P050D: Cold Start Rough Idle
2 vehicles · 1 makes · $3,000-$7,500 repair
Most Reported On
P050D is an OBD-II diagnostic trouble code meaning “Cold Start Rough Idle.” A generic OBD-II powertrain code set when the engine control module detects an unstable or rough idle during a cold start, meaning while coolant temperature is still below the module's cold-start threshold. The module evaluates idle quality and crankshaft speed stability and sets P050D when the variation falls outside the programmed limits. Drivers typically feel shaking or vibration and see idle speed wander for the first few minutes after a cold start, then the engine smooths out once warm. It is an emissions-relevant driveability code rather than an immediate safety issue. This code is most commonly reported on 2016-2019 Chevrolet Corvette (Stingray, Stingray Z51, Grand Sport, Z06), and 2018-2019 Chevrolet Equinox (LS, LT, Premier), with repair costs ranging from $3,000 to $7,500.
Common Causes
Typical Repair Cost
Based on 2 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
This is a powertrain code, so a basic OBD-II reader can read it. These read P050D.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple code reader for engine (P) codes on many compatible OBD-II vehicles. It does not support every vehicle or hybrid/EV application, and it does NOT read body, chassis or network codes; confirm exact-vehicle compatibility before buying.
- Read & clear engine (P) codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth scanner with a companion app that reads beyond the engine module — ABS, SRS and transmission — plus manufacturer-specific codes on many vehicles.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X V3.0 Elite OBD-II Scanner
by LAUNCH
Handheld scanner covering the four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level tablet with all-system coverage and bi-directional control, so you can command a module rather than only read it.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
What you can do yourself, and what needs a shop
Reading the code, clearing it, and watching whether it returns is a driveway job with the right scanner. These steps are not:
- Module programming or software updates — needs the manufacturer software or a J2534 pass-through with a paid subscription.
- Replacing a control module — most are VIN-programmed and immobilizer-registered, so a new one does nothing until it is coded to your car.
- Airbag/SRS component work — a stored fault can deploy a live device.
If the vehicle is still under warranty, check for an open recall or technical service bulletin before buying anything — the repair may already be covered.
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FAQ
What does P050D mean?
P050D stands for "Cold Start Rough Idle." A generic OBD-II powertrain code set when the engine control module detects an unstable or rough idle during a cold start, meaning while coolant temperature is still below the module's cold-start threshold. The module evaluates idle quality and crankshaft speed stability and sets P050D when the variation falls outside the programmed limits. Drivers typically feel shaking or vibration and see idle speed wander for the first few minutes after a cold start, then the engine smooths out once warm. It is an emissions-relevant driveability code rather than an immediate safety issue.
What are the most common causes of P050D?
The most common causes of P050D are: Vacuum or intake air leak, Dirty, leaking, or failing fuel injector, Low fuel pressure or a weak fuel pump, Faulty engine coolant temperature sensor giving a wrong cold reading, Contaminated or failing mass airflow sensor, Carbon buildup on the throttle body or intake valves, Worn spark plugs or weak ignition coils. The specific cause varies by vehicle.
How much does it cost to fix P050D?
Repair costs for P050D range from $3,000 to $7,500, depending on the vehicle and root cause.
Which vehicles are affected by P050D?
Au7o has documented P050D across 2 vehicle models from 1 manufacturers: Chevrolet.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.