Brake Lamp Switch Circuit High
The brake lamp switch signal is too high, impacting brake light operation.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The brake lamp switch detects when you press the brake pedal. When you do, a voltage signal, usually around 0.5 to 2 volts, sends a message to the computer to turn the brake lights on. If this voltage goes too high, the computer thinks there's a fault.
What the computer is actually seeing
The computer sees a brake lamp switch voltage above the normal operating range, typically over 2.5 volts.
What a healthy reading looks like
Expected brake lamp switch voltage is 0.5 to 2.0 volts when the brakes are applied, and 0 volts when not pressed.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Inspect the brake lamp wiring and connectors for damage or corrosion. If damaged, repair or replace the affected components. Decision: Is the wiring intact? Yes: Go to step 2; No: Repair wiring and retest.
Common causes
- Faulty brake lamp switch
- Wiring short to battery voltage
- Damaged connector or pin at the brake lamp switch
- Faulty body control module (BCM)
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
It's advisable to fix this soon as it affects your brake lights, potentially making your vehicle less safe.
Will this code come back after clearing it?
It may return if the underlying issue isn't fixed.
Why is this paired with other codes?
Related codes can indicate issues with the brake switch or wiring in the same circuit.
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