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P1805 2004 Infiniti G35 Code - Stop Lamp Switch

Quick Answer

The P1805 diagnostic trouble code (DTC) for a 2004 Infiniti G35 is related to the Stop Lamp Switch. Common causes include Faulty stop lamp switch, Wiring issues in the stop lamp switch circuit, Corrosion or damage to the switch contacts. 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 2004 Infiniti G35 indicates Stop Lamp Switch.
Common causes
Common causes include Faulty stop lamp switch, Wiring issues in the stop lamp switch circuit, Corrosion or damage to the switch contacts.
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 Aug 19, 2024
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Code P1805 2004 Infiniti G35 Description

The P1805 diagnostic trouble code (DTC) for a 2004 Infiniti G35 is related to the Stop Lamp Switch. This code indicates a malfunction in the stop lamp switch circuit. The stop lamp switch is a crucial component that detects when the brake pedal is pressed, sending a signal to the vehicle's brake lights to illuminate. When this switch malfunctions, it can lead to various issues with the vehicle's braking system, as well as affect other systems that rely on the brake switch signal.

OBDII Code P1805 2004 Infiniti G35 - Stop Lamp Switch
P1805 2004 Infiniti G35 Code - Stop Lamp Switch

Common Causes of P1805 2004 Infiniti G35

  1. Faulty stop lamp switch
  2. Wiring issues in the stop lamp switch circuit
  3. Corrosion or damage to the switch contacts
  4. Loose or disconnected electrical connectors
  5. Electronic control module (ECM) issues

Symptoms of P1805 2004 Infiniti G35

  1. Brake lights not working properly
  2. Cruise control not engaging/disengaging correctly
  3. Difficulty shifting out of park
  4. Check Engine Light illuminated
  5. ABS or traction control warning lights on

How to Fix P1805 2004 Infiniti G35

  1. Begin by locating the stop lamp switch, typically located near the top of the brake pedal assembly.
  2. Disconnect the electrical connector from the stop lamp switch.
  3. Remove the old stop lamp switch and replace it with a new one.
  4. Reconnect the electrical connector to the new stop lamp switch.
  5. Clear the DTC with a scan tool and test the brake lights to ensure they are functioning properly.

Cost to Fix P1805 2004 Infiniti G35

The cost to repair a stop lamp switch issue on a 2004 Infiniti G35 can vary depending on the specific cause of the problem and the labor rates in your area. On average, the parts for a stop lamp switch replacement can range from $30 to $80, while the labor cost can range from $50 to $100. Overall, the total repair cost for this issue could be between $80 and $180. Keep in mind that these are rough estimates and actual costs may vary. It's recommended to consult with a professional mechanic for a more accurate quote.

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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 2004 Infiniti G35 Code

1. What does the OBDII code P1805 indicate on a 2004 Infiniti G35?

The P1805 code indicates a malfunction with the stop lamp switch circuit, suggesting that there is an issue with the switch's electrical function or connection.

2. What are common symptoms of code P1805 in a 2004 Infiniti G35?

Common symptoms include the brake lights not functioning correctly, potential issues with shifting out of park (in automatic transmission models), and the illumination of the check engine light.

3. What could cause the P1805 code to appear on a 2004 Infiniti G35?

Potential causes include a faulty stop lamp switch, damaged wiring or connectors in the switch circuit, or a poor electrical connection.

4. How can I diagnose the P1805 code in my 2004 Infiniti G35?

Diagnosis involves checking the stop lamp switch operation, inspecting the wiring and connectors for damage or corrosion, and testing the electrical continuity in the stop lamp circuit with a multimeter.

5. What steps should be taken to fix the P1805 code on a 2004 Infiniti G35?

Repairing the P1805 code can involve replacing the stop lamp switch, repairing any damaged wires or connectors, and ensuring all connections are secure and corrosion-free.

6. Is it safe to drive a 2004 Infiniti G35 with the P1805 code?

While the vehicle may still be drivable, driving with malfunctioning brake lights is dangerous and illegal, as it can prevent other drivers from knowing when you are stopping.

7. After repairing the stop lamp switch, how do I clear the P1805 code on a 2004 Infiniti G35?

To clear the code, you can use an OBDII scanner to reset the vehicle's computer. It's also advisable to drive the vehicle to ensure the issue is fully resolved and the code does not reappear.

8. Could the P1805 code affect the performance of the transmission in a 2004 Infiniti G35?

Yes, a malfunctioning stop lamp switch can affect transmission performance, particularly in preventing the car from shifting out of park, as the system relies on the brake signal to release the shift lock.

9. What should I check first if I get a P1805 code on my 2004 Infiniti G35?

First, check the condition and operation of the stop lamp switch itself, as it is the most common culprit. Also, ensure that the brake lights activate when the brake pedal is pressed.

10. How much does it typically cost to fix a P1805 code in a 2004 Infiniti G35?

The cost to fix a P1805 can vary, but replacing a stop lamp switch is generally inexpensive. Including labor, the total cost can range from $50 to $150, depending on the rates of the service provider.

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