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AutoCodes – Chevrolet – P2078 Chevrolet

P2078 Chevrolet Code - Intake Manifold Tuning Valve Position Sensor Circuit High Voltage

Quick Answer

An Intake Manifold Tuning (IMT) Valve is used to change the intake manifold plenum configuration. Common causes include Faulty Intake Manifold Tuning Valve, Intake Manifold Tuning Valve harness is open or shorted, Intake Manifold Tuning Valve 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
P2078 Chevrolet indicates Intake Manifold Tuning Valve Position Sensor Circuit High Voltage.
Common causes
Common causes include Faulty Intake Manifold Tuning Valve, Intake Manifold Tuning Valve harness is open or shorted, Intake Manifold Tuning Valve 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 3,333
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Nov 13, 2020
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Code P2078 Chevrolet Description

An Intake Manifold Tuning (IMT) Valve is used to change the intake manifold plenum configuration. When the IMT valve is open, the intake manifold is configured to one large plenum. When the IMT valve is closed, the intake manifold is configured to 2 smaller plenums. The IMT valve improves engine performance at low and high engine speeds depending on the engine load. The Diagnostic Trouble Code (DTC) will set when the control module detects that the state of the driver and the state of the circuit do not match. The control module will detect an open, short to ground on the variable tuning valve signal or an open or a short to ground on the ignition voltage circuit of the IMT valve solenoid for more than 6.25 seconds.
OBDII Code P2078 Chevrolet - Intake Manifold Tuning Valve Position Sensor Circuit High Voltage - AutoCodes.com
P2078 Chevrolet Code - Intake Manifold Tuning Valve Position Sensor Circuit High Voltage
What does this mean?

What are the Possible Causes of the DTC P2078 Chevrolet?

  • Faulty Intake Manifold Tuning Valve
  • Intake Manifold Tuning Valve harness is open or shorted
  • Intake Manifold Tuning Valve circuit poor electrical connection

How to Fix the DTC P2078 Chevrolet?

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 P2078 Chevrolet 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 P2078 Chevrolet code?

Need more information on how to fix the P2078 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P2078 Chevrolet code diagnosed by a professional: Find a repair shop in your area

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 P2078 Chevrolet Code

1. What does the OBDII code P2078 mean on a Chevrolet?

P2078 indicates a problem with the Intake Manifold Tuning Valve Position Sensor Circuit, specifically a high voltage reading detected by the engine control module (ECM).

2. What are the symptoms of code P2078 in a Chevrolet?

Common symptoms include reduced engine performance, poor fuel economy, rough idling, and an illuminated Check Engine Light.

3. What causes the P2078 code in a Chevrolet?

Potential causes include a faulty intake manifold tuning valve, damaged wiring or connectors, a failed position sensor, or issues with the ECM.

4. Can I drive my Chevrolet with the P2078 code?

While it may be possible to drive, it is not recommended as it can lead to reduced performance and potential long-term engine damage if not addressed.

5. How do I diagnose the P2078 code on a Chevrolet?

Start by inspecting the wiring and connectors for damage, then test the intake manifold tuning valve and position sensor for proper operation. A scan tool can help monitor sensor readings.

6. How do I fix the P2078 code in a Chevrolet?

Repairs may include replacing the intake manifold tuning valve, repairing or replacing damaged wiring, or replacing the position sensor if it's faulty.

7. Can a dirty intake manifold cause the P2078 code?

Yes, a buildup of carbon deposits in the intake manifold can cause the tuning valve to stick, leading to the high voltage reading.

8. How much does it cost to fix the P2078 code on a Chevrolet?

Repair costs vary but can range from $100 to $500, depending on whether the issue is with the sensor, valve, or wiring.

9. Will clearing the P2078 code fix the problem?

Clearing the code will not fix the underlying issue. The problem must be diagnosed and repaired to prevent the code from returning.

10. Is the P2078 code common in Chevrolet vehicles?

This code is not extremely common but can occur, particularly in higher-mileage vehicles or those with intake system issues.

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