AutoCodes – BMW – P1078 BMW

P1078 BMW Code - VVT Overload Protection Control Motor Current High Input Bank 1

Quick Answer

On the Valvetronic VVT (Variable Valve Lift Control), the variable valve gear reduces fuel consumption by adjusting the stroke of the intake valves. Common causes include Faulty Variable Valve Timing (VVT) Servo Motor, Variable Valve Timing Servo Motor harness is open or shorted, Variable Valve Timing Servo Motor 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: P1078 BMW indicates VVT Overload Protection Control Motor Current High Input Bank 1.
Common causes: Common causes include Faulty Variable Valve Timing (VVT) Servo Motor, Variable Valve Timing Servo Motor harness is open or shorted, Variable Valve Timing Servo Motor 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 5,267

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 Aug 11, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1078 BMW Description

On the Valvetronic VVT (Variable Valve Lift Control), the variable valve gear reduces fuel consumption by adjusting the stroke of the intake valves. An electric motor is used to drive a worm gear that moves the eccentric shaft. The eccentric shaft uses intermediate levers that change the effect of the camshaft on the rocker arms. Monitoring of servo motor overload; The VVT servo motor temperature is calculated in the Digital Motor Electronics (DME) using a model. The first stage occurs when it heats beyond a warning threshold. This is 190°C (VVT motor temperature) and causes the VVT to revert to operation in its emergency mode. If the VVT motor were to overheat even further, the VVT system would be completely deactivated upon reaching the deactivation threshold (200°C VVT motor temperature).

OBDII Code P1078 BMW - VVT Overload Protection Control Motor Current High Input Bank 1 - AutoCodes.com — P1078 BMW Code - VVT Overload Protection Control Motor Current High Input Bank 1

What does this mean?

What are the Possible Causes of the DTC P1078 BMW?

Faulty Variable Valve Timing (VVT) Servo Motor
Variable Valve Timing Servo Motor harness is open or shorted
Variable Valve Timing Servo Motor circuit poor electrical connection

How to Fix the DTC P1078 BMW?

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 P1078 BMW 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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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 BMW Code

1. What are common symptoms of OBDII code P1078 on a BMW related to the VVT Overload Protection Control Motor Current High Input Bank 1?

Symptoms may include engine misfires, rough idling, loss of power, and the illumination of the Check Engine Light.

2. What are the potential causes of OBDII code P1078 on a BMW?

Possible causes include a faulty VVT control motor, wiring issues, a malfunctioning VVT solenoid, or problems with the engine control module.

3. How can I diagnose the issue causing OBDII code P1078 on my BMW?

Diagnosis typically involves using an OBDII scanner to read the code, checking the VVT components for proper operation, inspecting the wiring for damage, and performing tests to identify the root cause.

4. Can I continue driving my BMW with OBDII code P1078 present?

It is not recommended to continue driving with this code active, as it can lead to further engine damage and reduced performance. It's best to address the issue promptly.

5. How can I repair OBDII code P1078 on a BMW myself?

DIY repairs may involve replacing the VVT control motor or solenoid, repairing any damaged wiring, and clearing the code with an OBDII scanner. However, professional help is advisable for accurate diagnosis and repair.

6. Is it safe to clear the OBDII code P1078 on my BMW without fixing the underlying issue?

Clearing the code without addressing the root cause will only temporarily turn off the Check Engine Light. The issue will likely persist and may lead to more serious problems down the line.

7. How much does it typically cost to repair OBDII code P1078 on a BMW at a repair shop?

The cost of repair can vary depending on the specific issue, parts needed, and labor rates. It's recommended to obtain quotes from different shops for an accurate estimate.

8. Can a VVT Overload Protection Control Motor Current High Input Bank 1 issue impact the overall performance of my BMW?

Yes, this issue can affect the engine's performance, fuel efficiency, and emissions. It is important to address it promptly to maintain the vehicle's optimal operation.

9. Are there any preventive maintenance tips to avoid OBDII code P1078 on a BMW?

Regularly servicing your vehicle, using high-quality oil, and addressing any engine issues promptly can help prevent VVT-related problems that may trigger this OBDII code.

10. How long does it typically take to repair OBDII code P1078 on a BMW?

The repair duration can vary based on the extent of the issue and the availability of parts. Some repairs may be completed in a few hours, while more complex cases may take longer to diagnose and fix.