AutoCodes – Generic – P2078

P2078 Code - Intake Manifold Tuning Valve Position Sensor/Switch Circuit High Bank 1

Quick Answer

The Intake Manifold Tuning Valve (IMTV) is a motorized actuated unit mounted directly to the intake manifold. Common causes include Faulty Intake Manifold Tuning Valve Position Sensor/Switch, Intake Manifold Tuning Valve Position Sensor/Switch harness is open or shorted, Intake Manifold Tuning Valve Position Sensor/Switch 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 indicates Intake Manifold Tuning Valve Position Sensor/Switch Circuit High Bank 1.
Common causes: Common causes include Faulty Intake Manifold Tuning Valve Position Sensor/Switch, Intake Manifold Tuning Valve Position Sensor/Switch harness is open or shorted, Intake Manifold Tuning Valve Position Sensor/Switch 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 31,372

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 Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P2078 Description

The Intake Manifold Tuning Valve (IMTV) is a motorized actuated unit mounted directly to the intake manifold. The IMTV actuator controls a shutter device attached to the actuator shaft. There is no monitor input to the Powertrain Control Module (PCM) with this system to indicate shutter position.
The motorized IMTV unit will not be energized below approximately 2600 rpm or higher on some vehicles. The shutter will be in the closed position not allowing airflow blend to occur in the intake manifold. Above approximately 2600 rpm or higher, the motorized unit will be energized. The motorized unit will be commanded on by the PCM initially at a 100 percent duty cycle to move the shutter to the open position and then falling to approximately 50 percent to continue to hold the shutter open.
The Intake Manifold Tuning Valve (IMTV) system is monitored for failure during continuous, Key ON Engine OFF (KOEO), or Key ON Engine Running (KOER) self-tests. The test fails when the signal is more or less than an expected calibrated range.

OBDII Code P2078 - Intake Manifold Tuning Valve Position Sensor/Switch Circuit High Bank 1 - AutoCodes.com — P2078 Code - Intake Manifold Tuning Valve Position Sensor/Switch Circuit High Bank 1

What does this mean?

What are the Possible Causes of the DTC P2078?

Faulty Intake Manifold Tuning Valve Position Sensor/Switch
Intake Manifold Tuning Valve Position Sensor/Switch harness is open or shorted
Intake Manifold Tuning Valve Position Sensor/Switch circuit poor electrical connection
Faulty Intake Manifold Tuning Valve (IMTV)
Faulty Intake Manifold Runner Control (IMRC)
Faulty Powertrain Control Module (PCM)

How to Fix the DTC P2078?

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 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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Information for Specific Makes

P2078 Buick — Intake Manifold Tuning Valve Position Sensor Circuit High Voltage
P2078 Cadillac — Intake Manifold Tuning Valve Position Sensor Circuit High Voltage
P2078 Chevrolet — Intake Manifold Tuning Valve Position Sensor Circuit High Voltage
P2078 Chrysler — Intake Manifold Tuning Valve Position Sensor/Switch Circuit High Bank 1
P2078 Dodge — Intake Manifold Tuning Valve Position Sensor/Switch Circuit High Bank 1
P2078 Ford — Intake Manifold Tuning Valve Position Sensor/Switch Circuit High Bank 1
P2078 GMC — Intake Manifold Tuning Valve Position Sensor Circuit High Voltage
P2078 Jeep — Intake Manifold Tuning Valve Position Sensor/Switch Circuit High Bank 1
P2078 Lincoln — Intake Manifold Tuning Valve Position Sensor/Switch Circuit High Bank 1
P2078 Mercury — Intake Manifold Tuning Valve Position Sensor/Switch Circuit High Bank 1

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.