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P1078 Infiniti Code - Exhaust Valve Timing Control Position Sensor Bank 1 Circuit

Quick Answer

The P1078 code for Infiniti vehicles indicates a problem with the Exhaust Valve Timing Control Position Sensor in Bank 1. Common causes include Faulty Exhaust Valve Timing Control Position Sensor: The sensor itself may be faulty or damaged, causing inaccurate readings, Wiring Issues: Damaged or corroded wiring connections to the sensor can disrupt communication and trigger the P1078 code, Exhaust Valve Timing Control Solenoid Malfunction: A malfunction in the solenoid that controls the exhaust valve timing can also lead to this code. 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 Infiniti indicates Exhaust Valve Timing Control Position Sensor Bank 1 Circuit.
Common causes
Common causes include Faulty Exhaust Valve Timing Control Position Sensor: The sensor itself may be faulty or damaged, causing inaccurate readings, Wiring Issues: Damaged or corroded wiring connections to the sensor can disrupt communication and trigger the P1078 code, Exhaust Valve Timing Control Solenoid Malfunction: A malfunction in the solenoid that controls the exhaust valve timing can also lead to this code.
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 P1078 Infiniti Description

The P1078 code for Infiniti vehicles indicates a problem with the Exhaust Valve Timing Control Position Sensor in Bank 1. This sensor plays a crucial role in monitoring the position of the exhaust valve timing control solenoid, which is responsible for adjusting the timing of the exhaust valves in relation to the engine's operation. When the sensor detects an issue with the exhaust valve timing control position, it triggers the P1078 code to alert the vehicle's onboard computer system.

OBDII Code P1078 Infiniti - Exhaust Valve Timing Control Position Sensor Bank 1 Circuit
P1078 Infiniti Code - Exhaust Valve Timing Control Position Sensor Bank 1 Circuit

Common Causes of P1078 Infiniti

  1. Faulty Exhaust Valve Timing Control Position Sensor: The sensor itself may be faulty or damaged, causing inaccurate readings.
  2. Wiring Issues: Damaged or corroded wiring connections to the sensor can disrupt communication and trigger the P1078 code.
  3. Exhaust Valve Timing Control Solenoid Malfunction: A malfunction in the solenoid that controls the exhaust valve timing can also lead to this code.
  4. Engine Timing Chain/Belt Issues: Problems with the engine's timing chain or belt can affect the timing of the exhaust valves, triggering the P1078 code.

Symptoms of P1078 Infiniti

  1. Check Engine Light: The most common symptom associated with the P1078 code is the illumination of the check engine light on the vehicle's dashboard.
  2. Reduced Engine Performance: Drivers may notice a decrease in engine power or responsiveness, especially during acceleration.
  3. Rough Idling: The vehicle may experience rough idling or shaking while at a standstill.
  4. Increased Fuel Consumption: A malfunction in the exhaust valve timing control system can lead to poor fuel efficiency, causing higher fuel consumption.
  5. Engine Misfires: The engine may misfire or run unevenly, affecting overall performance.

How to Fix P1078 Infiniti

  1. Diagnose the Issue: Use a diagnostic scanner to retrieve the specific error codes and pinpoint the exact cause of the problem.
  2. Inspect Sensor and Wiring: Check the Exhaust Valve Timing Control Position Sensor for any signs of damage and inspect the wiring connections for faults.
  3. Replace Sensor/Solenoid: If the sensor or solenoid is found to be faulty, replace it with a new, compatible part.
  4. Clear Error Codes: After replacing the sensor/solenoid, clear the error codes from the vehicle's computer system to reset the check engine light.
  5. Test Drive: Take the vehicle for a test drive to ensure that the issue has been resolved and that the engine operates smoothly.

Cost to Fix P1078 Infiniti

The typical repair costs for addressing the P1078 code in an Infiniti vehicle can vary depending on the specific cause of the issue and the cost of parts and labor. On average, the repair costs for this type of problem can range from $200 to $500, including parts and labor. However, it is essential to note that diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It is recommended to check with local auto repair shops for a more accurate estimate based on your specific circumstances. Keep in mind that rates at dealerships or in metropolitan areas may be higher, while independent shops may offer more competitive pricing.

When is the Code Detected?

An excessively high or low voltage from the sensor is sent to Engine Control Module (ECM).

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Information for Specific Infiniti Models

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 Infiniti Code

No Frequently Asked Questions about P1078 Infiniti Code found.

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  • we checked the position sensor wire we get power and signal, and switched the position sensor and the solenoid from bank 2 but still the engine light on did u recommend me some thing

    Reply to Comment

    • If you’ve swapped the sensor and solenoid from Bank 2 to Bank 1 and the P1078 still comes back on Bank 1, that usually means the problem isn’t the sensor or the solenoid anymore. At that point you want to look at two things:

      1. The wiring on Bank 1 under load – even if you see power and signal with a meter, the signal wire may be breaking internally or losing continuity when the engine is vibrating. Try doing a wiggle test on the harness while watching the live data.

      2. Mechanical timing on that bank – if the timing chain guide or the cam phaser is starting to stick on Bank 1, the sensor will report the wrong cam position and the ECM thinks the sensor circuit is bad. This is pretty common on higher-mileage VQ engines.

      If the wiring checks out, you may need to verify cam timing or check the cam phaser operation with a scan tool. A mechanical issue on that cam is the most common cause when parts have already been swapped.

      Reply to Comment