Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means there's a problem with the car's brake booster pump. It's using too much electricity, which can be a sign that something is wrong.
The P123A code indicates that the brake booster pump is drawing more current than expected, which could be due to a malfunction or electrical issue.
The P123A code is triggered when the vehicle's control module detects that the brake booster pump is consuming a higher than normal electrical current. This can indicate a fault in the pump or its control circuitry.
• Brake warning light on the dashboard
• Increased brake pedal effort
• Unusual noises from the brake system
• Faulty brake booster pump
• Electrical short in the pump circuit
• Damaged wiring or connectors
Brake Booster: A device that uses vacuum or hydraulic pressure to assist braking force.
Current: The flow of electrical charge, measured in amperes.
• Inspect the brake booster pump and its wiring for damage.
• Check for any blown fuses related to the brake system.
• Use a multimeter to measure the current draw of the brake booster pump.
• Replace the faulty brake booster pump.
• Repair or replace damaged wiring or connectors.
• Ensure all connections are secure and free of corrosion.
• Multimeter
• OBD-II scanner
• Basic hand tools
$200 - $600
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regularly inspect brake system components.
• Ensure electrical connections are clean and secure.
• Perform routine maintenance as per the vehicle's schedule.
Electrical Issue
• Do not ignore the brake warning light.
• Have the brake system inspected by a professional if unsure.
• Avoid driving the vehicle if the brakes feel unsafe.
Check with the vehicle manufacturer for warranty coverage on brake components.
This code has been reported in vehicles with electronic brake booster systems, particularly in models with higher mileage.
High – Brake issues can affect vehicle safety and should be addressed promptly.
Driving with a malfunctioning brake system can be dangerous and may violate road safety laws.
• Vehicle at operating temperature
• Brake system engaged
The brake booster pump is typically located near the firewall in the engine compartment.
Q: Can I drive with a P123A code?
A: It's not recommended to drive with a P123A code as it can affect braking performance.
Q: How do I reset the P123A code?
A: After repairs, use an OBD-II scanner to clear the code, but ensure the issue is fixed 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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