Brake Switch Circuit Range/Performance Problem
There’s an issue with the brake switch circuit performance.
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 switch isn’t sending the right info to the computer about whether you are pressing the brake or not, causing problems with systems like the cruise control or traction control that rely on that signal.
What the computer is actually seeing
The computer monitors the voltage change from the brake switch. Normally, pressing the brake should show around 0.5V to 1.0V when active. If it stays high (like 2.0V) or erratic, it triggers the code.
What a healthy reading looks like
A properly functioning brake switch should show between 0V (released) and 0.5V (pressed) with an expected change when you apply the brake pedal.
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.
- 1Check the brake fluid level and make sure it’s in the proper range. If low, fill it and see if the code returns.
- 2Inspect the brake switch for physical damage or wear. Ensure it’s mounted correctly and moves freely.
- 3Using a multimeter, check the voltage at the brake switch when the brake pedal is pressed. You should see a drop to under 1V. If not, replace the switch.
- 4Examine the wiring and connectors leading to the brake switch for corrosion or breaks. Repair any issues found and re-test.
Common causes
- Faulty brake switch
- Wiring issues in the brake switch circuit
- Connector corrosion or damage
- Bad ground connection for brake switch
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, but you may lose functions like cruise control or stability control until it’s fixed.
Will this issue come back after repair?
If the underlying cause is properly addressed, it should not return.
Why is this code affecting my cruise control?
The brake switch signals when the brake is applied, which is crucial for safe operation of cruise control.
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