AutoCodes – Generic – U1451

U1451 Code - Invalid Or Missing Data For Anti-Theft Module Vehicle Immobilized

Quick Answer

The Diagnostic Trouble Code (DTC) will set when the Powertrain Control Module (PCM) received a signal on the Standard Corporate Protocol (SCP) bus that indicated Invalid or Missing Data for the Anti-Theft Module. Common causes include Faulty Anti-Theft Module, Anti-Theft Module harness is open or shorted, Anti-Theft 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: U1451 indicates Invalid Or Missing Data For Anti-Theft Module Vehicle Immobilized.
Common causes: Common causes include Faulty Anti-Theft Module, Anti-Theft Module harness is open or shorted, Anti-Theft 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 10,064

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 May 24, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code U1451 Description

OBDII Code U1451 - Invalid Or Missing Data For Anti-Theft Module Vehicle Immobilized - AutoCodes.com — U1451 Code - Invalid Or Missing Data For Anti-Theft Module Vehicle Immobilized

What does this mean?

What are the Possible Causes of the DTC U1451?

Faulty Anti-Theft Module
Anti-Theft Module harness is open or shorted
Anti-Theft Module circuit poor electrical connection
Faulty Powertrain Control Module (PCM)

How to Fix the DTC U1451?

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 U1451 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.

Need more information about the U1451 code?

Need more information on how to fix the U1451 code? Get Access to Factory Service Manuals

Need Help with the Code?

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Information for Specific Makes

U1451 Ford — Invalid Or Missing Data For Anti-Theft Module Vehicle Immobilized
U1451 Lincoln — Invalid Or Missing Data For Anti-Theft Module Vehicle Immobilized
U1451 Mercury — Invalid Or Missing Data For Anti-Theft Module Vehicle Immobilized

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.