AutoCodes – Ford – P1644 Ford

P1644 Ford Code - Fuel Pump Speed Control Circuit Malfunction

Quick Answer

P1644 Ford indicates Fuel Pump Speed Control Circuit Malfunction. Common causes include Faulty Fuel Pump Speed Control, Fuel Pump Speed Control harness is open or shorted, Fuel Pump Speed Control 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: P1644 Ford indicates Fuel Pump Speed Control Circuit Malfunction.
Common causes: Common causes include Faulty Fuel Pump Speed Control, Fuel Pump Speed Control harness is open or shorted, Fuel Pump Speed Control 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 9,079

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 05, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P1644 Ford Description

OBDII Code P1644 Ford - Fuel Pump Speed Control Circuit Malfunction - AutoCodes.com — P1644 Ford Code - Fuel Pump Speed Control Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC P1644 Ford?

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

How to Fix the DTC P1644 Ford?

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 P1644 Ford 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.