Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This means the car's computer thinks the battery or electric system is giving a weird signal that doesn't make sense.
The code indicates that the vehicle's high voltage system is reporting a voltage level that is outside of the expected range, which the control module deems implausible.
P1B49 is a diagnostic trouble code (DTC) for a high voltage system voltage that is not within the expected parameters as determined by the vehicle's control module. This can be due to discrepancies in the voltage readings from the high voltage battery or related components, suggesting a possible fault in the system's sensors or wiring.
• Check Engine Light is on
• Reduced vehicle performance
• Erratic behavior of the electric system
• Faulty high voltage battery
• Defective voltage sensor
• Wiring issues in the high voltage system
High Voltage System: The electrical system in hybrid and electric vehicles that operates at higher voltages than traditional 12V systems.
Voltage Sensor: A device that measures the voltage level in a circuit.
• Check for any other related DTCs
• Inspect the high voltage battery and connections
• Test the voltage sensor for proper operation
• Replace faulty voltage sensor
• Repair or replace damaged wiring
• Replace high voltage battery if necessary
• OBD-II scanner
• Multimeter
• Insulated tools for high voltage systems
$500 - $2000
Difficult
• Chevrolet Volt
• Nissan Leaf
• Toyota Prius
• Regular maintenance checks
• Ensure high voltage connections are secure
• Monitor battery health regularly
Sensor Issue
• Do not attempt to repair high voltage systems without proper training.
• Consult a professional mechanic for diagnosis and repair.
High voltage system components may be covered under a special warranty for hybrid or electric vehicles.
This code has been associated with issues in early models of hybrid and electric vehicles, often due to sensor inaccuracies.
High – This issue may affect vehicle performance and safety.
Handling high voltage components can be dangerous; always follow safety protocols and consult professionals.
• Vehicle in 'Ready' mode
• All electrical accessories turned off
Typically located near the high voltage battery pack or within the battery management system.
Q: Can I drive my car with this code?
A: It's not recommended as it may lead to further damage or safety issues.
Q: What happens if I ignore this code?
A: Ignoring this code can result in reduced performance and potential safety hazards.
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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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