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 system that helps you brake easily is having trouble. It's like when a bicycle's brakes don't work well because the brake cable is stuck.
The P124A code indicates an issue with the brake booster pump, which is responsible for providing additional force to the brake system, making it easier to stop the vehicle. This code suggests that the pump is not operating correctly or has been permanently turned off.
The brake booster pump is an integral part of the vehicle's braking system, providing vacuum assistance to the brake pedal, making it easier for the driver to apply the brakes. When the P124A code is triggered, it means the pump has been cut off from operation, possibly due to a fault in the pump itself, wiring issues, or a problem in the control module.
• Increased effort required to press the brake pedal
• Reduced braking performance
• Brake warning light on the dashboard
• Faulty brake booster pump
• Electrical wiring issues
• Malfunctioning control module
Brake Booster: A device that uses vacuum pressure to assist in applying the brakes.
Control Module: An electronic component that controls various functions of the vehicle.
• Check for any additional codes and clear them to see if P124A returns.
• Inspect the brake booster pump for physical damage.
• Test the electrical connections and wiring to the pump.
• Replace the brake booster pump if it is faulty.
• Repair or replace damaged wiring or connectors.
• Reprogram or replace the control module if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$200 - $600
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regularly inspect brake system components.
• Ensure electrical connections are secure.
• Perform routine maintenance checks.
Brake System Issue
• Avoid driving the vehicle until the issue is resolved.
• Consult with a professional mechanic for a thorough inspection.
Check with the vehicle manufacturer for warranty coverage on brake system components.
This code has been reported in vehicles with high mileage or those that have experienced harsh driving conditions.
High – Braking performance is crucial for vehicle safety.
Driving with impaired brakes can lead to accidents. Address this issue immediately to ensure safety.
• Vehicle ignition in the ON position
• Brake pedal depressed
The brake booster pump is typically located near the brake master cylinder in the engine bay.
Q: Can I drive with the P124A code?
A: It's not recommended to drive with this code active, as it affects braking performance.
Q: How do I reset the P124A code?
A: Use an OBD-II scanner to clear the code, but ensure the underlying issue is resolved first.
Pro · Four-system diagnostics
A handheld scanner aimed at engine, transmission, ABS, and airbag diagnostic work.
Chassis and ABS faults usually need a scanner that can read brake-system data directly.
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Universal · Torque wrench
Useful when reassembly torque matters for wheel, suspension, and under-hood fasteners.
Useful when wheel, hub, or suspension hardware needs correct reassembly torque.
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Universal · Drive-on ramps
Helpful for safer access underneath the vehicle during exhaust, EVAP, and underbody inspection work.
Helpful for safer access during underbody inspection work.
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