Engine-Codes.com
Engine-Codes – Generic – P1078

P1078 Code - Intake Manifold Runner Control System Malfunction High RPM

Quick Answer

The P1078 code indicates a malfunction in the Intake Manifold Runner Control (IMRC) system at high RPM. Common causes include Faulty IMRC actuator, Vacuum leaks in the IMRC system, Electrical issues with the IMRC solenoid. 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
P1078 indicates Intake Manifold Runner Control System Malfunction High RPM.
Common causes
Common causes include Faulty IMRC actuator, Vacuum leaks in the IMRC system, Electrical issues with the IMRC solenoid.
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 Sep 07, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P1078 Description

The P1078 code indicates a malfunction in the Intake Manifold Runner Control (IMRC) system at high RPM. The IMRC system is responsible for controlling the flow of air into the engine's intake manifold, optimizing performance and fuel efficiency. When the IMRC system malfunctions at high RPM, it can lead to a variety of issues that can affect the vehicle's performance and efficiency.

OBDII Code P1078 - Intake Manifold Runner Control System Malfunction High RPM
P1078 Code - Intake Manifold Runner Control System Malfunction High RPM

Common Causes of P1078

  1. Faulty IMRC actuator
  2. Vacuum leaks in the IMRC system
  3. Electrical issues with the IMRC solenoid
  4. Carbon build-up in the intake manifold runner
  5. Wiring or connector issues in the IMRC system

Symptoms of P1078

  1. Decreased engine performance at high RPM
  2. Engine hesitation or stumbling during acceleration
  3. Reduced fuel efficiency
  4. Illumination of the Check Engine Light
  5. Rough idling or engine misfires

How to Fix P1078

  1. Diagnose the root cause of the P1078 code using a scan tool to identify the specific issue with the IMRC system.
  2. Inspect the IMRC actuator, vacuum lines, solenoid, and intake manifold runner for any signs of damage or malfunction.
  3. Clean or replace any components that are faulty, such as the IMRC actuator or intake manifold runner.
  4. Clear the trouble codes and reset the vehicle's ECM to see if the issue has been resolved.
  5. Test drive the vehicle to ensure that the P1078 code does not reappear and that the vehicle's performance has been restored.

Cost to Fix P1078

The typical repair costs for addressing a P1078 code can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, the cost of parts for an IMRC system repair can range from $100 to $500, while labor costs can range from $150 to $400. Overall, the total cost for resolving a P1078 code can range from $250 to $900. It's important to note that these are rough estimates, and actual costs can vary based on factors such as the vehicle make and model, location, and the shop's labor rates. It's recommended to consult with a professional mechanic for a more accurate cost estimate for your specific situation.

Need more information about the P1078 code?

Need more information on how to fix the P1078 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1078 code diagnosed by a professional: Find a repair shop in your area

Code P1078 Information for Specific Makes

  • P1078 Acura — Intake Manifold Runner Control System Malfunction High RPM
  • P1078 BMW — VVT Overload Protection Control Motor Current High Input Bank 1
  • P1078 Honda — Intake Manifold Runner Control System Malfunction High RPM
  • P1078 Infiniti — Exhaust Valve Timing Control Position Sensor Bank 1 Circuit
  • P1078 MINI — VVT Overload Protection Control Motor Current High Input Bank 1
  • P1078 Nissan — Exhaust Valve Timing Control Position Sensor Bank 1 Circuit
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 P1078 Code

1. What are the common symptoms of OBDII code P1078?

- Common symptoms include rough idling, loss of power, poor acceleration, and the Check Engine Light illuminating.

2. What are the possible causes of the Intake Manifold Runner Control System Malfunction High RPM code?

- The code P1078 can be triggered by issues such as a faulty intake manifold runner control valve, a vacuum leak, a stuck intake manifold runner, or a problem with the wiring or connectors.

3. How can I diagnose the cause of OBDII code P1078?

- Diagnosis typically involves using a scan tool to read the code, inspecting the intake manifold runner control system components for damage or wear, and testing the operation of the control valve.

4. Can a dirty intake manifold cause code P1078 to appear?

- Yes, a dirty or clogged intake manifold can disrupt the proper functioning of the intake manifold runner control system, potentially triggering the P1078 code.

5. How can I repair OBDII code P1078 related to the Intake Manifold Runner Control System Malfunction High RPM?

- Repair options may include cleaning or replacing the intake manifold runner control valve, fixing any vacuum leaks, addressing wiring issues, or repairing or replacing the intake manifold runner if it's stuck.

6. Is it safe to continue driving with the P1078 code present?

- It is not recommended to ignore the P1078 code, as it can lead to poor engine performance and potentially cause further damage if left unresolved. It's best to address the issue as soon as possible.

7. Can a DIY enthusiast fix the Intake Manifold Runner Control System Malfunction High RPM issue?

- Depending on the root cause of the problem, some DIY enthusiasts may be able to tackle the repair themselves, especially if they have experience working on intake manifold components and access to the necessary tools.

8. Will resetting the Check Engine Light make the P1078 code disappear permanently?

- Simply resetting the Check Engine Light without addressing the underlying issue causing the P1078 code will not make it disappear permanently. The problem must be diagnosed and repaired to prevent the code from reappearing.

9. How can regular maintenance help prevent OBDII code P1078?

- Regular maintenance, such as keeping the intake system clean, inspecting for leaks, and replacing components at recommended intervals, can help prevent issues that may trigger the P1078 code.

10. Is it recommended to seek professional help for diagnosing and repairing code P1078?

- If you are unsure about diagnosing or repairing the P1078 code yourself, or if the issue seems complex, it is advisable to seek professional help from a qualified mechanic or automotive technician.

Discuss the causes and fixes for P1078 OBDII Code

Submit a New Comment

Code P1078 comments

No comments found for this page.