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Engine-Codes – Generic – P1805

P1805 Code - Stop Lamp Switch

Quick Answer

The P1805 diagnostic trouble code relates to the stop lamp switch in a vehicle. Common causes include Faulty stop lamp switch, Wiring issues, Poor connection between the switch and the ECM. 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, Wiring issues, Poor connection between the switch and the ECM.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 07, 2024
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Code P1805 Description

The P1805 diagnostic trouble code relates to the stop lamp switch in a vehicle. The stop lamp switch is a crucial component that informs the vehicle's electronic control module (ECM) when the brake pedal is pressed, signaling the vehicle to activate the brake lights. When this switch malfunctions or fails, it can lead to various issues affecting the vehicle's performance and safety.

OBDII Code P1805 - Stop Lamp Switch
P1805 Code - Stop Lamp Switch

Common Causes of P1805

  1. Faulty stop lamp switch
  2. Wiring issues
  3. Poor connection between the switch and the ECM
  4. Corrosion or damage to the switch

Symptoms of P1805

  1. Brake lights not illuminating when the brake pedal is pressed
  2. Inability to shift out of park
  3. Check Engine Light (CEL) illuminated on the dashboard
  4. Vehicle experiencing starting issues
  5. Cruise control not working properly

How to Fix P1805

  1. Locate the stop lamp switch: The switch is typically located near the brake pedal. Refer to the vehicle's manual for specific instructions.
  2. Test the switch: Use a multimeter to test the continuity of the switch when the brake pedal is pressed. If there is no continuity, the switch is faulty.
  3. Replace the switch: If the switch is determined to be faulty, disconnect the wiring harness and remove the old switch. Install a new switch and reconnect the wiring harness.
  4. Test the repair: Press the brake pedal and verify that the brake lights illuminate. Ensure that the vehicle can shift out of park and that all related systems are functioning properly.

Cost to Fix P1805

The cost of replacing a stop lamp switch can vary depending on the make and model of the vehicle. On average, the parts for a stop lamp switch replacement can range from $20 to $50. Labor costs can add an additional $50 to $100. Overall, the total repair cost is typically between $70 and $150. However, it is advisable to check with local auto repair shops for more accurate pricing, as rates may differ based on location and other factors. Remember that diagnosis time and labor rates can also impact the final cost.

Need more information about the P1805 code?

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Code P1805 Information for Specific Makes

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.

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