AutoCodes – Generic – P1055

P1055 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 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 17,175

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

What does this mean?

What are the Possible Causes of the DTC P1055?

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?

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 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.

Need more information about the P1055 code?

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Need Help with the Code?

Get the P1055 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1055 Audi — Bank 1 Camshaft Adjustment Short To B+
P1055 BMW — Valvetronic Supply Voltage Control Motor High Input
P1055 Dodge — Idle RPM Low
P1055 MINI — Valvetronic Supply Voltage Control Motor High Input
P1055 Volkswagen — Bank 1 Camshaft Adjustment Short To B+

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 Code

1. What are the common symptoms of OBDII code P1055 (Valvetronic Supply Voltage Control Motor High Input)?

- Common symptoms include rough idling, loss of power, decreased fuel efficiency, and the vehicle going into limp mode.

2. What can cause OBDII code P1055 to trigger?

- This code is typically triggered by issues with the valvetronic supply voltage control motor, such as a faulty motor, damaged wiring, or a poor electrical connection.

3. How serious is OBDII code P1055?

- While the severity can vary, it is important to address this code promptly to prevent further damage to the engine and to ensure optimal vehicle performance.

4. How can I diagnose the cause of OBDII code P1055?

- Diagnosing this code usually involves inspecting the valvetronic supply voltage control motor, checking for wiring issues, and using a diagnostic scanner to gather more information about the problem.

5. Can I continue driving with OBDII code P1055 present?

- It is not recommended to continue driving with this code present, as it can lead to more severe issues over time and may result in further damage to the vehicle.

6. How can OBDII code P1055 be repaired?

- Repairing this code often involves replacing the valvetronic supply voltage control motor, repairing any damaged wiring, and clearing the code with a diagnostic scanner.

7. Is it possible to prevent OBDII code P1055 from occurring?

- Regular maintenance and inspections of the valvetronic system can help prevent this code from occurring. Ensuring proper electrical connections and addressing any issues promptly can also help prevent this code.

8. Can a DIY enthusiast repair OBDII code P1055 at home?

- While some DIY enthusiasts may be able to replace the valvetronic supply voltage control motor or address wiring issues, it is recommended to consult a professional mechanic for an accurate diagnosis and repair.

9. How much does it typically cost to repair OBDII code P1055?

- The cost of repairing this code can vary depending on the extent of the issue, the cost of parts, and labor rates. It is advisable to obtain quotes from multiple mechanics to compare prices.

10. Will OBDII code P1055 cause my vehicle to fail an emissions test?

- Yes, this code can cause a vehicle to fail an emissions test, as it indicates a problem with the valvetronic system, which can impact emissions output. Addressing this code promptly is crucial for passing emissions tests.