Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
The car's system that helps it move through the air more easily is too cold to work properly.
The code B3A38 indicates that the temperature of the actuator for an active aerodynamic feature is below the normal operating range.
This code is set when the control module detects that the temperature of the actuator responsible for controlling a specific active aerodynamic feature is too low. This can affect the feature's ability to adjust the vehicle's aerodynamics as intended, potentially impacting fuel efficiency and stability.
• Check engine light on
• Reduced aerodynamic efficiency
• Possible decrease in fuel efficiency
• Faulty temperature sensor
• Wiring issues or poor connections
• Actuator malfunction
Actuator: A device that moves or controls a mechanism or system.
Aerodynamics: The study of how air moves around things, like cars.
• Verify the code using an OBD-II scanner.
• Inspect the wiring and connections to the actuator.
• Test the temperature sensor for proper operation.
• Replace the faulty temperature sensor.
• Repair or replace damaged wiring.
• Replace the actuator if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $500
Moderate
• Vehicle 1
• Vehicle 2
• Vehicle 3
• Regular maintenance checks
• Ensure proper electrical connections
• Monitor actuator performance
Sensor Issue
• Have the vehicle inspected by a professional.
• Avoid high-speed driving until the issue is resolved.
Check with the vehicle manufacturer for warranty coverage on actuator components.
This code has been reported in vehicles with advanced aerodynamic systems, especially in colder climates.
Moderate – While not immediately critical, it should be addressed to maintain optimal vehicle performance.
Ignoring this code may lead to reduced vehicle performance and efficiency.
• Vehicle at operating temperature
• Access to the actuator and sensor
The actuator is typically located within the vehicle's body panels or undercarriage, depending on the aerodynamic feature it controls.
Q: What is an active aerodynamic feature?
A: It's a system in the car that adjusts parts like spoilers to improve how the car moves through the air.
Q: Can I drive with this code?
A: Yes, but it's best to fix it soon to keep your car running efficiently.
Pro · Four-system diagnostics
A handheld scanner aimed at engine, transmission, ABS, and airbag diagnostic work.
Body and airbag faults often need a scanner that can access more than generic powertrain codes.
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Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
Helpful for checking power, ground, and continuity in body-system circuits.
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Universal · Fuse kit
Useful for electrical diagnosis when blown fuses or circuit faults are part of the troubleshooting process.
Useful when body electrical faults trace back to blown fuses or shared circuits.
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