AutoCodes – Generic – P1056

P1056 Code - Valvetronic Supply Voltage Control Motor Low 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: P1056 indicates Valvetronic Supply Voltage Control Motor Low 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 16,035

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 P1056 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 P1056 - Valvetronic Supply Voltage Control Motor Low Input - AutoCodes.com — P1056 Code - Valvetronic Supply Voltage Control Motor Low Input

What does this mean?

What are the Possible Causes of the DTC P1056?

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

How to Fix the DTC P1056?

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 P1056 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?

Get the P1056 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1056 Audi — Bank 1 Camshaft Adjustment Short To Ground
P1056 BMW — Valvetronic Supply Voltage Control Motor Low Input
P1056 Buick — Reductant Pump Low Speed
P1056 Cadillac — Reductant Pump Low Speed
P1056 Chevrolet — Reductant Pump Low Speed
P1056 Dodge — Reductant Pump Low Speed
P1056 GMC — Reductant Pump Low Speed
P1056 MINI — Valvetronic Supply Voltage Control Motor Low Input
P1056 Volkswagen — Bank 1 Camshaft Adjustment Short To Ground

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 P1056 Code

1. What are common symptoms of OBDII code P1056 (Valvetronic Supply Voltage Control Motor Low Input)?

The common symptoms of OBDII code P1056 include rough idling, loss of power, engine stalling, and the Check Engine light illuminating on the dashboard.

2. What are possible causes of OBDII code P1056?

Possible causes of OBDII code P1056 include a faulty valvetronic motor, damaged wiring or connectors in the valvetronic system, low engine oil level, or a failing engine control module.

3. How can I diagnose OBDII code P1056?

Diagnosing OBDII code P1056 typically involves using a scan tool to read the code and perform a thorough inspection of the valvetronic system components, such as the motor, wiring, and connectors. Checking the engine oil level is also important.

4. Can I continue driving with OBDII code P1056?

It is not recommended to drive with OBDII code P1056 present, as it can lead to further engine damage and potentially unsafe driving conditions. It is best to address the issue promptly.

5. How can I repair OBDII code P1056?

Repairing OBDII code P1056 may involve replacing the faulty valvetronic motor, repairing or replacing damaged wiring or connectors, ensuring the engine oil level is correct, or reprogramming the engine control module.

6. Can a DIY enthusiast fix OBDII code P1056 at home?

While some DIY enthusiasts may be able to diagnose and address simple causes of OBDII code P1056, it is recommended to seek professional help for more complex issues to ensure proper repair and avoid further damage.

7. How much does it cost to repair OBDII code P1056?

The cost to repair OBDII code P1056 can vary depending on the underlying cause, the extent of the repair needed, and the labor rates of the repair shop. It is advisable to obtain multiple quotes for an accurate estimate.

8. What preventive maintenance can help prevent OBDII code P1056?

Regularly checking and maintaining the engine oil level, as well as ensuring the valvetronic system components are in good condition, can help prevent OBDII code P1056 from occurring.

9. Is OBDII code P1056 a serious issue?

OBDII code P1056 should be addressed promptly to prevent potential engine damage and unsafe driving conditions. Ignoring the code can lead to more severe issues over time.

10. Can resetting the Check Engine light resolve OBDII code P1056?

Resetting the Check Engine light may temporarily turn it off, but it will not fix the underlying issue causing OBDII code P1056. It is important to diagnose and repair the problem to prevent it from reoccurring.