P2078 Fault Code

Intake Manifold Tuning (IMT) Valve Position Sensor/Switch Circuit High Bank 1a

• What does that mean?
• Symptoms
• Causes
• Solutions

The P2078 fault code indicates that the Intake Manifold Tuning (IMT) Valve Position Sensor or Switch Circuit has detected a high voltage condition in Bank 1a. This issue can affect engine performance and fuel efficiency, as the IMT helps control the airflow into the engine by adjusting the position of the intake manifold tuning valve.

What are the symptoms of the P2078 code?

Symptoms associated with a P2078 code may include:

• Check Engine Light illuminated on the dashboard
• Decreased engine performance and acceleration
• Rough idle or stalling
• Increased fuel consumption
• Noticeable decrease in power during acceleration.

What causes the P2078 code?

Common causes of the P2078 code include:

• Faulty IMT valve position sensor or switch
• Wiring issues such as shorts or breaks in the circuit
• Corroded or loose electrical connections
• Malfunctioning engine control module (ECM)
• Blocked or malfunctioning intake manifold components.

How to fix P2078?

To resolve the P2078 fault code, follow these steps:

1. Inspect the IMT valve position sensor and wiring for signs of damage or corrosion.
2. Ensure all electrical connections are secure and free of contaminants.
3. Test the IMT valve position sensor for proper operation and replace if faulty.
4. Check the intake manifold for blockages or issues affecting the tuning valve’s function.
5. Finally, clear the fault codes and test drive the vehicle to see if the issue is resolved.