B1485Lighting
Brake Lamp Circuit Fault
B1485 indicates a fault in the brake lamp circuit. The module detects an open or shorted brake light bulb or wiring, or a brake switch problem.
🚗 Yes, but non-working brake lights are a serious safety concern.
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🎯 Top Causes, Ranked by Likelihood
#1Burned-out brake light bulb$5-$30
A blown brake bulb opens the circuit.
#2Faulty brake light switch$20-$120
A failed pedal switch stops the signal to the lamps.
#3Wiring or socket fault$40-$200
Corroded sockets or broken wires disrupt the circuit.
🩺 Common Symptoms
- Brake lights not working
- Bulb-out warning
- Cruise control disabled
- Shift interlock issues
💰 Repair Cost: DIY vs Shop
📋 Free OBD2 Code Cheat Sheet
The 50 most common codes with likely cause and DIY fix cost. Sent once, no spam.
🔧 How to Diagnose B1485
1Check all brake light bulbs
2Test the brake light switch at the pedal
3Inspect sockets and wiring for corrosion or breaks
4Replace the bulb, switch, or wiring as needed
❓ Frequently Asked Questions
Can I drive with B1485?
You can, but non-working brake lights are dangerous and illegal, so fix them promptly.
Why won't my car shift with B1485?
Many vehicles use the brake switch for shift interlock, so a switch fault can lock the shifter.
What causes B1485?
A blown bulb, a bad brake switch, or wiring and socket faults.
🔗 Related Codes
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