.
• Inspect the battery module 'B' and its wiring for damage.
• Check electrical connections for corrosion or looseness.
• Replace or repair faulty battery module 'B'.
• Repair or replace damaged wiring or connectors.
• Ensure all connections are clean and secure.
• OBD-II scanner
• Multimeter
• Basic hand tools
$500 - $2000
Moderate
• Toyota Prius
• Chevrolet Volt
• Nissan Leaf
• Regularly inspect battery connections.
• Keep the battery compartment clean and dry.
• Perform regular maintenance checks.
Battery Circuit Issue
• Avoid driving long distances until the issue is resolved.
• Consult a professional mechanic for a thorough inspection.
Battery issues may be covered under the vehicle's hybrid/EV warranty.
This code has become more common with the increase in hybrid and electric vehicles.
Moderate – While the vehicle may still operate, performance and efficiency are affected.
Driving with a compromised battery system may affect vehicle safety and emissions compliance.
• Vehicle in 'ready' mode
• Battery system under load
Battery module 'B' is typically located within the vehicle's main battery pack, often under the rear seats or trunk area.
Q: Can I drive my car with this code?
A: It's possible, but not recommended as it may affect performance and efficiency.
Q: Will this code reset itself?
A: The code may reset if the issue is intermittent, but it's best to have it checked by a professional.
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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.
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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.
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