AutoCodes – Infiniti – P1805 2004 Infiniti G35

P1805 2004 Infiniti G35 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 2004 Infiniti G35 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 3,877

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 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 2004 Infiniti G35 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 2004 Infiniti G35 - Stop Lamp Switch - AutoCodes.com — P1805 2004 Infiniti G35 Code - Stop Lamp Switch

What does this mean?

What are the Possible Causes of the DTC P1805 2004 Infiniti G35?

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 2004 Infiniti G35?

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 2004 Infiniti G35 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.

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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.