AutoCodes – Generic – P1805

P1805 Code - Stop Lamp Switch

Quick Answer

The brake switch signal is applied to the Engine Control Module (ECM) through the stop lamp switch when the brake pedal is depressed. Common causes include Faulty Stop Lamp Switch, Stop Lamp Switch harness is open or shorted, Stop Lamp Switch circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P1805 indicates Stop Lamp Switch.
Common causes: Common causes include Faulty Stop Lamp Switch, Stop Lamp Switch harness is open or shorted, Stop Lamp Switch circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 29,283

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Nov 05, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1805 Description

The brake switch signal is applied to the Engine Control Module (ECM) through the stop lamp switch when the brake pedal is depressed. This signal is used mainly to decrease the engine speed when the vehicle is driving. The Diagnostic Trouble Code (DTC) will be set when the ECM detects a faulty Stop Lamp Switch.

OBDII Code P1805 - Stop Lamp Switch - AutoCodes.com — P1805 Code - Stop Lamp Switch

What does this mean?

What are the Possible Causes of the DTC P1805?

Faulty Stop Lamp Switch
Stop Lamp Switch harness is open or shorted
Stop Lamp Switch circuit poor electrical connection

How to Fix the DTC P1805?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1805 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P1805 code?

Need more information on how to fix the P1805 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1805 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1805 Hyundai — Immobilizer EEPROM Error
P1805 Infiniti — Stop Lamp Switch
P1805 Nissan — Stop Lamp Switch

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1805 Code

1. What are the common symptoms of OBDII code P1805 related to the Stop Lamp Switch?

When the OBDII code P1805 is triggered, common symptoms may include the inability to shift out of park, cruise control not working, and the brake lights staying on constantly.

2. What does the OBDII code P1805 indicate about the Stop Lamp Switch?

OBDII code P1805 specifically points to an issue with the Stop Lamp Switch, which is responsible for activating the brake lights and communicating with the vehicle's computer system.

3. What are the potential causes of OBDII code P1805 involving the Stop Lamp Switch?

The most common causes of OBDII code P1805 related to the Stop Lamp Switch are a faulty switch, misalignment of the switch, or wiring issues in the brake light circuit.

4. How can I diagnose the OBDII code P1805 related to the Stop Lamp Switch?

To diagnose OBDII code P1805, you can start by checking the wiring and connections to the Stop Lamp Switch, testing the switch itself for continuity, and ensuring proper alignment and functionality of the switch.

5. Can I still drive my vehicle with OBDII code P1805 related to the Stop Lamp Switch?

While it may be possible to drive with OBDII code P1805 related to the Stop Lamp Switch, it is not recommended as it can affect the proper operation of the brake lights and potentially lead to safety hazards on the road.

6. How do I repair OBDII code P1805 involving the Stop Lamp Switch?

Repairing OBDII code P1805 related to the Stop Lamp Switch typically involves replacing the faulty switch, correcting any misalignment issues, or repairing damaged wiring in the brake light circuit.

7. Will resetting the OBDII code P1805 related to the Stop Lamp Switch fix the problem?

Resetting the OBDII code P1805 may temporarily clear the error code, but if the underlying issue with the Stop Lamp Switch is not addressed, the code is likely to reappear.

8. Are there any DIY tips for fixing OBDII code P1805 related to the Stop Lamp Switch?

If you are comfortable with automotive repairs, you can attempt to replace the Stop Lamp Switch yourself using basic tools and following the vehicle's repair manual for guidance.

9. Can a malfunctioning Stop Lamp Switch cause other issues besides triggering OBDII code P1805?

Yes, a malfunctioning Stop Lamp Switch can cause other issues such as the inability to start the vehicle, problems with the transmission shifting, or even triggering additional warning lights on the dashboard.

10. How much does it typically cost to repair OBDII code P1805 related to the Stop Lamp Switch?

The cost of repairing OBDII code P1805 related to the Stop Lamp Switch can vary depending on the make and model of the vehicle, the labor rates in your area, and whether you choose to replace the switch yourself or have it done by a professional mechanic.