P0506
Medium SeverityIdle Air Control System RPM Lower Than Expected
Engine System
P0506 — Instant Answer
Idle Air Control System RPM Lower Than Expected
Severity: MEDIUM SEVERITY
Meaning: Idle speed is too low. The IAC is trying to raise it but cannot.
Safe to drive? Usually yes with caution, but confirm root cause before long trips.
Estimated repair cost: $5 - $80
Most common causes:
- 1. Carbon buildup in throttle body/IAC (35-45% of cases)
- 2. Vacuum leak (10-25% of cases)
- 3. Failing IAC valve (10-25% of cases)
Common Causes
How to Diagnose P0506
- 1Clean throttle body and IAC
- 2Check for vacuum leaks
- 3Replace IAC valve if cleaning fails
OEM Procedures for P0506
P0506 affects the Engine Control Module. Found 146 OEM service manual procedures.
12 90 120 Removing and installing/replacing control unit bracket (Cooper 4-door hatchback, Cooper 2-door hatchback, 2020-2023) - Replacement: Remount DME control unit and the integrated supply module (PDM)
12 90 120 Removing and installing/replacing control unit bracket (Cooper 4-door hatchback, Cooper 2-door hatchback, 2020-2023) - Replacement: Remount DME control unit and the integrated supply module (PDM)
12 90 120 Removing and installing/replacing control unit bracket (Cooper 4-door hatchback, Cooper 2-door hatchback, 2020-2023) - Replacement: Remount DME control unit and the integrated supply module (PDM)
12 90 120 Removing and installing/replacing control unit bracket (Cooper 4-door hatchback, Cooper 2-door hatchback, 2020-2023) - Replacement: Remount DME control unit and the integrated supply module (PDM)
12 90 120 Removing and installing/replacing control unit bracket (Cooper 4-door hatchback, Cooper 2-door hatchback, 2020-2023) - Replacement: Remount DME control unit and the integrated supply module (PDM)
12 90 120 Removing and installing/replacing control unit bracket (Cooper 4-door hatchback, Cooper 2-door hatchback, 2020-2023) - Replacement: Remount DME control unit and the integrated supply module (PDM)
12 90 120 Removing and installing/replacing control unit bracket (Cooper 4-door hatchback, Cooper 2-door hatchback, 2020-2023) - Replacement: Remount DME control unit and the integrated supply module (PDM)
12 90 120 Removing and installing/replacing control unit bracket (Cooper 4-door hatchback, Cooper 2-door hatchback, 2020-2023) - Replacement: Remount DME control unit and the integrated supply module (PDM)
Showing 8 of 146 procedures
OEM Diagnostic Flowchart
Scroll to load technician if/then branches.
Read live data and freeze frame for P0506 to pinpoint the cause before buying parts.
TopScan
$51.27
DIYers who want phone-based scanning
View on TOPDON
ArtiLink600
$99
DIYers working on ABS/airbag systems
View on TOPDONGot a repair estimate for P0506? Check if the quote is fair before ordering parts.
Parts & Tools for This Job
Common parts shoppers buy for P0506 Idle Air Control System RPM Lower Than Expected.
Oxygen Sensor
Shop Amazon→
Spark Plugs
Shop Amazon→
Ignition Coils
Shop Amazon→
Mass Air Flow Sensor
Shop Amazon→
Fuel Injectors
Shop Amazon→
Engine Oil
Shop Amazon→
As an Amazon Associate, AllOEMManuals earns from qualifying purchases. Prices and availability may vary.
Turn This Into a Confident Next Step
Verify the likely fault first, then compare a quote before you approve expensive work.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
View factory recommended tools
OBD2 scanner
Read codes and freeze-frame data before you guess at the fault.
Most diagnostic jobs start with a scan tool and a verified code path.
Check SpecificationsBattery tester
Check cranking and charging health before replacing expensive parts.
A weak battery can mimic alternator or starter problems.
Check SpecificationsMultimeter kit
Confirm voltage, continuity, and sensor power with one simple kit.
A meter is the cheapest way to rule out a bad circuit fast.
Check SpecificationsRelated Resources
Repair guides, symptom pages, and wiring diagrams related to P0506.
OEM Manual Evidence
Browse →Idle Control DTCS — 2013 Acura MDX 3.7L Eng VIN 2 Service Manual ~ LEMON Manuals LEMON Manuals: Repair Knowledge Reimagined Home >> Acura >...
Idle Control DTCS — 2013 Acura MDX 3.7L Eng VIN YD2 Service Manual ~ LEMON Manuals LEMON Manuals: Repair Knowledge Reimagined Home >> Acura...
Engine Control System - Advanced DTCS — 2013 Acura RDX 3.5L Eng VIN 3 Service Manual ~ LEMON Manuals LEMON Manuals: Repair Knowledge Reimag...
Engine Control System DTCS — 2013 Acura RDX 3.5L Eng VIN 3 Service Manual ~ LEMON Manuals LEMON Manuals: Repair Knowledge Reimagined Home >...
Related Symptoms
Browse →Exact Vehicle Hubs
Browse →Open the exact vehicle hub grounded by OEM manual evidence related to P0506.
Open the exact vehicle hub grounded by OEM manual evidence related to P0506.
Open the exact vehicle hub grounded by OEM manual evidence related to P0506.
Related Codes
Frequently Asked Questions
- Why does my car stall at red lights?
- Low idle speed from a dirty IAC or throttle body cannot keep the engine running when you take your foot off the gas.
- Can a dirty throttle body cause P0506?
- Absolutely — carbon buildup restricts airflow at idle. Cleaning it is the first thing to try.
Get the Complete Maintenance Schedule for P0506 drivers
Oil, filters, belts, brakes, and fluid intervals sent to your inbox. Unsubscribe anytime.
Not sure you want to DIY? Compare local shop pricing first.
Author & Review
Published by AllOEMManuals, founded by Lyndon Bedford, an automotive technician with 20 years of experience. He owned and operated a mechanic shop in Hurst, Texas from 2014 to 2022 and continues hands-on repair work.
Content may combine manual references, general repair templates, and AI-assisted drafting. Confirm the source, vehicle configuration, and applicability before working. Report corrections through our contact page.
Last updated: 2026-10-30