P050D

Cold Start Rough Idle

Q: Is it safe to drive with P050D?

Usually yes — the roughness is mostly a cold-start condition that clears as the engine warms. If it stalls repeatedly when cold, get it fixed before it strands you.

Q: Can I just clear P050D?

It returns on the next cold start until the underlying idle or mixture problem is corrected. Clearing only resets the light.

Idle / cold-start control Generic OBD-II High

What it means

P050D means the ECM detected an unusually rough or unstable idle during a cold start. On a cold engine the mixture and idle speed are more sensitive, so a vacuum leak, dirty throttle body, weak ignition, or a skewed sensor reading shows up as shaking or stumbling that typically smooths out once the engine warms up.

High

Can I keep driving? Usually drivable — the roughness is mostly during the first minutes after a cold start and smooths out as the engine warms, but it can stumble or stall cold until fixed.

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

Rough or unstable idle right after a cold start
Engine may shake, stumble, or briefly stall when cold
Idle smooths out as the engine warms up
Check-engine light on

Common causes

Most likely first

Vacuum or intake air leakLikely
Dirty throttle body or carboned intake valvesCommon
Failing ignition components (plugs, coils)Common
Leaking or clogged fuel injectors / low cold-start fuel pressureLess often
Faulty coolant-temp or MAF sensor skewing the cold fuel mixtureLess often

How to diagnose & fix

Work through it in order

Read freeze-frame data and confirm the code with a scan tool.
Check for vacuum/intake air leaks and clean the throttle body.
Inspect spark plugs and ignition coils for wear or misfire.
Verify cold-start fuel pressure and injector operation.
Test the coolant-temp and MAF sensors that set the cold mixture. Clear and re-test.

FAQ

Quick answers

Is it safe to drive with P050D?+

Usually yes — the roughness is mostly a cold-start condition that clears as the engine warms. If it stalls repeatedly when cold, get it fixed before it strands you.

Can I just clear P050D?+

It returns on the next cold start until the underlying idle or mixture problem is corrected. Clearing only resets the light.

Read & clear P050D 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