AutoCodes – BMW – P1055 BMW

P1055 BMW Code - Valvetronic Supply Voltage Control Motor High Input

Quick Answer

The Valvetronic (VVT) System is a Variable Valve Lift (VVL) system that, in combination with variable valve timing, allows infinite adjustment of the intake valve timing and duration. Common causes include Faulty Valvetronic Control Motor, Valvetronic Control Motor harness is open or shorted, Valvetronic Control 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: P1055 BMW indicates Valvetronic Supply Voltage Control Motor High Input.
Common causes: Common causes include Faulty Valvetronic Control Motor, Valvetronic Control Motor harness is open or shorted, Valvetronic Control 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 19,109

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 Jul 17, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1055 BMW Description

The Valvetronic (VVT) System is a Variable Valve Lift (VVL) system that, in combination with variable valve timing, allows infinite adjustment of the intake valve timing and duration. The system helps improve fuel economy and emissions and negates the need for a throttle body in regular use. The electronic control of the Valvetronic is dependent on, Voltage Limits, Adaptations, current and power stage temperature. The monitoring function performs an electrical diagnosis Of the DC motor lines. The goal of this function is to detect a short circuit at the VVL output stage. The function uses temperatures from the sensor outputs of the power stage. If the temperature of one power stage is greater than a threshold the function checks the output stage. If a short circuit is detected an error is set.

OBDII Code P1055 BMW - Valvetronic Supply Voltage Control Motor High Input - AutoCodes.com — P1055 BMW Code - Valvetronic Supply Voltage Control Motor High Input

What does this mean?

What are the Possible Causes of the DTC P1055 BMW?

Faulty Valvetronic Control Motor
Valvetronic Control Motor harness is open or shorted
Valvetronic Control Motor circuit poor electrical connection

How to Fix the DTC P1055 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 P1055 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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Need Help with the Code?

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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 P1055 BMW Code

1. What are the common symptoms of OBDII code P1055 in a BMW related to the Valvetronic Supply Voltage Control Motor High Input?

The common symptoms include rough idling, loss of power or acceleration, engine misfires, and possible stalling.

2. What are the potential causes of OBDII code P1055 in a BMW?

The code P1055 typically indicates a problem with the Valvetronic supply voltage control motor circuit, which could be caused by a faulty control motor, wiring issues, or a malfunctioning engine control module (ECM).

3. How can I diagnose the cause of OBDII code P1055 in my BMW?

A thorough diagnostic procedure involves checking the wiring harness for any damage, testing the Valvetronic supply voltage control motor, and verifying the signals between the motor and the ECM using a multimeter or a BMW diagnostic tool.

4. Is it safe to continue driving my BMW with OBDII code P1055 present?

It is not recommended to drive your BMW with the code P1055 active, as it can lead to further engine damage or unsafe driving conditions due to potential power loss or stalling.

5. Can I reset OBDII code P1055 in my BMW without fixing the underlying issue?

While you can clear the code using an OBDII scanner, it is essential to address the root cause of the problem to prevent the code from reappearing and ensure your BMW operates correctly.

6. What are the repair options for fixing OBDII code P1055 in a BMW?

Repair options may include replacing the Valvetronic supply voltage control motor, repairing damaged wiring, or reprogramming the ECM if necessary. Consult a qualified mechanic or BMW specialist for proper diagnosis and repair.

7. How much does it cost to repair OBDII code P1055 in a BMW?

The cost of repairing OBDII code P1055 can vary depending on the extent of the issue, parts needed for replacement, and labor charges. It is advisable to obtain quotes from different repair shops for comparison.

8. Are there any preventive measures to avoid OBDII code P1055 in a BMW?

Regular maintenance, such as checking and replacing worn-out components, inspecting wiring harnesses for damage, and following BMW's recommended service intervals, can help prevent issues leading to OBDII code P1055.

9. Can a DIY enthusiast address OBDII code P1055 in a BMW?

While some simple tasks like checking fuses or visual inspection of wiring can be done by a DIY enthusiast, diagnosing and repairing complex issues related to OBDII code P1055 may require specialized knowledge and tools best handled by a qualified mechanic.

10. How long does it take to repair OBDII code P1055 in a BMW?

The repair time for OBDII code P1055 can vary based on the specific cause of the issue and the expertise of the mechanic. It may range from a few hours to a full day, depending on the complexity of the repair needed.