AutoCodes – Mercedes-Benz – P2091 Mercedes-Benz

P2091 Mercedes-Benz Code - 'B' Camshaft Position Actuator Control Circuit High Bank 1

Quick Answer

This fault code is stored in the Engine Control Module (ECM) when a malfunction is detected in the continuously variable valve timing system. Common causes include Faulty Continuously Variable Valve Timing Solenoid, Continuously Variable Valve Timing Solenoid harness is open or shorted, Continuously Variable Valve Timing Solenoid 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: P2091 Mercedes-Benz indicates 'B' Camshaft Position Actuator Control Circuit High Bank 1.
Common causes: Common causes include Faulty Continuously Variable Valve Timing Solenoid, Continuously Variable Valve Timing Solenoid harness is open or shorted, Continuously Variable Valve Timing Solenoid 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 7,840

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 Sep 08, 2019

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P2091 Mercedes-Benz Description

This fault code is stored in the Engine Control Module (ECM) when a malfunction is detected in the continuously variable valve timing system. Mechanical defects such as incorrect valve timing or low oil level/pressure can cause a fault code to be stored. Mechanical issues should be ruled out before carrying out an further diagnostic tests.

OBDII Code P2091 Mercedes-Benz - 'B' Camshaft Position Actuator Control Circuit High Bank 1 - AutoCodes.com — P2091 Mercedes-Benz Code - 'B' Camshaft Position Actuator Control Circuit High Bank 1

What does this mean?

What are the Possible Causes of the DTC P2091 Mercedes-Benz?

Faulty Continuously Variable Valve Timing Solenoid
Continuously Variable Valve Timing Solenoid harness is open or shorted
Continuously Variable Valve Timing Solenoid circuit poor electrical connection

How to Fix the DTC P2091 Mercedes-Benz?

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 does this mean?

Code Tech Notes

Mercedes Benz Code = 0065 (Right camshaft exhaust solenoid) has a short circuit to positive. (P2091)
Mercedes Benz Code = 0069 (Left camshaft exhaust solenoid) has a short circuit to positive. (P2091)

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2091 Mercedes-Benz 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 P2091 Mercedes-Benz code?

Need more information on how to fix the P2091 Mercedes-Benz code? Get Access to Factory Service Manuals

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 P2091 Mercedes-Benz Code

1. What does the OBDII code P2091 mean for a Mercedes-Benz?

P2091 refers to a high voltage issue in the 'B' camshaft position actuator control circuit on Bank 1, indicating a problem with the variable valve timing system.

2. What are the common symptoms of code P2091 on a Mercedes-Benz?

Symptoms may include poor engine performance, rough idling, reduced fuel efficiency, hesitation during acceleration, and the Check Engine Light illuminating.

3. What causes the P2091 code to appear on a Mercedes-Benz?

Common causes include a faulty camshaft position actuator, damaged wiring or connectors in the actuator circuit, a failing camshaft position sensor, or low engine oil levels.

4. Can low engine oil cause the P2091 code on a Mercedes-Benz?

Yes, insufficient or dirty engine oil can affect the camshaft actuator's performance and trigger the code.

5. How is the P2091 code diagnosed on a Mercedes-Benz?

A technician will use an OBDII scanner to confirm the code, inspect the wiring and connectors, check the camshaft actuator, and verify proper oil levels and quality.

6. Is it safe to drive a Mercedes-Benz with the P2091 code?

Driving with this code is not recommended, as it can lead to further engine issues, poor performance, and possible engine damage if not addressed.

7. What repairs are needed to fix the P2091 code on a Mercedes-Benz?

Repairs may include replacing the camshaft position actuator, repairing damaged wiring, replacing the camshaft position sensor, or performing an oil change.

8. How much does it typically cost to fix the P2091 code on a Mercedes-Benz?

Repair costs can vary but typically range from $200 to $600, depending on whether parts like the actuator or sensor need replacement.

9. Can a software update fix the P2091 code on a Mercedes-Benz?

In rare cases, a software update may resolve the issue if it's related to the engine control module (ECM). However, mechanical or electrical repairs are more commonly required.

10. How can I prevent the P2091 code from returning on my Mercedes-Benz?

Regular maintenance, including timely oil changes and using manufacturer-recommended oil, as well as inspecting wiring and sensors, can help prevent this code.