AutoCodes – Mercury – P2027 Mercury

P2027 Mercury Code - Evaporative Emissions Fuel Vapor Temperature Sensor Circuit High Voltage

Quick Answer

The Powertrain Control Module (PCM) monitors the Natural Vacuum Leak Detection (NVLD) module input for expected NVLD ambient temperature sensor values. Common causes include Faulty Natural Vacuum Leak Detection (NVLD) module, Natural Vacuum Leak Detection (NVLD) module harness is open or shorted, Natural Vacuum Leak Detection (NVLD) module 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: P2027 Mercury indicates Evaporative Emissions Fuel Vapor Temperature Sensor Circuit High Voltage.
Common causes: Common causes include Faulty Natural Vacuum Leak Detection (NVLD) module, Natural Vacuum Leak Detection (NVLD) module harness is open or shorted, Natural Vacuum Leak Detection (NVLD) module 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 1,327

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 Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
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Code P2027 Mercury Description

The Powertrain Control Module (PCM) monitors the Natural Vacuum Leak Detection (NVLD) module input for expected NVLD ambient temperature sensor values. The P2027 code sets when the input is outside a calibrated set of limits.

OBDII Code P2027 Mercury - Evaporative Emissions Fuel Vapor Temperature Sensor Circuit High Voltage - AutoCodes.com — P2027 Mercury Code - Evaporative Emissions Fuel Vapor Temperature Sensor Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P2027 Mercury?

Faulty Natural Vacuum Leak Detection (NVLD) module
Natural Vacuum Leak Detection (NVLD) module harness is open or shorted
Natural Vacuum Leak Detection (NVLD) module circuit poor electrical connection
Faulty Powertrain Control Module (PCM)

How to Fix the DTC P2027 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 P2027 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.