AutoCodes – Lexus – P1604 Lexus

P1604 Lexus Code - Startability Malfunction

Quick Answer

The P1604 code is stored if the engine does not start or when the engine takes a long time to start, and when the engine speed is low or the engine stalls just after the engine starts. Common causes include Low Battery charge, Starting system, Low quality fuel. 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: P1604 Lexus indicates Startability Malfunction.
Common causes: Common causes include Low Battery charge, Starting system, Low quality fuel.
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 50,359

How popular is this code, among other codes? Medium

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 Sep 06, 2022

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1604 Lexus Description

The P1604 code is stored if the engine does not start or when the engine takes a long time to start, and when the engine speed is low or the engine stalls just after the engine starts. The P1604 code is also stored if the vehicle has run out of fuel. It is necessary to check whether there was enough fuel in the fuel tank before performing this inspection.

OBDII Code P1604 Lexus - Startability Malfunction - AutoCodes.com — P1604 Lexus Code - Startability Malfunction

What does this mean?

What are the Possible Causes of the DTC P1604 Lexus?

Low Battery charge
Starting system
Low quality fuel
Clogged Fuel filter
Faulty Engine Control Module (ECM)

How to Fix the DTC P1604 Lexus?

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 P1604 Lexus 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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Need more information on how to fix the P1604 Lexus code? Get Access to Factory Service Manuals

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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 P1604 Lexus Code

1. What are the common symptoms of OBDII code P1604 in a Lexus related to Startability Malfunction?

The common symptoms include difficulty starting the vehicle, intermittent stalling, and potential reduction in engine performance.

2. What are the possible causes of OBDII code P1604 related to Startability Malfunction in a Lexus?

The code P1604 in a Lexus indicating Startability Malfunction can be caused by issues with the engine control module (ECM), faulty wiring connections, or a malfunctioning immobilizer system.

3. How can I diagnose the OBDII code P1604 in a Lexus related to Startability Malfunction?

Diagnosing the code P1604 involves using an OBDII scanner to retrieve the trouble codes, checking the wiring connections for any damage, and testing the ECM and immobilizer system for proper functionality.

4. Can a DIY enthusiast repair OBDII code P1604 in a Lexus related to Startability Malfunction?

While basic troubleshooting steps like checking wiring connections can be done by a DIY enthusiast, repairing the root cause of the code P1604 may require specialized tools and expertise, making it advisable to consult a professional mechanic.

5. How can I reset the OBDII code P1604 in a Lexus related to Startability Malfunction?

Resetting the code P1604 can be done using an OBDII scanner to clear the trouble codes after addressing the underlying issue causing the Startability Malfunction.

6. What are the potential risks of ignoring OBDII code P1604 in a Lexus related to Startability Malfunction?

Ignoring the code P1604 can lead to prolonged starting issues, potential stalling while driving, and increased risk of engine damage, highlighting the importance of timely diagnosis and repair.

7. Is it safe to drive my Lexus with OBDII code P1604 related to Startability Malfunction?

It is not recommended to drive your Lexus with the code P1604, as it can lead to unpredictable engine behavior and potential safety hazards. It's best to address the issue promptly.

8. Are there any preventive maintenance tips to avoid OBDII code P1604 related to Startability Malfunction in a Lexus?

Regularly inspecting and maintaining the wiring connections, ensuring proper immobilizer system function, and promptly addressing any starting issues can help prevent the occurrence of the code P1604 in a Lexus.

9. Can extreme weather conditions trigger OBDII code P1604 related to Startability Malfunction in a Lexus?

Extreme weather conditions can exacerbate existing issues that may trigger the code P1604, such as electrical connection problems or immobilizer malfunctions, making it important to maintain your vehicle accordingly.

10. How long does it typically take to repair OBDII code P1604 related to Startability Malfunction in a Lexus?

The repair time for the code P1604 can vary depending on the specific cause, but it may range from a few hours to a day, especially if diagnostics and parts replacement are involved.