Free API
Help
2020 HYUNDAI TUCSON
2.4L I4•AWD•AUTOMATIC•gas
1 active safety recall on this vehicle — view recalls
Founding sponsor spot is openYour name on every procedure for this vehicle, permanently.Sponsor — $99 →
Repairs0Labor970Torque3111Fluid16DTC3698Battery2Maintenance0Recalls1
P1505moderate severityPowertrain

IAC Valve Opening Coil Circuit Open

on 2020 Hyundai Tucson 2.4L I4 · AWD

What this code means

The PCM has detected an open circuit in the IAC valve opening coil. The idle air control valve uses separate coils for opening and closing; the opening coil circuit is not completing the electrical path.

Symptoms

  • Check Engine Light
  • Low idle speed
  • Engine stalling at idle
  • Rough idle
  • Engine dies when coming to a stop

Common causes

  • Broken wire in IAC opening coil circuit
  • Corroded IAC connector
  • Faulty IAC valve with open coil winding
  • PCM connector issue
  • Poor ground connection

Diagnostic steps

  1. Test IAC valve opening coil resistance with multimeter
  2. Inspect IAC connector for corrosion or loose pins
  3. Check wiring continuity from PCM to IAC opening coil
  4. Test PCM output to IAC opening coil
  5. Check ground circuit

Repair notes

Replace the IAC valve if the opening coil is internally open; repair wiring or connector if the external circuit is at fault.

🔌 Don't have a code reader?
Any of these will read and clear this code — pick by how deep you want to go.
Budget handheld~$40
ANCEL AD410 →
No-phone-needed handheld — reads, clears, live data, freeze frame.
✓ ANCEL official store
Serious DIY~$100
BlueDriver Pro →
Enhanced codes (ABS, airbag, TPMS) plus repair reports.
SHOP FAVORITE
Shop-grade tablet~$300
Autel MaxiCOM MK808S →
Bidirectional tests, service resets, all systems.
✓ Autel official store
Pro diagnostics$1,500+
Autel MaxiSys MS906 Pro →
Full-system pro platform — topology mapping, ECU coding, the works.
✓ Autel official store
As an Amazon Associate and Autel/ANCEL partner, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.

Other Powertrain codes on this vehicle

For shop owners
Diagnosing for customers?
Text them the estimate with photos and get approval in minutes with Auto Shop Base.
Talk to the ownerSee what's included
Built by a shop owner. Talk to Chris, not a sales rep.
🔌 Need this data in your app? It's all in the free API →
🔧 Built by master technician Chris Hackleman · Master Technician · 20+ years. Spot an error? Use the Help link above — a human reads every report.
Stuck on this repair? Take it to The Diag Desk — ask a master tech about this exact car → real human answer within 24h, never AI
Share:XRedditFBWhatsAppThreadsEmail
⚠ STILL BEHIND THE PAYWALL
The 2020 Hyundai Tucson repair data is incomplete because no one has sponsored it yet. For $99, we generate the full step-by-step procedures, then fact-check them with a second AI pass and your expert review. Your name on every procedure, permanently.
The same data would cost $169/mo from Mitchell1 or $30/year from ALLDATAdiy — and you'd be renting access, not freeing it. Sponsor once, free forever.
Sponsor the Hyundai Tucson — $99 →
Building an app?
Free API access to all this data — 10 requests/day, no card required.
Get an API key →
Run a shop?
A free website, SEO and Google reviews with your shop software. Auto Shop Base Professional, $250/mo, with our labor times on every estimate.
See what's included →