AutoCodes – Generic – P1538

P1538 Code - Intake Manifold Runner Control Stuck Open Bank 2

Quick Answer

The Intake Manifold Runner Control (IMRC) is an electrically actuated system consisting of a motorized actuator with an attaching linkage for each housing on each bank. Common causes include Faulty Intake Manifold Runner Control (IMRC) actuator, Intake Manifold Runner Control actuator harness is open or shorted, Intake Manifold Runner Control 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: P1538 indicates Intake Manifold Runner Control Stuck Open Bank 2.
Common causes: Common causes include Faulty Intake Manifold Runner Control (IMRC) actuator, Intake Manifold Runner Control actuator harness is open or shorted, Intake Manifold Runner Control 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 31,999

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 Aug 03, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1538 Description

The Intake Manifold Runner Control (IMRC) is an electrically actuated system consisting of a motorized actuator with an attaching linkage for each housing on each bank. The linkage attaches to the housing butterfly plate levers. Each IMRC housing is an aluminum casting with two intake air passages for each cylinder. One passage is always open, and the other is opened and closed with a butterfly valve plate. The housing uses a return spring to hold the plates closed. The motorized actuator houses internal switches to provide feedback to the Powertrain Control Module (PCM), indicating linkage and plate position. Under about 3000 rpm, the vacuum solenoid will be energized. This will allow the manifold vacuum to be applied and the butterfly valve plates to stay closed. Above approximately 3000 rpm, the vacuum solenoid will be de-energized. This will allow a vacuum to vent from the actuator and the butterfly valve plates to open. The Diagnostic Trouble Code (DTC) sets when the IMRC is commanded close, but the IMRC monitor indicates open.

OBDII Code P1538 - Intake Manifold Runner Control Stuck Open Bank 2 - AutoCodes.com — P1538 Code - Intake Manifold Runner Control Stuck Open Bank 2

What does this mean?

What are the Possible Causes of the DTC P1538?

Faulty Intake Manifold Runner Control (IMRC) actuator
Intake Manifold Runner Control actuator harness is open or shorted
Intake Manifold Runner Control actuator circuit poor electrical connection
Faulty Powertrain Control Module (PCM)

How to Fix the DTC P1538?

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 P1538 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.

Need more information about the P1538 code?

Need more information on how to fix the P1538 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1538 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1538 Audi — Fuel Cut-off Valve Open/Short To Ground
P1538 Buick — A/C Request Circuit High Voltage
P1538 Cadillac — A/C Request Circuit High Voltage
P1538 Chevrolet — A/C Request Circuit High Voltage
P1538 Ford — Intake Manifold Runner Control Stuck Open Bank 2
P1538 GMC — A/C Request Circuit High Voltage
P1538 Land Rover — A/C Compressor Request High Input
P1538 Lincoln — Intake Manifold Runner Control Stuck Open Bank 2
P1538 Mazda — Intake Manifold Runner Control Stuck Open Bank 2
P1538 Mercury — Intake Manifold Runner Control Stuck Open Bank 2
P1538 Volkswagen — Fuel Cut-off Valve Open/Short To Ground

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 P1538 Code

1. What are common symptoms of OBDII code P1538, Intake Manifold Runner Control Stuck Open Bank 2?

- Common symptoms include rough idling, decreased engine performance, poor fuel efficiency, and the illumination of the check engine light.

2. What can cause the intake manifold runner control to get stuck open on Bank 2?

- Possible causes include a faulty intake manifold runner control actuator, carbon buildup in the intake manifold, vacuum leaks, or wiring issues.

3. How serious is the P1538 code, Intake Manifold Runner Control Stuck Open Bank 2?

- While the vehicle may still be operable with this issue, it can lead to reduced engine performance and fuel efficiency. It is recommended to address the problem promptly.

4. Can I drive with the P1538 code present?

- It is generally not recommended to drive with the P1538 code present, as it can lead to further damage to the engine and components. It is best to address the issue as soon as possible.

5. How can I diagnose the cause of the intake manifold runner control being stuck open on Bank 2?

- Diagnosing the issue may involve inspecting the intake manifold runner control actuator, checking for vacuum leaks, testing the wiring and connections, and cleaning the intake manifold of any carbon buildup.

6. What are some repair tips for fixing the Intake Manifold Runner Control Stuck Open Bank 2 code?

- Repair tips may include replacing the intake manifold runner control actuator, cleaning the intake manifold, fixing any vacuum leaks, checking and repairing wiring issues, and clearing the error code.

7. Can I reset the error code P1538 myself after fixing the issue?

- Yes, you can reset the error code using an OBDII scanner or by disconnecting the vehicle's battery for a few minutes. However, if the underlying issue is not fixed, the code may reappear.

8. How much does it typically cost to repair the P1538 code related to the intake manifold runner control stuck open on Bank 2?

- The cost of repair can vary depending on the root cause of the issue, the labor rates in your area, and whether you choose to fix it yourself or take it to a mechanic. It's best to get a diagnostic to determine the exact cost.

9. What is the purpose of the intake manifold runner control system, and how does it affect engine performance?

- The intake manifold runner control system helps optimize airflow to the engine for better performance and fuel efficiency by adjusting the length of the intake manifold runners. When stuck open, it can disrupt this process and lead to performance issues.

10. How can I prevent the intake manifold runner control from getting stuck open in the future?

- Regular maintenance, such as cleaning the intake manifold, checking for carbon buildup, and addressing any issues promptly, can help prevent the intake manifold runner control from getting stuck open in the future.