AutoCodes – BMW – P1020 BMW

P1020 BMW Code - Valvetronic Eccentric Shaft Sensor Power Supply Low

Quick Answer

The Valvetronic System is a variable valve lift system that, in combination with variable valve timing, allows infinite adjustment of the intake valve timing and duration. Common causes include Reluctor on Valvetronic Eccentric Shaft Sensor poor installation, Faulty Valvetronic Eccentric Shaft Sensor, Valvetronic Eccentric Shaft Sensor harness is open or shorted. 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: P1020 BMW indicates Valvetronic Eccentric Shaft Sensor Power Supply Low.
Common causes: Common causes include Reluctor on Valvetronic Eccentric Shaft Sensor poor installation, Faulty Valvetronic Eccentric Shaft Sensor, Valvetronic Eccentric Shaft Sensor harness is open or shorted.
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 18,871

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 P1020 BMW Description

The Valvetronic System is a variable valve lift 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 Eccentric Shaft Position Sensor is used as feedback for the Valvetronic Eccentric Shaft. The Valvetronic Eccentric Shaft is actuated by Valvetronic Motor and in return controls the variable intake valve lift. The Eccentric Shaft Sensor is mounted to the cylinder head beneath the valve cover. The Diagnostic Trouble Code (DTC) will be set if the Valvetronic Eccentric Shaft Sensor is not to factory specifications.

OBDII Code P1020 BMW - Valvetronic Eccentric Shaft Sensor Power Supply Low - AutoCodes.com — P1020 BMW Code - Valvetronic Eccentric Shaft Sensor Power Supply Low

What does this mean?

What are the Possible Causes of the DTC P1020 BMW?

Reluctor on Valvetronic Eccentric Shaft Sensor poor installation
Faulty Valvetronic Eccentric Shaft Sensor
Valvetronic Eccentric Shaft Sensor harness is open or shorted
Valvetronic Eccentric Shaft Sensor circuit poor electrical connection

How to Fix the DTC P1020 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 P1020 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.

Need more information about the P1020 BMW code?

Need more information on how to fix the P1020 BMW code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1020 BMW code diagnosed by a professional: Find a repair shop in your area

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 P1020 BMW Code

1. What are the common symptoms of OBDII code P1020 in a BMW related to the Valvetronic Eccentric Shaft Sensor Power Supply Low?

The common symptoms include rough idling, loss of power, engine misfires, and poor fuel efficiency.

2. What can cause the Valvetronic Eccentric Shaft Sensor Power Supply Low fault code P1020 in a BMW?

Possible causes include a faulty eccentric shaft sensor, damaged wiring or connectors, low voltage supply to the sensor, or a problem with the engine control module.

3. How can I diagnose the Valvetronic Eccentric Shaft Sensor Power Supply Low issue in my BMW?

Diagnosis usually involves using a diagnostic scanner to read the fault code, checking the sensor and its wiring for visible damage, and testing the voltage supply to the sensor.

4. Is it safe to continue driving my BMW with the P1020 fault code related to the Valvetronic system?

It is not recommended to drive the vehicle with this fault code present, as it can lead to further engine damage and potentially unsafe driving conditions.

5. Can I repair the Valvetronic Eccentric Shaft Sensor Power Supply Low issue in my BMW myself?

While some DIY enthusiasts may be able to replace the sensor or repair wiring issues, it is recommended to consult a professional mechanic for proper diagnosis and repair of this complex system.

6. How much does it typically cost to fix the Valvetronic Eccentric Shaft Sensor Power Supply Low fault in a BMW?

The cost of repair can vary depending on the exact cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

7. Are there any preventive maintenance tips to avoid the P1020 fault code in the future?

Regularly servicing your BMW, including oil changes and inspections, can help prevent issues with the Valvetronic system. Additionally, addressing any engine performance issues promptly can help avoid more serious problems.

8. What are the long-term effects of ignoring the Valvetronic Eccentric Shaft Sensor Power Supply Low fault code?

Ignoring this fault code can lead to increased engine wear, reduced fuel efficiency, and potential damage to other engine components over time.

9. Can a low battery voltage trigger the Valvetronic Eccentric Shaft Sensor Power Supply Low fault code in a BMW?

Yes, a low battery voltage or alternator issues can affect the power supply to various sensors in the vehicle, including the eccentric shaft sensor, triggering the P1020 fault code.

10. Is the Valvetronic Eccentric Shaft Sensor Power Supply Low fault common in certain BMW models?

While this fault can occur in various BMW models equipped with Valvetronic technology, it may be more prevalent in specific series or production years due to common design or component issues.