P1805Manufacturer-specific code

P1805 Code: Brake Switch (Nissan)

On Nissan and Infiniti vehicles, the P1805 code points to the brake switch. The brake lights may not work and the shift lever may not come out of park. Other brands may define this number differently.

Severity
Medium
Can I keep driving?
Yes, but with caution
Estimated cost
$10 to $100
Difficulty
Easy
System
Idle and Speed Control
Applies to
Depends on the manufacturer

Common in: Nissan

Updated Reviewed by Renzo Chacca

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What the P1805 code means

P1805 is a manufacturer-specific code: the 1 in the second position means each automaker defines what it means, not the generic SAE standard. The most widespread definition is the one used by Nissan and Infiniti. If your vehicle is another brand, confirm the code text with a scan tool that supports that manufacturer.

ManufacturerMeaning of P1805
Nissan and InfinitiBrake switch

The computer uses the brake switch for cruise control, the shift lever lock and some engine and transmission strategies.

The computer sets the P1805 code when the switch signal does not change when you brake or stays active without braking.

Before you start repairs, confirm the make, model, year and engine. With manufacturer codes, the same number can change even between engines from the same brand.

P1805 code symptoms

  • Brake lights that do not work.
  • The shift lever will not come out of P.
  • Check engine light on.

Likely causes of the P1805 code

  1. Switch out of adjustment. Confirm it with the tests in the diagnosis section.
  2. Failed switch. Confirm it with the tests in the diagnosis section.
  3. Fuse. Confirm it with the tests in the diagnosis section.
  4. Broken pedal stopper. Confirm it with the tests in the diagnosis section.

How to diagnose the P1805 code step by step

  1. Check the brake lights.
  2. Read the switch state on the scan tool.
  3. Adjust the switch and test again.

How to fix the P1805 code

  • Adjust or replace the switch.

Technical reference data

  • There are usually two switches, or one switch with two circuits.
  • P1xxx codes are manufacturer-specific: confirm the definition with a scan tool that supports your brand.
  • Reference values: check the manufacturer data for your vehicle.

Brand-specific notes

Check the brake lights first. Without them you have a safety issue and a ticket risk on top of the code.

P1805 on Nissan

Common on the Sentra, Tsuru, Tiida, Versa, March, X-Trail, Altima and Frontier.

If your vehicle is another brand, check the table above for the meaning its manufacturer gives this code and confirm it with a compatible scan tool.

Frequently asked questions about P1805

What does the P1805 code mean on a Nissan?
It points to the brake switch. The shift lever may not come out of park.
Does P1805 mean the same thing on every brand?
No. It is a manufacturer-specific code, so on other brands it may not exist or may mean something different. Confirm it with a scan tool that supports your make.
Can I drive with a P1805 code?
Yes, but with caution. With a P1805 code, make sure the brake lights work before you drive.
How much does it cost to fix P1805?
Roughly $10 to $100 on a Nissan. The switch, a fuse and a pedal stopper are all inexpensive parts.
Will a P1805 code clear itself?
Not while the switch is out of adjustment or failed. After the repair, clear the code and confirm the brake lights work.
What is the most common cause of P1805?
A brake switch that is out of adjustment or has failed. A blown fuse and a broken pedal stopper come next.

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Questions about the P1805 code

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