AutoCodes – Lincoln – P1231 Lincoln

P1231 Lincoln Code - High Speed Fuel Pump Relay Activated

Quick Answer

The Engine Control Module (ECM) energized the high speed fuel pump and detected no current flow on the circuit. Common causes include Faulty High Speed Fuel Pump, High Speed Fuel Pump harness is open or shorted, High Speed Fuel 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: P1231 Lincoln indicates High Speed Fuel Pump Relay Activated.
Common causes: Common causes include Faulty High Speed Fuel Pump, High Speed Fuel Pump harness is open or shorted, High Speed Fuel 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 1,256

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 Jul 20, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P1231 Lincoln Description

The Engine Control Module (ECM) energized the high speed fuel pump and detected no current flow on the circuit.

OBDII Code P1231 Lincoln - High Speed Fuel Pump Relay Activated - AutoCodes.com — P1231 Lincoln Code - High Speed Fuel Pump Relay Activated

What does this mean?

What are the Possible Causes of the DTC P1231 Lincoln?

Faulty High Speed Fuel Pump
High Speed Fuel Pump harness is open or shorted
High Speed Fuel Pump circuit poor electrical connection

How to Fix the DTC P1231 Lincoln?

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 P1231 Lincoln 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.