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Engine-Codes – Generic – P2078

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

Quick Answer

The P2078 diagnostic trouble code (DTC) refers to the Intake Manifold Tuning Valve Position Sensor/Switch Circuit High Bank 1. Common causes include Faulty intake manifold tuning valve position sensor/switch, Wiring harness issues, ECM communication problems. 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, Wiring harness issues, ECM communication problems.
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 08, 2024
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Code P2078 Description

The P2078 diagnostic trouble code (DTC) refers to the Intake Manifold Tuning Valve Position Sensor/Switch Circuit High Bank 1. This code indicates that there is a high voltage condition in the circuit related to the intake manifold tuning valve position sensor or switch in bank 1 of the engine. The intake manifold tuning valve is responsible for controlling the flow of air into the engine's intake manifold, optimizing performance and efficiency based on driving conditions.

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

Common Causes of P2078

  1. Faulty intake manifold tuning valve position sensor/switch
  2. Wiring harness issues
  3. ECM communication problems
  4. Vacuum leaks in the intake manifold
  5. Carbon buildup in the intake manifold

Symptoms of P2078

  1. Rough idling
  2. Decreased acceleration
  3. Reduced fuel efficiency
  4. Engine stalling
  5. Check Engine Light illuminated

How to Fix P2078

  1. Use a scan tool to diagnose the P2078 code and confirm the issue with the intake manifold tuning valve position sensor/switch.
  2. Inspect the wiring harness for any damage or loose connections. Repair or replace as necessary.
  3. Check for vacuum leaks in the intake manifold and repair them.
  4. Clean the intake manifold to remove any carbon buildup that may be affecting sensor operation.
  5. If necessary, replace the intake manifold tuning valve position sensor/switch.

Cost to Fix P2078

The typical repair costs for addressing the P2078 code can vary depending on the specific cause of the issue and the vehicle's make and model. However, on average, the repair for this code can range from $200 to $500, including parts and labor. It's important to note that diagnostic time and labor rates can vary between auto repair shops, so it's advisable to check with local shops for a more accurate estimate. Keep in mind that rates may be higher at dealerships or in metropolitan areas, while independent shops may offer more competitive pricing.

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Code P2078 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.

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