P050A

Cold Start Idle Control System Performance

Q: Is it safe to drive with P050A?

Usually yes once the engine warms up, but cold-start stalling can be inconvenient or unsafe in traffic, so have it repaired.

Q: Can I just clear P050A?

It will return on the next cold start unless the IAC valve, throttle body deposits, or vacuum leak is addressed.

Idle air control Generic OBD-II High

What it means

P050A means the engine's idle-air control isn't holding the expected idle speed during a cold start — the ECM commands a higher warm-up idle, but the actual RPM doesn't match. The engine still starts, but you may get rough idle or stalling until it warms up. A dirty throttle body or idle air control valve is a common cause.

High

Can I keep driving? Usually drivable — the main symptom is rough idle or stalling right after a cold start; once warmed up it typically runs normally, but get it checked.

Real-world scan data

Seen in

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on
Rough or unstable idle when the engine is cold
Stalling or near-stall right after a cold start
Slow to settle to normal idle speed when cold

Common causes

Most likely first

Faulty idle air control (IAC) valveLikely
Carbon buildup in the throttle body or idle air passagesCommon
Vacuum leak affecting idle air flowCommon
Wiring or connector fault at the IAC valveLess often
Rarely, a failed ECMLess often

How to diagnose & fix

Work through it in order

Read freeze-frame data to confirm the fault sets during cold start.
Clean the throttle body, idle air passages, and IAC valve of carbon.
Check for vacuum leaks around the intake with the engine cold.
Test the IAC valve and its wiring; replace the valve if it doesn't respond, then clear and re-test.

FAQ

Quick answers

Is it safe to drive with P050A?+

Usually yes once the engine warms up, but cold-start stalling can be inconvenient or unsafe in traffic, so have it repaired.

Can I just clear P050A?+

It will return on the next cold start unless the IAC valve, throttle body deposits, or vacuum leak is addressed.

Read & clear P050A yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX