AutoCodes – Mercury – P2091 Mercury

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

Quick Answer

The Variable Camshaft Timing (VCT) solenoid valve is an integral part of the VCT system. Common causes include Faulty Variable Camshaft Timing (VCT) solenoid Bank 1, Variable Camshaft Timing (VCT) solenoid Bank 1 harness is open or shorted, Variable Camshaft Timing (VCT) solenoid Bank 1 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 Mercury indicates 'B' Camshaft Position Actuator Control Circuit High Bank 1.
Common causes: Common causes include Faulty Variable Camshaft Timing (VCT) solenoid Bank 1, Variable Camshaft Timing (VCT) solenoid Bank 1 harness is open or shorted, Variable Camshaft Timing (VCT) solenoid Bank 1 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 1,648

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2091 Mercury Description

The Variable Camshaft Timing (VCT) solenoid valve is an integral part of the VCT system. The solenoid valve controls the flow of engine oil in the VCT actuator assembly. As the PCM controls the duty cycle of the solenoid valve, oil pressure/flow advances or retards the cam timing. Duty cycles near 0% or 100% represent rapid movement of the camshaft. Retaining a fixed camshaft position is accomplished by dithering (oscillating) the solenoid valve duty cycle.

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

What does this mean?

What are the Possible Causes of the DTC P2091 Mercury?

Faulty Variable Camshaft Timing (VCT) solenoid Bank 1
Variable Camshaft Timing (VCT) solenoid Bank 1 harness is open or shorted
Variable Camshaft Timing (VCT) solenoid Bank 1 circuit poor electrical connection

How to Fix the DTC P2091 Mercury?

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 P2091 Mercury 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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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 Mercury Code

1. What does the OBDII code P2091 mean for a Mercury vehicle?

P2091 indicates that the 'B' camshaft position actuator control circuit on Bank 1 is reporting a high voltage condition, suggesting an issue with the actuator or its wiring.

2. What are the symptoms of a P2091 code in a Mercury?

Common symptoms include poor engine performance, rough idling, reduced fuel efficiency, possible stalling, and an illuminated check engine light.

3. What causes the P2091 code in a Mercury?

Potential causes include a faulty camshaft position actuator, damaged wiring or connections in the actuator circuit, a failing PCM (Powertrain Control Module), or low engine oil levels.

4. Can low engine oil cause the P2091 code?

Yes, low or dirty engine oil can prevent the camshaft position actuator from functioning properly, leading to this code.

5. How can you diagnose the P2091 code on a Mercury?

Diagnose the code by using a scan tool to confirm the code, inspecting the actuator wiring and connectors for damage, checking the oil level and quality, and testing the camshaft position actuator.

6. Is it safe to drive with a P2091 code?

Driving with this code is not recommended, as it can lead to engine performance issues, potential damage to internal components, and unsafe driving conditions.

7. How do you fix a P2091 code on a Mercury?

Repairs may include replacing the camshaft position actuator, repairing damaged wiring, cleaning or replacing the oil, or reprogramming or replacing the PCM if necessary.

8. Can a P2091 code be caused by a bad PCM?

While rare, a failing or malfunctioning PCM can cause the P2091 code by not properly controlling the camshaft actuator.

9. What tools are needed to fix a P2091 code?

You may need an OBDII scan tool, a multimeter for electrical testing, basic hand tools, and possibly an oil filter wrench if an oil change is required.

10. Can a P2091 code clear itself after repairs?

The code may clear itself after fixing the issue, but in some cases, you may need to use an OBDII scan tool to erase the code manually.