AutoCodes – Lexus – P2004 Lexus

P2004 Lexus Code - Intake Manifold Runner Control Stuck Open Bank 1

Quick Answer

The Tumble Control Valve (TCV) is built into the intake manifold. Common causes include Faulty Intake Air Control Valve Actuator (For Tumble Control Valve), Intake Air Control Valve Actuator harness is open or shorted, Intake Air Control Valve Actuator 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: P2004 Lexus indicates Intake Manifold Runner Control Stuck Open Bank 1.
Common causes: Common causes include Faulty Intake Air Control Valve Actuator (For Tumble Control Valve), Intake Air Control Valve Actuator harness is open or shorted, Intake Air Control Valve Actuator 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 10,733

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 Sep 15, 2022

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2004 Lexus Description

The Tumble Control Valve (TCV) is built into the intake manifold. The Intake Air Control Valve Actuator (For Tumble Control Valve) is composed of a position sensor and a DC motor. The DC motor opens and closes the tumble control valve in response to signals from the Engine Control Module (ECM). The position sensor detects the opening angle of the tumble control valve.
When the tumble control valve is closed, the intake air tumble flow intensifies, and negative pressure is generated between the tumble control valve and intake valve which atomizes the fuel. Combustion is enhanced and exhaust gas emissions are reduced at low temperatures.
When the ECM has requested a tumble control valve close operation but the actual tumble control valve opening angle is 17 deg. or more for 10 seconds, Diagnostic Trouble Code (DTC) P2004 is stored.

OBDII Code P2004 Lexus - Intake Manifold Runner Control Stuck Open Bank 1 - AutoCodes.com — P2004 Lexus Code - Intake Manifold Runner Control Stuck Open Bank 1

What does this mean?

What are the Possible Causes of the DTC P2004 Lexus?

Faulty Intake Air Control Valve Actuator (For Tumble Control Valve)
Intake Air Control Valve Actuator harness is open or shorted
Intake Air Control Valve Actuator circuit poor electrical connection
Faulty Intake manifold
Faulty Engine Control Module (ECM)

How to Fix the DTC P2004 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 P2004 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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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 P2004 Lexus Code

1. What does the OBDII code P2004 mean on a Lexus?

P2004 indicates that the Intake Manifold Runner Control (IMRC) is stuck open on Bank 1, which can affect engine performance and fuel efficiency.

2. What are the symptoms of a P2004 code on a Lexus?

Common symptoms include reduced engine power, poor fuel economy, rough idling, and an illuminated check engine light.

3. What causes the P2004 code on a Lexus?

Possible causes include a faulty IMRC actuator, carbon buildup in the intake manifold, a damaged IMRC valve, or wiring and connector issues.

4. Can I drive my Lexus with a P2004 code?

While you can drive with this code, itâ€™s not recommended, as it may lead to reduced performance, further damage, or increased emissions.

5. How do I diagnose a P2004 code on a Lexus?

Diagnosis typically involves inspecting the IMRC actuator, checking for carbon buildup, testing the wiring and connectors, and using a scan tool to monitor IMRC operation.

6. How can I fix the P2004 code on my Lexus?

Repairs may include cleaning the intake manifold, replacing the IMRC actuator or valve, and repairing or replacing damaged wiring or connectors.

7. How much does it cost to fix a P2004 code on a Lexus?

Repair costs vary but can range from $100 to $600 depending on whether cleaning, part replacement, or professional labor is required.

8. Does a P2004 code affect emissions testing on a Lexus?

Yes, a P2004 code can cause your Lexus to fail emissions testing due to improper intake manifold operation.

9. Can a dirty air filter trigger a P2004 code on a Lexus?

A dirty air filter is unlikely to directly trigger P2004, but it can contribute to intake airflow issues over time, exacerbating the problem.

10. Will clearing the check engine light fix the P2004 code on my Lexus?

Clearing the code with a scan tool will turn off the check engine light temporarily, but the code will return unless the underlying issue is resolved.