AutoCodes – Mercury – P0C27 Mercury

P0C27 Mercury Code - Electric Transmission Fluid Pump Motor Control Module

Quick Answer

The Electronic Transmission Fluid Auxiliary Pump is used to keep the transmission engaged when the engine is stopped and the transmission is in drive. Common causes include Faulty Electronic Transmission Fluid Auxiliary Pump, Electronic Transmission Fluid Auxiliary Pump harness is open or shorted, Electronic Transmission Fluid Auxiliary Pump 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: P0C27 Mercury indicates Electric Transmission Fluid Pump Motor Control Module.
Common causes: Common causes include Faulty Electronic Transmission Fluid Auxiliary Pump, Electronic Transmission Fluid Auxiliary Pump harness is open or shorted, Electronic Transmission Fluid Auxiliary Pump 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 858

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 Jan 21, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P0C27 Mercury Description

The Electronic Transmission Fluid Auxiliary Pump is used to keep the transmission engaged when the engine is stopped and the transmission is in drive. The Transmission Control Module (TCM) monitors the Electronic Transmission Fluid Auxiliary Pump Control Circuit. The TCM sets the OBDII code when the Electronic Transmission Fluid Auxiliary Pump Control Circuit signal is out of factory specifications.

OBDII Code P0C27 Mercury - Electric Transmission Fluid Pump Motor Control Module - AutoCodes.com — P0C27 Mercury Code - Electric Transmission Fluid Pump Motor Control Module

What does this mean?

What are the Possible Causes of the DTC P0C27 Mercury?

Faulty Electronic Transmission Fluid Auxiliary Pump
Electronic Transmission Fluid Auxiliary Pump harness is open or shorted
Electronic Transmission Fluid Auxiliary Pump circuit poor electrical connection

How to Fix the DTC P0C27 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 P0C27 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.