AutoCodes – Volkswagen – P1503 Volkswagen

P1503 Volkswagen Code - Load Signal From Alternator DF Terminal Implausible Signal

Quick Answer

P1503 Volkswagen indicates Load Signal From Alternator DF Terminal Implausible Signal. Common causes include Faulty Alternator, Alternator harness is open or shorted, Alternator 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: P1503 Volkswagen indicates Load Signal From Alternator DF Terminal Implausible Signal.
Common causes: Common causes include Faulty Alternator, Alternator harness is open or shorted, Alternator 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 24,982

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 Volkswagen Description

OBDII Code P1503 Volkswagen - Load Signal From Alternator DF Terminal Implausible Signal - AutoCodes.com — P1503 Volkswagen Code - Load Signal From Alternator DF Terminal Implausible Signal

What does this mean?

What are the Possible Causes of the DTC P1503 Volkswagen?

Faulty Alternator
Alternator harness is open or shorted
Alternator poor electrical connection

How to Fix the DTC P1503 Volkswagen?

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 Volkswagen 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.