AutoCodes – Cadillac – P1503 Cadillac

P1503 Cadillac Code - Theft Deterrent Fuel Enable Signal Not Correct

Quick Answer

With the engine cranking, the Powertrain Control Module (PCM) received a frequency code that did not match the code it received from the theft deterrent module. Common causes include Faulty Theft Deterrent System, Theft Deterrent System program. 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: P1503 Cadillac indicates Theft Deterrent Fuel Enable Signal Not Correct.
Common causes: Common causes include Faulty Theft Deterrent System, Theft Deterrent System program.
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 5,173

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 Aug 25, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P1503 Cadillac Description

With the engine cranking, the Powertrain Control Module (PCM) received a frequency code that did not match the code it received from the theft deterrent module.

OBDII Code P1503 Cadillac - Theft Deterrent Fuel Enable Signal Not Correct - AutoCodes.com — P1503 Cadillac Code - Theft Deterrent Fuel Enable Signal Not Correct

What does this mean?

What are the Possible Causes of the DTC P1503 Cadillac?

Faulty Theft Deterrent System
Theft Deterrent System program

How to Fix the DTC P1503 Cadillac?

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 P1503 Cadillac 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.