← View Generic P0591 Guide Severity: Medium

🚗 Vehicle-Specific Guide

This guide is customized for your 2018 BMW X5

P0591: P0591: Idle Air Control (IAC) Motor Circuit Malfunction

on 2018 BMW X5

Fix Cost

$100 - $300

Parts & Labor

Difficulty

3/5

1-2 hours

DIY Possible?

✅ Yes

Save money

Your Vehicle

2018 BMW

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Important for 2018 BMW X5 Owners

Before starting repairs, verify which engine your 2018 BMW X5 has. Check your VIN or engine code to ensure you order the correct parts.

📖 What Does P0591 Mean on 2018 BMW X5?

The idle air control (IAC) motor circuit has malfunctioned, causing the engine to idle rough or stall. This code is often accompanied by other symptoms such as a rough idle, stalling, or hesitation when accelerating.

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Symptoms

• Rough idle
• stalling
• hesitation when accelerating
• engine light on

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Common Causes

• Faulty idle air control (IAC) motor
• dirty or clogged IAC motor
• faulty throttle position sensor
• vacuum leaks

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How to Fix P0591 on 2018 BMW X5

1. Check and clean the IAC motor and its associated vacuum hoses. 2. Replace the IAC motor if it's faulty. 3. Check and replace the throttle position sensor if it's faulty. 4. Check for vacuum leaks and repair as necessary.

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Parts for 2018 BMW X5

Idle Air Control (IAC) motor Shop ↗ vacuum hoses Shop ↗

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Related Diagnostic Codes

Other codes that may appear with P0591

P0589 Sequential Code

💡 Why These Codes Are Related:

• Similar Issues: Same root cause or component failure
• Related Problems: Often occur together due to system interactions
• Sequential Codes: Progressive failure stages or multiple sensors
• Same System: Components within the same automotive system