AutoCodes – Volkswagen – P1518 Volkswagen

P1518 Volkswagen Code - Main Relay Circuit Short to B+

Quick Answer

P1518 Volkswagen indicates Main Relay Circuit Short to B+. Common causes include Faulty Main Relay, Main Relay harness is open or shorted, Main Relay 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: P1518 Volkswagen indicates Main Relay Circuit Short to B+.
Common causes: Common causes include Faulty Main Relay, Main Relay harness is open or shorted, Main Relay 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 4,681

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 26, 2019

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P1518 Volkswagen Description

OBDII Code P1518 Volkswagen - Main Relay Circuit Short to B+ - AutoCodes.com — P1518 Volkswagen Code - Main Relay Circuit Short to B+

What does this mean?

What are the Possible Causes of the DTC P1518 Volkswagen?

Faulty Main Relay
Main Relay harness is open or shorted
Main Relay circuit poor electrical connection

How to Fix the DTC P1518 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 P1518 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.