P1805
Stop Lamp Switch
P1805 is an OBD-II diagnostic trouble code meaning: Stop Lamp Switch. Common causes: faulty brake light sensor, open or short circuit in wiring. Estimated repair cost: $6–28.
Symptoms
- Cruise control doesn't work
- Problems starting the engine (on some models)
- Check Engine Light Is On
- Incorrect operation of the ABS system
- Brake lights do not turn on or are constantly on
Causes
- Faulty brake light sensor
- Open or short circuit in wiring
- Oxidized contacts in connectors
- Problems with the brake pedal
- Engine control unit malfunction
How to Fix
- Check the operation of the brake lights
- Inspect the sensor wiring and connectors
- Check the brake light sensor with a multimeter
- Replace the faulty sensor if necessary
- Check and clean contacts in connectors
Related codes
FAQ
What does the P1805 code mean?
P1805 is an OBD-II diagnostic trouble code that indicates: Stop Lamp Switch
What causes a P1805 error code?
The most common causes of P1805 include: Faulty brake light sensor; Open or short circuit in wiring; Oxidized contacts in connectors; Problems with the brake pedal.
How do I fix a P1805 diagnostic trouble code?
To fix P1805: Check the operation of the brake lights. Inspect the sensor wiring and connectors. Check the brake light sensor with a multimeter. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P1805?
Do not drive — repair immediately
How much does it cost to fix P1805?
The estimated repair cost for P1805 is $6–28. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat